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| author | David Majnemer <david.majnemer@gmail.com> | 2014-05-15 00:02:20 +0000 |
|---|---|---|
| committer | David Majnemer <david.majnemer@gmail.com> | 2014-05-15 00:02:20 +0000 |
| commit | 186c94244c96b25bf4cd4924dc1db335d849e5c9 (patch) | |
| tree | f387cf98c0f46eb530ca36e2955f1dcdf5cb2eeb /llvm/test/Transforms/InstCombine | |
| parent | ceae1fbafd13b67cf0c6d5d784ada87455fd9a2f (diff) | |
| download | bcm5719-llvm-186c94244c96b25bf4cd4924dc1db335d849e5c9.tar.gz bcm5719-llvm-186c94244c96b25bf4cd4924dc1db335d849e5c9.zip | |
InstCombine: Optimize -x s< cst
Summary:
This gets rid of a sub instruction by moving the negation to the
constant when valid.
Reviewers: nicholas
Subscribers: llvm-commits
Differential Revision: http://reviews.llvm.org/D3773
llvm-svn: 208827
Diffstat (limited to 'llvm/test/Transforms/InstCombine')
| -rw-r--r-- | llvm/test/Transforms/InstCombine/icmp.ll | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/llvm/test/Transforms/InstCombine/icmp.ll b/llvm/test/Transforms/InstCombine/icmp.ll index 12a4744cc0f..f45897cd3ee 100644 --- a/llvm/test/Transforms/InstCombine/icmp.ll +++ b/llvm/test/Transforms/InstCombine/icmp.ll @@ -1356,3 +1356,12 @@ define i1 @icmp_ashr_ashr_ne(i32 %a, i32 %b) nounwind { %z = icmp ne i32 %x, %y ret i1 %z } + +; CHECK-LABEL: @icmp_neg_cst_slt +; CHECK-NEXT: [[CMP:%[a-z0-9]+]] = icmp sgt i32 %a, 10 +; CHECK-NEXT: ret i1 [[CMP]] +define i1 @icmp_neg_cst_slt(i32 %a) { + %1 = sub nsw i32 0, %a + %2 = icmp slt i32 %1, -10 + ret i1 %2 +} |
