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Fix a typo in ValueTracking that's causing instcombine to delete needed shift instructions.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98416 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2010-03-13 02:20:29 +00:00
parent bc733f54c0
commit 0af20d847a
2 changed files with 21 additions and 1 deletions
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2
lib/Analysis/ValueTracking.cpp
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@@ -779,7 +779,7 @@ unsigned llvm::ComputeNumSignBits(Value *V, const TargetData *TD,
for (unsigned i = 1, e = PN->getNumIncomingValues(); i != e; ++i) { for (unsigned i = 1, e = PN->getNumIncomingValues(); i != e; ++i) {
if (Tmp == 1) return Tmp; if (Tmp == 1) return Tmp;
Tmp = std::min(Tmp, Tmp = std::min(Tmp,
ComputeNumSignBits(PN->getIncomingValue(1), TD, Depth+1)); ComputeNumSignBits(PN->getIncomingValue(i), TD, Depth+1));
} }
return Tmp; return Tmp;
} }

20
test/Transforms/InstCombine/shift-sra.ll
View File

@@ -56,3 +56,23 @@ C:
; CHECK: %P = phi i64 ; CHECK: %P = phi i64
; CHECK-NEXT: ret i64 %P ; CHECK-NEXT: ret i64 %P
} }
; rdar://7732987
define i32 @test5(i32 %Y) {
br i1 undef, label %A, label %C
A:
br i1 undef, label %B, label %D
B:
br label %D
C:
br i1 undef, label %D, label %E
D:
%P = phi i32 [0, %A], [0, %B], [%Y, %C]
%S = ashr i32 %P, 16
ret i32 %S
; CHECK: @test5
; CHECK: %P = phi i32
; CHECK-NEXT: ashr i32 %P, 16
E:
ret i32 0
}