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Fix a typo in ValueTracking that's causing instcombine to delete needed shift instructions.
llvm-svn: 98416
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bfdbd2f3a2
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@ -779,7 +779,7 @@ unsigned llvm::ComputeNumSignBits(Value *V, const TargetData *TD,
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for (unsigned i = 1, e = PN->getNumIncomingValues(); i != e; ++i) {
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for (unsigned i = 1, e = PN->getNumIncomingValues(); i != e; ++i) {
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if (Tmp == 1) return Tmp;
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if (Tmp == 1) return Tmp;
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Tmp = std::min(Tmp,
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Tmp = std::min(Tmp,
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ComputeNumSignBits(PN->getIncomingValue(1), TD, Depth+1));
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ComputeNumSignBits(PN->getIncomingValue(i), TD, Depth+1));
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}
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}
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return Tmp;
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return Tmp;
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}
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}
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@ -56,3 +56,23 @@ C:
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; CHECK: %P = phi i64
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; CHECK: %P = phi i64
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; CHECK-NEXT: ret i64 %P
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; CHECK-NEXT: ret i64 %P
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}
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}
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; rdar://7732987
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define i32 @test5(i32 %Y) {
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br i1 undef, label %A, label %C
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A:
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br i1 undef, label %B, label %D
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B:
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br label %D
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C:
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br i1 undef, label %D, label %E
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D:
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%P = phi i32 [0, %A], [0, %B], [%Y, %C]
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%S = ashr i32 %P, 16
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ret i32 %S
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; CHECK: @test5
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; CHECK: %P = phi i32
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; CHECK-NEXT: ashr i32 %P, 16
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E:
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ret i32 0
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}
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