2616bbb16d
Metadata potentially is more precise than any heuristics we use, so it makes sense to use first metadata info if it is available. However it makes sense to examine it against other strong heuristics like unreachable one. If edge coming to unreachable block has higher probability then it is expected by unreachable heuristic then we use heuristic and remaining probability is distributed among other reachable blocks equally. An example where metadata might be more strong then unreachable heuristic is as follows: it is possible that there are two branches and for the branch A metadata says that its probability is (0, 2^25). For the branch B the probability is (1, 2^25). So the expectation is that first edge of B is hotter than first edge of A because first edge of A did not executed at least once. If first edge of A points to the unreachable block then using the unreachable heuristics we'll set the probability for A to (1, 2^20) and now edge of A becomes hotter than edge of B. This is unexpected behavior. This fixed the biggest part of https://bugs.llvm.org/show_bug.cgi?id=32214 Reviewers: sanjoy, junbuml, vsk, chandlerc Reviewed By: chandlerc Subscribers: llvm-commits, reames, davidxl Differential Revision: https://reviews.llvm.org/D30631 llvm-svn: 300440
600 lines
19 KiB
LLVM
600 lines
19 KiB
LLVM
; RUN: opt < %s -analyze -branch-prob | FileCheck %s
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; RUN: opt < %s -analyze -lazy-branch-prob | FileCheck %s
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; RUN: opt < %s -passes='print<branch-prob>' -disable-output 2>&1 | FileCheck %s
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define i32 @test1(i32 %i, i32* %a) {
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; CHECK: Printing analysis {{.*}} for function 'test1'
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entry:
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br label %body
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; CHECK: edge entry -> body probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
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body:
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%iv = phi i32 [ 0, %entry ], [ %next, %body ]
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%base = phi i32 [ 0, %entry ], [ %sum, %body ]
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%arrayidx = getelementptr inbounds i32, i32* %a, i32 %iv
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%0 = load i32, i32* %arrayidx
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%sum = add nsw i32 %0, %base
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%next = add i32 %iv, 1
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%exitcond = icmp eq i32 %next, %i
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br i1 %exitcond, label %exit, label %body
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; CHECK: edge body -> exit probability is 0x04000000 / 0x80000000 = 3.12%
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; CHECK: edge body -> body probability is 0x7c000000 / 0x80000000 = 96.88% [HOT edge]
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exit:
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ret i32 %sum
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}
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define i32 @test2(i32 %i, i32 %a, i32 %b) {
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; CHECK: Printing analysis {{.*}} for function 'test2'
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entry:
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%cond = icmp ult i32 %i, 42
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br i1 %cond, label %then, label %else, !prof !0
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; CHECK: edge entry -> then probability is 0x78787878 / 0x80000000 = 94.12% [HOT edge]
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; CHECK: edge entry -> else probability is 0x07878788 / 0x80000000 = 5.88%
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then:
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br label %exit
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; CHECK: edge then -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
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else:
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br label %exit
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; CHECK: edge else -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
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exit:
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%result = phi i32 [ %a, %then ], [ %b, %else ]
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ret i32 %result
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}
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!0 = !{!"branch_weights", i32 64, i32 4}
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define i32 @test3(i32 %i, i32 %a, i32 %b, i32 %c, i32 %d, i32 %e) {
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; CHECK: Printing analysis {{.*}} for function 'test3'
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entry:
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switch i32 %i, label %case_a [ i32 1, label %case_b
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i32 2, label %case_c
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i32 3, label %case_d
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i32 4, label %case_e ], !prof !1
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; CHECK: edge entry -> case_a probability is 0x06666666 / 0x80000000 = 5.00%
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; CHECK: edge entry -> case_b probability is 0x06666666 / 0x80000000 = 5.00%
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; CHECK: edge entry -> case_c probability is 0x66666666 / 0x80000000 = 80.00%
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; CHECK: edge entry -> case_d probability is 0x06666666 / 0x80000000 = 5.00%
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; CHECK: edge entry -> case_e probability is 0x06666666 / 0x80000000 = 5.00%
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case_a:
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br label %exit
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; CHECK: edge case_a -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
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case_b:
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br label %exit
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; CHECK: edge case_b -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
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case_c:
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br label %exit
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; CHECK: edge case_c -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
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case_d:
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br label %exit
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; CHECK: edge case_d -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
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case_e:
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br label %exit
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; CHECK: edge case_e -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
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exit:
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%result = phi i32 [ %a, %case_a ],
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[ %b, %case_b ],
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[ %c, %case_c ],
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[ %d, %case_d ],
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[ %e, %case_e ]
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ret i32 %result
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}
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!1 = !{!"branch_weights", i32 4, i32 4, i32 64, i32 4, i32 4}
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define i32 @test4(i32 %x) nounwind uwtable readnone ssp {
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; CHECK: Printing analysis {{.*}} for function 'test4'
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entry:
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%conv = sext i32 %x to i64
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switch i64 %conv, label %return [
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i64 0, label %sw.bb
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i64 1, label %sw.bb
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i64 2, label %sw.bb
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i64 5, label %sw.bb1
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], !prof !2
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; CHECK: edge entry -> return probability is 0x0a8a8a8b / 0x80000000 = 8.24%
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; CHECK: edge entry -> sw.bb probability is 0x15151515 / 0x80000000 = 16.47%
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; CHECK: edge entry -> sw.bb1 probability is 0x60606060 / 0x80000000 = 75.29%
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sw.bb:
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br label %return
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sw.bb1:
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br label %return
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return:
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%retval.0 = phi i32 [ 5, %sw.bb1 ], [ 1, %sw.bb ], [ 0, %entry ]
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ret i32 %retval.0
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}
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!2 = !{!"branch_weights", i32 7, i32 6, i32 4, i32 4, i32 64}
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declare void @coldfunc() cold
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define i32 @test5(i32 %a, i32 %b, i1 %flag) {
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; CHECK: Printing analysis {{.*}} for function 'test5'
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entry:
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br i1 %flag, label %then, label %else
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; CHECK: edge entry -> then probability is 0x07878788 / 0x80000000 = 5.88%
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; CHECK: edge entry -> else probability is 0x78787878 / 0x80000000 = 94.12% [HOT edge]
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then:
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call void @coldfunc()
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br label %exit
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; CHECK: edge then -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
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else:
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br label %exit
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; CHECK: edge else -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
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exit:
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%result = phi i32 [ %a, %then ], [ %b, %else ]
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ret i32 %result
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}
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declare i32 @regular_function(i32 %i)
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define i32 @test_cold_call_sites_with_prof(i32 %a, i32 %b, i1 %flag, i1 %flag2) {
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; CHECK: Printing analysis {{.*}} for function 'test_cold_call_sites_with_prof'
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entry:
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br i1 %flag, label %then, label %else
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; CHECK: edge entry -> then probability is 0x07878788 / 0x80000000 = 5.88%
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; CHECK: edge entry -> else probability is 0x78787878 / 0x80000000 = 94.12% [HOT edge]
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then:
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br i1 %flag2, label %then2, label %else2, !prof !3
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; CHECK: edge then -> then2 probability is 0x7ebb907a / 0x80000000 = 99.01% [HOT edge]
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; CHECK: edge then -> else2 probability is 0x01446f86 / 0x80000000 = 0.99%
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then2:
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br label %join
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; CHECK: edge then2 -> join probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
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else2:
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br label %join
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; CHECK: edge else2 -> join probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
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join:
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%joinresult = phi i32 [ %a, %then2 ], [ %b, %else2 ]
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call void @coldfunc()
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br label %exit
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; CHECK: edge join -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
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else:
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br label %exit
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; CHECK: edge else -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
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exit:
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%result = phi i32 [ %joinresult, %join ], [ %b, %else ]
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ret i32 %result
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}
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!3 = !{!"branch_weights", i32 100, i32 1}
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define i32 @test_cold_call_sites(i32* %a) {
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; Test that edges to blocks post-dominated by cold call sites
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; are marked as not expected to be taken.
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; TODO(dnovillo) The calls to regular_function should not be merged, but
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; they are currently being merged. Convert this into a code generation test
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; after that is fixed.
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; CHECK: Printing analysis {{.*}} for function 'test_cold_call_sites'
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; CHECK: edge entry -> then probability is 0x07878788 / 0x80000000 = 5.88%
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; CHECK: edge entry -> else probability is 0x78787878 / 0x80000000 = 94.12% [HOT edge]
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entry:
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%gep1 = getelementptr i32, i32* %a, i32 1
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%val1 = load i32, i32* %gep1
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%cond1 = icmp ugt i32 %val1, 1
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br i1 %cond1, label %then, label %else
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then:
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; This function is not declared cold, but this call site is.
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%val4 = call i32 @regular_function(i32 %val1) cold
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br label %exit
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else:
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%gep2 = getelementptr i32, i32* %a, i32 2
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%val2 = load i32, i32* %gep2
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%val3 = call i32 @regular_function(i32 %val2)
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br label %exit
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exit:
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%ret = phi i32 [ %val4, %then ], [ %val3, %else ]
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ret i32 %ret
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}
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; CHECK-LABEL: test_invoke_code_callsite1
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define i32 @test_invoke_code_callsite1(i1 %c) personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
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entry:
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br i1 %c, label %if.then, label %if.end
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; Edge "entry->if.end" should have higher probability based on the cold call
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; heuristic which treat %if.then as a cold block because the normal destination
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; of the invoke instruction in %if.then is post-dominated by ColdFunc().
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; CHECK: edge entry -> if.then probability is 0x07878788 / 0x80000000 = 5.88%
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; CHECK: edge entry -> if.end probability is 0x78787878 / 0x80000000 = 94.12% [HOT edge]
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if.then:
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invoke i32 @InvokeCall()
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to label %invoke.cont unwind label %lpad
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; CHECK: edge if.then -> invoke.cont probability is 0x7ffff800 / 0x80000000 = 100.00% [HOT edge]
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; CHECK: edge if.then -> lpad probability is 0x00000800 / 0x80000000 = 0.00%
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invoke.cont:
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call void @ColdFunc() #0
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br label %if.end
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lpad:
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%ll = landingpad { i8*, i32 }
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cleanup
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br label %if.end
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if.end:
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ret i32 0
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}
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; CHECK-LABEL: test_invoke_code_callsite2
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define i32 @test_invoke_code_callsite2(i1 %c) personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
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entry:
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br i1 %c, label %if.then, label %if.end
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; CHECK: edge entry -> if.then probability is 0x40000000 / 0x80000000 = 50.00%
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; CHECK: edge entry -> if.end probability is 0x40000000 / 0x80000000 = 50.00%
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if.then:
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invoke i32 @InvokeCall()
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to label %invoke.cont unwind label %lpad
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; The cold call heuristic should not kick in when the cold callsite is in EH path.
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; CHECK: edge if.then -> invoke.cont probability is 0x7ffff800 / 0x80000000 = 100.00% [HOT edge]
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; CHECK: edge if.then -> lpad probability is 0x00000800 / 0x80000000 = 0.00%
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invoke.cont:
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br label %if.end
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lpad:
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%ll = landingpad { i8*, i32 }
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cleanup
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call void @ColdFunc() #0
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br label %if.end
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if.end:
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ret i32 0
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}
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; CHECK-LABEL: test_invoke_code_callsite3
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define i32 @test_invoke_code_callsite3(i1 %c) personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
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entry:
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br i1 %c, label %if.then, label %if.end
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; CHECK: edge entry -> if.then probability is 0x07878788 / 0x80000000 = 5.88%
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; CHECK: edge entry -> if.end probability is 0x78787878 / 0x80000000 = 94.12% [HOT edge]
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if.then:
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invoke i32 @InvokeCall()
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to label %invoke.cont unwind label %lpad
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; Regardless of cold calls, edge weights from a invoke instruction should be
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; determined by the invoke heuristic.
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; CHECK: edge if.then -> invoke.cont probability is 0x7ffff800 / 0x80000000 = 100.00% [HOT edge]
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; CHECK: edge if.then -> lpad probability is 0x00000800 / 0x80000000 = 0.00%
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invoke.cont:
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call void @ColdFunc() #0
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br label %if.end
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lpad:
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%ll = landingpad { i8*, i32 }
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cleanup
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call void @ColdFunc() #0
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br label %if.end
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if.end:
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ret i32 0
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}
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declare i32 @__gxx_personality_v0(...)
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declare void @ColdFunc()
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declare i32 @InvokeCall()
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attributes #0 = { cold }
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define i32 @zero1(i32 %i, i32 %a, i32 %b) {
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; CHECK: Printing analysis {{.*}} for function 'zero1'
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entry:
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%cond = icmp eq i32 %i, 0
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br i1 %cond, label %then, label %else
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; CHECK: edge entry -> then probability is 0x30000000 / 0x80000000 = 37.50%
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; CHECK: edge entry -> else probability is 0x50000000 / 0x80000000 = 62.50%
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then:
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br label %exit
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else:
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br label %exit
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exit:
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%result = phi i32 [ %a, %then ], [ %b, %else ]
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ret i32 %result
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}
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define i32 @zero2(i32 %i, i32 %a, i32 %b) {
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; CHECK: Printing analysis {{.*}} for function 'zero2'
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entry:
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%cond = icmp ne i32 %i, -1
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br i1 %cond, label %then, label %else
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; CHECK: edge entry -> then probability is 0x50000000 / 0x80000000 = 62.50%
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; CHECK: edge entry -> else probability is 0x30000000 / 0x80000000 = 37.50%
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then:
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br label %exit
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else:
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br label %exit
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exit:
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%result = phi i32 [ %a, %then ], [ %b, %else ]
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ret i32 %result
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}
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define i32 @zero3(i32 %i, i32 %a, i32 %b) {
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; CHECK: Printing analysis {{.*}} for function 'zero3'
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entry:
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; AND'ing with a single bit bitmask essentially leads to a bool comparison,
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; meaning we don't have probability information.
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%and = and i32 %i, 2
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%tobool = icmp eq i32 %and, 0
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br i1 %tobool, label %then, label %else
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; CHECK: edge entry -> then probability is 0x40000000 / 0x80000000 = 50.00%
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; CHECK: edge entry -> else probability is 0x40000000 / 0x80000000 = 50.00%
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then:
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; AND'ing with other bitmask might be something else, so we still assume the
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; usual probabilities.
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%and2 = and i32 %i, 5
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%tobool2 = icmp eq i32 %and2, 0
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br i1 %tobool2, label %else, label %exit
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; CHECK: edge then -> else probability is 0x30000000 / 0x80000000 = 37.50%
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; CHECK: edge then -> exit probability is 0x50000000 / 0x80000000 = 62.50%
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else:
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br label %exit
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exit:
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%result = phi i32 [ %a, %then ], [ %b, %else ]
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ret i32 %result
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}
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define i32 @test_unreachable_with_prof_greater(i32 %a, i32 %b) {
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; CHECK: Printing analysis {{.*}} for function 'test_unreachable_with_prof_greater'
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entry:
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%cond = icmp eq i32 %a, 42
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br i1 %cond, label %exit, label %unr, !prof !4
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; CHECK: edge entry -> exit probability is 0x7ffff800 / 0x80000000 = 100.00% [HOT edge]
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; CHECK: edge entry -> unr probability is 0x00000800 / 0x80000000 = 0.00%
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unr:
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unreachable
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exit:
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ret i32 %b
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}
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!4 = !{!"branch_weights", i32 0, i32 1}
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define i32 @test_unreachable_with_prof_equal(i32 %a, i32 %b) {
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; CHECK: Printing analysis {{.*}} for function 'test_unreachable_with_prof_equal'
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entry:
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%cond = icmp eq i32 %a, 42
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br i1 %cond, label %exit, label %unr, !prof !5
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; CHECK: edge entry -> exit probability is 0x7ffff800 / 0x80000000 = 100.00% [HOT edge]
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; CHECK: edge entry -> unr probability is 0x00000800 / 0x80000000 = 0.00%
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unr:
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unreachable
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exit:
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ret i32 %b
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}
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!5 = !{!"branch_weights", i32 1048575, i32 1}
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define i32 @test_unreachable_with_prof_zero(i32 %a, i32 %b) {
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; CHECK: Printing analysis {{.*}} for function 'test_unreachable_with_prof_zero'
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entry:
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%cond = icmp eq i32 %a, 42
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br i1 %cond, label %exit, label %unr, !prof !6
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; CHECK: edge entry -> exit probability is 0x7ffff800 / 0x80000000 = 100.00% [HOT edge]
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; CHECK: edge entry -> unr probability is 0x00000800 / 0x80000000 = 0.00%
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unr:
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unreachable
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exit:
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ret i32 %b
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}
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!6 = !{!"branch_weights", i32 0, i32 0}
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define i32 @test_unreachable_with_prof_less(i32 %a, i32 %b) {
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; CHECK: Printing analysis {{.*}} for function 'test_unreachable_with_prof_less'
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entry:
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%cond = icmp eq i32 %a, 42
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br i1 %cond, label %exit, label %unr, !prof !7
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; CHECK: edge entry -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
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|
; CHECK: edge entry -> unr probability is 0x00000000 / 0x80000000 = 0.00%
|
|
|
|
unr:
|
|
unreachable
|
|
|
|
exit:
|
|
ret i32 %b
|
|
}
|
|
|
|
!7 = !{!"branch_weights", i32 1, i32 0}
|
|
|
|
define i32 @test_unreachable_with_switch_prof1(i32 %i, i32 %a, i32 %b, i32 %c, i32 %d, i32 %e) {
|
|
; CHECK: Printing analysis {{.*}} for function 'test_unreachable_with_switch_prof1'
|
|
entry:
|
|
switch i32 %i, label %case_a [ i32 1, label %case_b
|
|
i32 2, label %case_c
|
|
i32 3, label %case_d
|
|
i32 4, label %case_e ], !prof !8
|
|
; CHECK: edge entry -> case_a probability is 0x00000800 / 0x80000000 = 0.00%
|
|
; CHECK: edge entry -> case_b probability is 0x07fffe01 / 0x80000000 = 6.25%
|
|
; CHECK: edge entry -> case_c probability is 0x67fffdff / 0x80000000 = 81.25% [HOT edge]
|
|
; CHECK: edge entry -> case_d probability is 0x07fffdff / 0x80000000 = 6.25%
|
|
; CHECK: edge entry -> case_e probability is 0x07fffdff / 0x80000000 = 6.25%
|
|
|
|
case_a:
|
|
unreachable
|
|
|
|
case_b:
|
|
br label %exit
|
|
; CHECK: edge case_b -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
|
|
|
|
case_c:
|
|
br label %exit
|
|
; CHECK: edge case_c -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
|
|
|
|
case_d:
|
|
br label %exit
|
|
; CHECK: edge case_d -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
|
|
|
|
case_e:
|
|
br label %exit
|
|
; CHECK: edge case_e -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
|
|
|
|
exit:
|
|
%result = phi i32 [ %b, %case_b ],
|
|
[ %c, %case_c ],
|
|
[ %d, %case_d ],
|
|
[ %e, %case_e ]
|
|
ret i32 %result
|
|
}
|
|
|
|
!8 = !{!"branch_weights", i32 4, i32 4, i32 64, i32 4, i32 4}
|
|
|
|
define i32 @test_unreachable_with_switch_prof2(i32 %i, i32 %a, i32 %b, i32 %c, i32 %d, i32 %e) {
|
|
; CHECK: Printing analysis {{.*}} for function 'test_unreachable_with_switch_prof2'
|
|
entry:
|
|
switch i32 %i, label %case_a [ i32 1, label %case_b
|
|
i32 2, label %case_c
|
|
i32 3, label %case_d
|
|
i32 4, label %case_e ], !prof !9
|
|
; CHECK: edge entry -> case_a probability is 0x00000400 / 0x80000000 = 0.00%
|
|
; CHECK: edge entry -> case_b probability is 0x00000400 / 0x80000000 = 0.00%
|
|
; CHECK: edge entry -> case_c probability is 0x6aaaa800 / 0x80000000 = 83.33% [HOT edge]
|
|
; CHECK: edge entry -> case_d probability is 0x0aaaa7ff / 0x80000000 = 8.33%
|
|
; CHECK: edge entry -> case_e probability is 0x0aaaa7ff / 0x80000000 = 8.33%
|
|
|
|
case_a:
|
|
unreachable
|
|
|
|
case_b:
|
|
unreachable
|
|
|
|
case_c:
|
|
br label %exit
|
|
; CHECK: edge case_c -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
|
|
|
|
case_d:
|
|
br label %exit
|
|
; CHECK: edge case_d -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
|
|
|
|
case_e:
|
|
br label %exit
|
|
; CHECK: edge case_e -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
|
|
|
|
exit:
|
|
%result = phi i32 [ %c, %case_c ],
|
|
[ %d, %case_d ],
|
|
[ %e, %case_e ]
|
|
ret i32 %result
|
|
}
|
|
|
|
!9 = !{!"branch_weights", i32 4, i32 4, i32 64, i32 4, i32 4}
|
|
|
|
define i32 @test_unreachable_with_switch_prof3(i32 %i, i32 %a, i32 %b, i32 %c, i32 %d, i32 %e) {
|
|
; CHECK: Printing analysis {{.*}} for function 'test_unreachable_with_switch_prof3'
|
|
entry:
|
|
switch i32 %i, label %case_a [ i32 1, label %case_b
|
|
i32 2, label %case_c
|
|
i32 3, label %case_d
|
|
i32 4, label %case_e ], !prof !10
|
|
; CHECK: edge entry -> case_a probability is 0x00000000 / 0x80000000 = 0.00%
|
|
; CHECK: edge entry -> case_b probability is 0x00000400 / 0x80000000 = 0.00%
|
|
; CHECK: edge entry -> case_c probability is 0x6e08fa2e / 0x80000000 = 85.96% [HOT edge]
|
|
; CHECK: edge entry -> case_d probability is 0x08fb80e9 / 0x80000000 = 7.02%
|
|
; CHECK: edge entry -> case_e probability is 0x08fb80e9 / 0x80000000 = 7.02%
|
|
|
|
case_a:
|
|
unreachable
|
|
|
|
case_b:
|
|
unreachable
|
|
|
|
case_c:
|
|
br label %exit
|
|
; CHECK: edge case_c -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
|
|
|
|
case_d:
|
|
br label %exit
|
|
; CHECK: edge case_d -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
|
|
|
|
case_e:
|
|
br label %exit
|
|
; CHECK: edge case_e -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
|
|
|
|
exit:
|
|
%result = phi i32 [ %c, %case_c ],
|
|
[ %d, %case_d ],
|
|
[ %e, %case_e ]
|
|
ret i32 %result
|
|
}
|
|
|
|
!10 = !{!"branch_weights", i32 0, i32 4, i32 64, i32 4, i32 4}
|
|
|
|
define i32 @test_unreachable_with_switch_prof4(i32 %i, i32 %a, i32 %b, i32 %c, i32 %d, i32 %e) {
|
|
; CHECK: Printing analysis {{.*}} for function 'test_unreachable_with_switch_prof4'
|
|
entry:
|
|
switch i32 %i, label %case_a [ i32 1, label %case_b
|
|
i32 2, label %case_c
|
|
i32 3, label %case_d
|
|
i32 4, label %case_e ], !prof !11
|
|
; CHECK: edge entry -> case_a probability is 0x1999999a / 0x80000000 = 20.00%
|
|
; CHECK: edge entry -> case_b probability is 0x1999999a / 0x80000000 = 20.00%
|
|
; CHECK: edge entry -> case_c probability is 0x1999999a / 0x80000000 = 20.00%
|
|
; CHECK: edge entry -> case_d probability is 0x1999999a / 0x80000000 = 20.00%
|
|
; CHECK: edge entry -> case_e probability is 0x1999999a / 0x80000000 = 20.00%
|
|
|
|
case_a:
|
|
unreachable
|
|
|
|
case_b:
|
|
unreachable
|
|
|
|
case_c:
|
|
unreachable
|
|
|
|
case_d:
|
|
unreachable
|
|
|
|
case_e:
|
|
unreachable
|
|
|
|
}
|
|
|
|
!11 = !{!"branch_weights", i32 0, i32 4, i32 64, i32 4, i32 4}
|