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clang-p2996/llvm/test/Transforms/IRCE/unsigned_comparisons_ult.ll
Fedor Sergeev 194a407bda [New PM][IRCE] port of Inductive Range Check Elimination pass to the new pass manager 
There are two nontrivial details here:
* Loop structure update interface is quite different with new pass manager,
  so the code to add new loops was factored out

* BranchProbabilityInfo is not a loop analysis, so it can not be just getResult'ed from
  within the loop pass. It cant even be queried through getCachedResult as LoopCanonicalization
  sequence (e.g. LoopSimplify) might invalidate BPI results.

  Complete solution for BPI will likely take some time to discuss and figure out,
  so for now this was partially solved by making BPI optional in IRCE
  (skipping a couple of profitability checks if it is absent).

Most of the IRCE tests got their corresponding new-pass-manager variant enabled.
Only two of them depend on BPI, both marked with TODO, to be turned on when BPI
starts being available for loop passes.

Reviewers: chandlerc, mkazantsev, sanjoy, asbirlea
Reviewed By: mkazantsev
Differential Revision: https://reviews.llvm.org/D43795

llvm-svn: 327619
2018-03-15 11:01:19 +00:00

392 lines
14 KiB
LLVM
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; RUN: opt -verify-loop-info -irce-print-changed-loops -irce -S < %s 2>&1 | FileCheck %s
; RUN: opt -verify-loop-info -irce-print-changed-loops -passes='require<branch-prob>,loop(irce)' -S < %s 2>&1 | FileCheck %s
; CHECK: irce: in function test_01: constrained Loop at depth 1 containing: %loop<header><exiting>,%in.bounds<latch><exiting>
; CHECK: irce: in function test_02: constrained Loop at depth 1 containing: %loop<header><exiting>,%in.bounds<latch><exiting>
; CHECK: irce: in function test_03: constrained Loop at depth 1 containing: %loop<header><exiting>,%in.bounds<latch><exiting>
; CHECK: irce: in function test_04: constrained Loop at depth 1 containing: %loop<header><exiting>,%in.bounds<latch><exiting>
; CHECK: irce: in function test_05: constrained Loop at depth 1 containing: %loop<header><exiting>,%in.bounds<latch><exiting>
; CHECK: irce: in function test_06: constrained Loop at depth 1 containing: %loop<header><exiting>,%in.bounds<latch><exiting>
; CHECK-NOT: irce: in function test_07: constrained Loop at depth 1 containing: %loop<header><exiting>,%in.bounds<latch><exiting>
; CHECK: irce: in function test_08: constrained Loop at depth 1 containing: %loop<header><exiting>,%in.bounds<latch><exiting>
; CHECK-NOT: irce: in function test_09: constrained Loop at depth 1 containing: %loop<header><exiting>,%in.bounds<latch><exiting>
; ULT condition for increasing loop.
define void @test_01(i32* %arr, i32* %a_len_ptr) #0 {
; CHECK: test_01
; CHECK: entry:
; CHECK-NEXT: %exit.mainloop.at = load i32, i32* %a_len_ptr, !range !0
; CHECK-NEXT: [[COND:%[^ ]+]] = icmp ult i32 0, %exit.mainloop.at
; CHECK-NEXT: br i1 [[COND]], label %loop.preheader, label %main.pseudo.exit
; CHECK: loop:
; CHECK-NEXT: %idx = phi i32 [ %idx.next, %in.bounds ], [ 0, %loop.preheader ]
; CHECK-NEXT: %idx.next = add nuw nsw i32 %idx, 1
; CHECK-NEXT: %abc = icmp ult i32 %idx, %exit.mainloop.at
; CHECK-NEXT: br i1 true, label %in.bounds, label %out.of.bounds.loopexit1
; CHECK-NOT: loop.preloop:
; CHECK: loop.postloop:
; CHECK-NEXT: %idx.postloop = phi i32 [ %idx.copy, %postloop ], [ %idx.next.postloop, %in.bounds.postloop ]
; CHECK-NEXT: %idx.next.postloop = add nuw nsw i32 %idx.postloop, 1
; CHECK-NEXT: %abc.postloop = icmp ult i32 %idx.postloop, %exit.mainloop.at
; CHECK-NEXT: br i1 %abc.postloop, label %in.bounds.postloop, label %out.of.bounds.loopexit
entry:
%len = load i32, i32* %a_len_ptr, !range !0
br label %loop
loop:
%idx = phi i32 [ 0, %entry ], [ %idx.next, %in.bounds ]
%idx.next = add nsw nuw i32 %idx, 1
%abc = icmp ult i32 %idx, %len
br i1 %abc, label %in.bounds, label %out.of.bounds
in.bounds:
%addr = getelementptr i32, i32* %arr, i32 %idx
store i32 0, i32* %addr
%next = icmp ult i32 %idx.next, 100
br i1 %next, label %loop, label %exit
out.of.bounds:
ret void
exit:
ret void
}
; ULT condition for decreasing loops.
define void @test_02(i32* %arr, i32* %a_len_ptr) #0 {
; CHECK: test_02(
; CHECK: entry:
; CHECK-NEXT: %len = load i32, i32* %a_len_ptr, !range !0
; CHECK-NEXT: [[COND1:%[^ ]+]] = icmp ugt i32 %len, 1
; CHECK-NEXT: %umax = select i1 [[COND1]], i32 %len, i32 1
; CHECK-NEXT: %exit.preloop.at = add i32 %umax, -1
; CHECK-NEXT: [[COND2:%[^ ]+]] = icmp ugt i32 100, %exit.preloop.at
; CHECK-NEXT: br i1 [[COND2]], label %loop.preloop.preheader, label %preloop.pseudo.exit
; CHECK: mainloop:
; CHECK-NEXT: br label %loop
; CHECK: loop:
; CHECK-NEXT: %idx = phi i32 [ %idx.preloop.copy, %mainloop ], [ %idx.next, %in.bounds ]
; CHECK-NEXT: %idx.next = add i32 %idx, -1
; CHECK-NEXT: %abc = icmp ult i32 %idx, %len
; CHECK-NEXT: br i1 true, label %in.bounds, label %out.of.bounds.loopexit1
; CHECK-NOT: loop.postloop:
; CHECK: loop.preloop:
; CHECK-NEXT: %idx.preloop = phi i32 [ %idx.next.preloop, %in.bounds.preloop ], [ 100, %loop.preloop.preheader ]
; CHECK-NEXT: %idx.next.preloop = add i32 %idx.preloop, -1
; CHECK-NEXT: %abc.preloop = icmp ult i32 %idx.preloop, %len
; CHECK-NEXT: br i1 %abc.preloop, label %in.bounds.preloop, label %out.of.bounds.loopexit
entry:
%len = load i32, i32* %a_len_ptr, !range !0
br label %loop
loop:
%idx = phi i32 [ 100, %entry ], [ %idx.next, %in.bounds ]
%idx.next = add i32 %idx, -1
%abc = icmp ult i32 %idx, %len
br i1 %abc, label %in.bounds, label %out.of.bounds
in.bounds:
%addr = getelementptr i32, i32* %arr, i32 %idx
store i32 0, i32* %addr
%next = icmp ult i32 %idx.next, 1
br i1 %next, label %exit, label %loop
out.of.bounds:
ret void
exit:
ret void
}
; Check SINT_MAX.
define void @test_03(i32* %arr, i32* %a_len_ptr) #0 {
; CHECK: test_03
; CHECK: entry:
; CHECK-NEXT: %exit.mainloop.at = load i32, i32* %a_len_ptr, !range !0
; CHECK-NEXT: [[COND:%[^ ]+]] = icmp ult i32 0, %exit.mainloop.at
; CHECK-NEXT: br i1 [[COND]], label %loop.preheader, label %main.pseudo.exit
; CHECK: loop:
; CHECK-NEXT: %idx = phi i32 [ %idx.next, %in.bounds ], [ 0, %loop.preheader ]
; CHECK-NEXT: %idx.next = add nuw nsw i32 %idx, 1
; CHECK-NEXT: %abc = icmp ult i32 %idx, %exit.mainloop.at
; CHECK-NEXT: br i1 true, label %in.bounds, label %out.of.bounds.loopexit1
; CHECK-NOT: loop.preloop:
; CHECK: loop.postloop:
; CHECK-NEXT: %idx.postloop = phi i32 [ %idx.copy, %postloop ], [ %idx.next.postloop, %in.bounds.postloop ]
; CHECK-NEXT: %idx.next.postloop = add nuw nsw i32 %idx.postloop, 1
; CHECK-NEXT: %abc.postloop = icmp ult i32 %idx.postloop, %exit.mainloop.at
; CHECK-NEXT: br i1 %abc.postloop, label %in.bounds.postloop, label %out.of.bounds.loopexit
entry:
%len = load i32, i32* %a_len_ptr, !range !0
br label %loop
loop:
%idx = phi i32 [ 0, %entry ], [ %idx.next, %in.bounds ]
%idx.next = add nsw nuw i32 %idx, 1
%abc = icmp ult i32 %idx, %len
br i1 %abc, label %in.bounds, label %out.of.bounds
in.bounds:
%addr = getelementptr i32, i32* %arr, i32 %idx
store i32 0, i32* %addr
%next = icmp ult i32 %idx.next, 2147483647
br i1 %next, label %loop, label %exit
out.of.bounds:
ret void
exit:
ret void
}
; Check SINT_MAX + 1, test is similar to test_01.
define void @test_04(i32* %arr, i32* %a_len_ptr) #0 {
; CHECK: test_04
; CHECK: entry:
; CHECK-NEXT: %exit.mainloop.at = load i32, i32* %a_len_ptr, !range !0
; CHECK-NEXT: [[COND:%[^ ]+]] = icmp ult i32 0, %exit.mainloop.at
; CHECK-NEXT: br i1 [[COND]], label %loop.preheader, label %main.pseudo.exit
; CHECK: loop:
; CHECK-NEXT: %idx = phi i32 [ %idx.next, %in.bounds ], [ 0, %loop.preheader ]
; CHECK-NEXT: %idx.next = add nuw nsw i32 %idx, 1
; CHECK-NEXT: %abc = icmp ult i32 %idx, %exit.mainloop.at
; CHECK-NEXT: br i1 true, label %in.bounds, label %out.of.bounds.loopexit1
; CHECK-NOT: loop.preloop:
; CHECK: loop.postloop:
; CHECK-NEXT: %idx.postloop = phi i32 [ %idx.copy, %postloop ], [ %idx.next.postloop, %in.bounds.postloop ]
; CHECK-NEXT: %idx.next.postloop = add nuw nsw i32 %idx.postloop, 1
; CHECK-NEXT: %abc.postloop = icmp ult i32 %idx.postloop, %exit.mainloop.at
; CHECK-NEXT: br i1 %abc.postloop, label %in.bounds.postloop, label %out.of.bounds.loopexit
entry:
%len = load i32, i32* %a_len_ptr, !range !0
br label %loop
loop:
%idx = phi i32 [ 0, %entry ], [ %idx.next, %in.bounds ]
%idx.next = add nsw nuw i32 %idx, 1
%abc = icmp ult i32 %idx, %len
br i1 %abc, label %in.bounds, label %out.of.bounds
in.bounds:
%addr = getelementptr i32, i32* %arr, i32 %idx
store i32 0, i32* %addr
%next = icmp ult i32 %idx.next, 2147483648
br i1 %next, label %loop, label %exit
out.of.bounds:
ret void
exit:
ret void
}
; Check SINT_MAX + 1, test is similar to test_02.
define void @test_05(i32* %arr, i32* %a_len_ptr) #0 {
; CHECK: test_05(
; CHECK: entry:
; CHECK-NEXT: %len = load i32, i32* %a_len_ptr, !range !0
; CHECK-NEXT: [[COND1:%[^ ]+]] = icmp ugt i32 %len, 1
; CHECK-NEXT: %umax = select i1 [[COND1]], i32 %len, i32 1
; CHECK-NEXT: %exit.preloop.at = add i32 %umax, -1
; CHECK-NEXT: [[COND2:%[^ ]+]] = icmp ugt i32 -2147483648, %exit.preloop.at
; CHECK-NEXT: br i1 [[COND2]], label %loop.preloop.preheader, label %preloop.pseudo.exit
; CHECK: mainloop:
; CHECK-NEXT: br label %loop
; CHECK: loop:
; CHECK-NEXT: %idx = phi i32 [ %idx.preloop.copy, %mainloop ], [ %idx.next, %in.bounds ]
; CHECK-NEXT: %idx.next = add i32 %idx, -1
; CHECK-NEXT: %abc = icmp ult i32 %idx, %len
; CHECK-NEXT: br i1 true, label %in.bounds, label %out.of.bounds.loopexit1
; CHECK-NOT: loop.postloop:
; CHECK: loop.preloop:
; CHECK-NEXT: %idx.preloop = phi i32 [ %idx.next.preloop, %in.bounds.preloop ], [ -2147483648, %loop.preloop.preheader ]
; CHECK-NEXT: %idx.next.preloop = add i32 %idx.preloop, -1
; CHECK-NEXT: %abc.preloop = icmp ult i32 %idx.preloop, %len
; CHECK-NEXT: br i1 %abc.preloop, label %in.bounds.preloop, label %out.of.bounds.loopexit
entry:
%len = load i32, i32* %a_len_ptr, !range !0
br label %loop
loop:
%idx = phi i32 [ 2147483648, %entry ], [ %idx.next, %in.bounds ]
%idx.next = add i32 %idx, -1
%abc = icmp ult i32 %idx, %len
br i1 %abc, label %in.bounds, label %out.of.bounds
in.bounds:
%addr = getelementptr i32, i32* %arr, i32 %idx
store i32 0, i32* %addr
%next = icmp ult i32 %idx.next, 1
br i1 %next, label %exit, label %loop
out.of.bounds:
ret void
exit:
ret void
}
; Increasing loop, UINT_MAX. Positive test.
define void @test_06(i32* %arr, i32* %a_len_ptr) #0 {
; CHECK: test_06
; CHECK: entry:
; CHECK-NEXT: %exit.mainloop.at = load i32, i32* %a_len_ptr, !range !0
; CHECK-NEXT: [[COND:%[^ ]+]] = icmp ult i32 0, %exit.mainloop.at
; CHECK-NEXT: br i1 [[COND]], label %loop.preheader, label %main.pseudo.exit
; CHECK: loop:
; CHECK-NEXT: %idx = phi i32 [ %idx.next, %in.bounds ], [ 0, %loop.preheader ]
; CHECK-NEXT: %idx.next = add nuw nsw i32 %idx, 1
; CHECK-NEXT: %abc = icmp ult i32 %idx, %exit.mainloop.at
; CHECK-NEXT: br i1 true, label %in.bounds, label %out.of.bounds.loopexit1
; CHECK-NOT: loop.preloop:
; CHECK: loop.postloop:
; CHECK-NEXT: %idx.postloop = phi i32 [ %idx.copy, %postloop ], [ %idx.next.postloop, %in.bounds.postloop ]
; CHECK-NEXT: %idx.next.postloop = add nuw nsw i32 %idx.postloop, 1
; CHECK-NEXT: %abc.postloop = icmp ult i32 %idx.postloop, %exit.mainloop.at
; CHECK-NEXT: br i1 %abc.postloop, label %in.bounds.postloop, label %out.of.bounds.loopexit
entry:
%len = load i32, i32* %a_len_ptr, !range !0
br label %loop
loop:
%idx = phi i32 [ 0, %entry ], [ %idx.next, %in.bounds ]
%idx.next = add nsw nuw i32 %idx, 1
%abc = icmp ult i32 %idx, %len
br i1 %abc, label %in.bounds, label %out.of.bounds
in.bounds:
%addr = getelementptr i32, i32* %arr, i32 %idx
store i32 0, i32* %addr
%next = icmp ult i32 %idx.next, 4294967295
br i1 %next, label %loop, label %exit
out.of.bounds:
ret void
exit:
ret void
}
; Decreasing loop, UINT_MAX. Negative test: we cannot substract -1 from 0.
define void @test_07(i32* %arr, i32* %a_len_ptr) #0 {
; CHECK: test_07(
; CHECK-NOT: loop.preloop:
; CHECK-NOT: loop.postloop:
entry:
%len = load i32, i32* %a_len_ptr, !range !0
br label %loop
loop:
%idx = phi i32 [ 4294967295, %entry ], [ %idx.next, %in.bounds ]
%idx.next = add nuw i32 %idx, -1
%abc = icmp ult i32 %idx, %len
br i1 %abc, label %in.bounds, label %out.of.bounds
in.bounds:
%addr = getelementptr i32, i32* %arr, i32 %idx
store i32 0, i32* %addr
%next = icmp ult i32 %idx.next, 0
br i1 %next, label %exit, label %loop
out.of.bounds:
ret void
exit:
ret void
}
; Unsigned walking through signed border is allowed.
; Iteration space [0; UINT_MAX - 99), the fact that SINT_MAX is within this
; range does not prevent us from performing IRCE.
define void @test_08(i32* %arr, i32* %a_len_ptr) #0 {
; CHECK: test_08
; CHECK: entry:
; CHECK-NEXT: %exit.mainloop.at = load i32, i32* %a_len_ptr, !range !0
; CHECK-NEXT: [[COND:%[^ ]+]] = icmp ult i32 0, %exit.mainloop.at
; CHECK-NEXT: br i1 [[COND]], label %loop.preheader, label %main.pseudo.exit
; CHECK: loop:
; CHECK-NEXT: %idx = phi i32 [ %idx.next, %in.bounds ], [ 0, %loop.preheader ]
; CHECK-NEXT: %idx.next = add i32 %idx, 1
; CHECK-NEXT: %abc = icmp ult i32 %idx, %exit.mainloop.at
; CHECK-NEXT: br i1 true, label %in.bounds, label %out.of.bounds.loopexit1
; CHECK-NOT: loop.preloop:
; CHECK: loop.postloop:
; CHECK-NEXT: %idx.postloop = phi i32 [ %idx.copy, %postloop ], [ %idx.next.postloop, %in.bounds.postloop ]
; CHECK-NEXT: %idx.next.postloop = add i32 %idx.postloop, 1
; CHECK-NEXT: %abc.postloop = icmp ult i32 %idx.postloop, %exit.mainloop.at
; CHECK-NEXT: br i1 %abc.postloop, label %in.bounds.postloop, label %out.of.bounds.loopexit
entry:
%len = load i32, i32* %a_len_ptr, !range !0
br label %loop
loop:
%idx = phi i32 [ 0, %entry ], [ %idx.next, %in.bounds ]
%idx.next = add i32 %idx, 1
%abc = icmp ult i32 %idx, %len
br i1 %abc, label %in.bounds, label %out.of.bounds
in.bounds:
%addr = getelementptr i32, i32* %arr, i32 %idx
store i32 0, i32* %addr
%next = icmp ult i32 %idx.next, -100
br i1 %next, label %loop, label %exit
out.of.bounds:
ret void
exit:
ret void
}
; Walking through the border of unsigned range is not allowed
; (iteration space [-100; 100)). Negative test.
define void @test_09(i32* %arr, i32* %a_len_ptr) #0 {
; CHECK: test_09
; CHECK-NOT: preloop
; CHECK-NOT: postloop
; CHECK-NOT: br i1 false
; CHECK-NOT: br i1 true
entry:
%len = load i32, i32* %a_len_ptr, !range !0
br label %loop
loop:
%idx = phi i32 [ -100, %entry ], [ %idx.next, %in.bounds ]
%idx.next = add i32 %idx, 1
%abc = icmp ult i32 %idx, %len
br i1 %abc, label %in.bounds, label %out.of.bounds
in.bounds:
%addr = getelementptr i32, i32* %arr, i32 %idx
store i32 0, i32* %addr
%next = icmp ult i32 %idx.next, 100
br i1 %next, label %loop, label %exit
out.of.bounds:
ret void
exit:
ret void
}
!0 = !{i32 0, i32 50}
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