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| author | David Majnemer <david.majnemer@gmail.com> | 2014-05-16 16:57:04 +0000 |
|---|---|---|
| committer | David Majnemer <david.majnemer@gmail.com> | 2014-05-16 16:57:04 +0000 |
| commit | ea8d5dbf249dd6a8b21603794fe368bb82082ca4 (patch) | |
| tree | fea6c74214828c3fc554a41025023f5a3d6bebc7 /llvm/test | |
| parent | 83c57436500fca8f09cf00e816470df46bd5ca6f (diff) | |
| download | bcm5719-llvm-ea8d5dbf249dd6a8b21603794fe368bb82082ca4.tar.gz bcm5719-llvm-ea8d5dbf249dd6a8b21603794fe368bb82082ca4.zip | |
InstSimplify: Optimize using dividend in sdiv
Summary:
The dividend in an sdiv tells us the largest and smallest possible
results. Use this fact to optimize comparisons against an sdiv with a
constant dividend.
Reviewers: nicholas
Subscribers: llvm-commits
Differential Revision: http://reviews.llvm.org/D3795
llvm-svn: 208999
Diffstat (limited to 'llvm/test')
| -rw-r--r-- | llvm/test/Transforms/InstSimplify/compare.ll | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/llvm/test/Transforms/InstSimplify/compare.ll b/llvm/test/Transforms/InstSimplify/compare.ll index 76cff902c96..0e270bbe0f9 100644 --- a/llvm/test/Transforms/InstSimplify/compare.ll +++ b/llvm/test/Transforms/InstSimplify/compare.ll @@ -817,3 +817,12 @@ define i1 @compare_always_false_ne(i16 %a) { ; CHECK-LABEL: @compare_always_false_ne ; CHECK-NEXT: ret i1 true } + +define i1 @compare_dividend(i32 %a) { + %div = sdiv i32 2, %a + %cmp = icmp eq i32 %div, 3 + ret i1 %cmp + +; CHECK-LABEL: @compare_dividend +; CHECK-NEXT: ret i1 false +} |
