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| author | Chandler Carruth <chandlerc@gmail.com> | 2011-12-24 22:34:15 +0000 |
|---|---|---|
| committer | Chandler Carruth <chandlerc@gmail.com> | 2011-12-24 22:34:15 +0000 |
| commit | d62414c6547b4626bd7e4933c361f5275a6e2714 (patch) | |
| tree | 90983c98ce6717396797a3507402dc5a3c6368af /test | |
| parent | 49064ff7708bcd3b720ce79bc7629c2f3207b8d6 (diff) | |
| download | llvm-d62414c6547b4626bd7e4933c361f5275a6e2714.tar.gz llvm-d62414c6547b4626bd7e4933c361f5275a6e2714.tar.bz2 llvm-d62414c6547b4626bd7e4933c361f5275a6e2714.tar.xz | |
Add an explicit test that we now fold cttz.i32(..., true) >> 5 -> 0.
This is a result of Benjamin's work on ValueTracking.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147259 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test')
| -rw-r--r-- | test/Transforms/InstCombine/intrinsics.ll | 20 |
1 files changed, 13 insertions, 7 deletions
diff --git a/test/Transforms/InstCombine/intrinsics.ll b/test/Transforms/InstCombine/intrinsics.ll index 7ae6d5a969..382e6b3857 100644 --- a/test/Transforms/InstCombine/intrinsics.ll +++ b/test/Transforms/InstCombine/intrinsics.ll @@ -201,16 +201,22 @@ entry: ; CHECK-NEXT: store volatile i1 %pop.cmp, i1* %c } - -define i32 @cttz_simplify1(i32 %x) nounwind readnone ssp { - %tmp1 = tail call i32 @llvm.ctlz.i32(i32 %x, i1 false) ; <i32> [#uses=1] - %shr3 = lshr i32 %tmp1, 5 ; <i32> [#uses=1] +define i32 @cttz_simplify1a(i32 %x) nounwind readnone ssp { + %tmp1 = tail call i32 @llvm.ctlz.i32(i32 %x, i1 false) + %shr3 = lshr i32 %tmp1, 5 ret i32 %shr3 - -; CHECK: @cttz_simplify1 + +; CHECK: @cttz_simplify1a ; CHECK: icmp eq i32 %x, 0 -; CHECK-NEXT: zext i1 +; CHECK-NEXT: zext i1 ; CHECK-NEXT: ret i32 } +define i32 @cttz_simplify1b(i32 %x) nounwind readnone ssp { + %tmp1 = tail call i32 @llvm.ctlz.i32(i32 %x, i1 true) + %shr3 = lshr i32 %tmp1, 5 + ret i32 %shr3 +; CHECK: @cttz_simplify1b +; CHECK-NEXT: ret i32 0 +} |