e2fc11cf9f
This patch teaches the jump threading pass to call BPI->eraseBlock when it folds a conditional branch. Without this patch, BranchProbabilityInfo could end up with stale edge probabilities for the basic block containing the conditional branch -- one edge probability with less than 1.0 and the other for a removed edge. Differential Revision: https://reviews.llvm.org/D92608
30 lines
539 B
LLVM
30 lines
539 B
LLVM
; RUN: opt -debug-only=branch-prob -jump-threading -S %s 2>&1 | FileCheck %s
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; REQUIRES: asserts
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; Make sure that we clear edge probabilities for bb1 as we fold
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; the conditional branch in it.
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; CHECK: eraseBlock bb1
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define i32 @foo(i32 %arg) !prof !0 {
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; CHECK-LABEL: @foo
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%cond1 = icmp eq i32 %arg, 42
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br i1 %cond1, label %bb1, label %bb2
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bb2:
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ret i32 2
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bb1:
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%cond2 = icmp eq i32 %arg, 42
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br i1 %cond2, label %bb3, label %bb4
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bb3:
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ret i32 3
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bb4:
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; CHECK-NOT: bb4:
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ret i32 4
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}
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!0 = !{!"function_entry_count", i64 0}
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