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| author | Duncan Sands <baldrick@free.fr> | 2012-02-27 08:14:30 +0000 |
|---|---|---|
| committer | Duncan Sands <baldrick@free.fr> | 2012-02-27 08:14:30 +0000 |
| commit | 669011f50b8234bb4775d52a2d1e1ba5f6311e62 (patch) | |
| tree | 661fb8a3274b9d81dbf543c4caa01f04ea07bb5c /test/Transforms/GVN/condprop.ll | |
| parent | a89cc7fec81e28a943391d4d641816e42a141e95 (diff) | |
| download | external_llvm-669011f50b8234bb4775d52a2d1e1ba5f6311e62.zip external_llvm-669011f50b8234bb4775d52a2d1e1ba5f6311e62.tar.gz external_llvm-669011f50b8234bb4775d52a2d1e1ba5f6311e62.tar.bz2 | |
When performing a conditional branch depending on the value of a comparison
%cmp (eg: A==B) we already replace %cmp with "true" under the true edge, and
with "false" under the false edge. This change enhances this to replace the
negated compare (A!=B) with "false" under the true edge and "true" under the
false edge. Reported to improve perlbench results by 1%.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151517 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Transforms/GVN/condprop.ll')
| -rw-r--r-- | test/Transforms/GVN/condprop.ll | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/test/Transforms/GVN/condprop.ll b/test/Transforms/GVN/condprop.ll index c17c994..97a0d31 100644 --- a/test/Transforms/GVN/condprop.ll +++ b/test/Transforms/GVN/condprop.ll @@ -111,3 +111,67 @@ case3: ; CHECK: call void @bar(i32 %x) ret void } + +; CHECK: @test5 +define i1 @test5(i32 %x, i32 %y) { + %cmp = icmp eq i32 %x, %y + br i1 %cmp, label %same, label %different + +same: + %cmp2 = icmp ne i32 %x, %y +; CHECK: ret i1 false + ret i1 %cmp2 + +different: + %cmp3 = icmp eq i32 %x, %y +; CHECK: ret i1 false + ret i1 %cmp3 +} + +; CHECK: @test6 +define i1 @test6(i32 %x, i32 %y) { + %cmp2 = icmp ne i32 %x, %y + %cmp = icmp eq i32 %x, %y + %cmp3 = icmp eq i32 %x, %y + br i1 %cmp, label %same, label %different + +same: +; CHECK: ret i1 false + ret i1 %cmp2 + +different: +; CHECK: ret i1 false + ret i1 %cmp3 +} + +; CHECK: @test7 +define i1 @test7(i32 %x, i32 %y) { + %cmp = icmp sgt i32 %x, %y + br i1 %cmp, label %same, label %different + +same: + %cmp2 = icmp sle i32 %x, %y +; CHECK: ret i1 false + ret i1 %cmp2 + +different: + %cmp3 = icmp sgt i32 %x, %y +; CHECK: ret i1 false + ret i1 %cmp3 +} + +; CHECK: @test8 +define i1 @test8(i32 %x, i32 %y) { + %cmp2 = icmp sle i32 %x, %y + %cmp = icmp sgt i32 %x, %y + %cmp3 = icmp sgt i32 %x, %y + br i1 %cmp, label %same, label %different + +same: +; CHECK: ret i1 false + ret i1 %cmp2 + +different: +; CHECK: ret i1 false + ret i1 %cmp3 +} |