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Reapply r153423; the original commit was fine. The failing test, distray, had

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undefined behavior, which Rafael was kind enough to fix.

Original commit message for r153423:
Use the new range metadata in computeMaskedBits and add a new optimization to
instruction simplify that lets us remove an and when loding a boolean value.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153521 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chad Rosier
2012-03-27 17:44:52 +00:00
parent 805543068e
commit d23a64cc16
3 changed files with 56 additions and 0 deletions
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15
test/Transforms/InstSimplify/pr12251.ll Normal file
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@@ -0,0 +1,15 @@
; RUN: opt < %s -instsimplify -S | FileCheck %s
define zeroext i1 @_Z3fooPb(i8* nocapture %x) {
entry:
%a = load i8* %x, align 1, !range !0
%b = and i8 %a, 1
%tobool = icmp ne i8 %b, 0
ret i1 %tobool
}
; CHECK: %a = load i8* %x, align 1, !range !0
; CHECK-NEXT: %tobool = icmp ne i8 %a, 0
; CHECK-NEXT: ret i1 %tobool
!0 = metadata !{i8 0, i8 2}