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[CodeExtractor] Fix sinking of allocas with multiple bitcast uses (PR42451)

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An alloca which can be sunk into the extraction region may have more
than one bitcast use. Move these uses along with the alloca to prevent
use-before-def.

Testing: check-llvm, stage2 build of clang

Fixes llvm.org/PR42451.

Differential Revision: https://reviews.llvm.org/D64463

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@365660 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Vedant Kumar
2019-07-10 16:32:20 +00:00
parent 899d0e6438
commit 0edfaf6dd2
3 changed files with 104 additions and 14 deletions
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test/Transforms/CodeExtractor/live_shrink_multiple.ll
+1 -1
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@@ -45,9 +45,9 @@ bb:
; CHECK-LABEL: define internal void @_Z3foov.1.
; CHECK: newFuncRoot:
; CHECK-NEXT: alloca
; CHECK-NEXT: alloca
; CHECK-NEXT: bitcast
; CHECK-NEXT: call void @llvm.lifetime.start.p0i8
; CHECK-NEXT: alloca
; CHECK-NEXT: bitcast
; CHECK-NEXT: call void @llvm.lifetime.start.p0i8
; CHECK: call void @llvm.lifetime.end.p0i8