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| author | Rafael Espindola <rafael.espindola@gmail.com> | 2012-04-04 12:51:34 +0000 |
|---|---|---|
| committer | Rafael Espindola <rafael.espindola@gmail.com> | 2012-04-04 12:51:34 +0000 |
| commit | 26c8dcc692fb2addd475446cfff24d6a4e958bca (patch) | |
| tree | b71cb0d781e2735397c728f276f14ea63780d04c /test/Transforms/InstCombine/pr12251.ll | |
| parent | 00b73a5e443d49d68f59a5fb517e940842423ae6 (diff) | |
| download | external_llvm-26c8dcc692fb2addd475446cfff24d6a4e958bca.zip external_llvm-26c8dcc692fb2addd475446cfff24d6a4e958bca.tar.gz external_llvm-26c8dcc692fb2addd475446cfff24d6a4e958bca.tar.bz2 | |
Always compute all the bits in ComputeMaskedBits.
This allows us to keep passing reduced masks to SimplifyDemandedBits, but
know about all the bits if SimplifyDemandedBits fails. This allows instcombine
to simplify cases like the one in the included testcase.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154011 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Transforms/InstCombine/pr12251.ll')
| -rw-r--r-- | test/Transforms/InstCombine/pr12251.ll | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/test/Transforms/InstCombine/pr12251.ll b/test/Transforms/InstCombine/pr12251.ll new file mode 100644 index 0000000..74a41eb --- /dev/null +++ b/test/Transforms/InstCombine/pr12251.ll @@ -0,0 +1,15 @@ +; RUN: opt < %s -instcombine -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} |