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| author | Sanjay Patel <spatel@rotateright.com> | 2017-01-31 17:43:00 +0000 |
|---|---|---|
| committer | Sanjay Patel <spatel@rotateright.com> | 2017-01-31 17:43:00 +0000 |
| commit | c0abce81c1985a3092beb21bad452e8bdfa271b1 (patch) | |
| tree | d4cb71ec5e6d7a97eb15e8dfdc885e17dc44d65b /llvm/test/Transforms | |
| parent | d5d78510c77bb01904b3b3ca165592eefa49255a (diff) | |
| download | bcm5719-llvm-c0abce81c1985a3092beb21bad452e8bdfa271b1.tar.gz bcm5719-llvm-c0abce81c1985a3092beb21bad452e8bdfa271b1.zip | |
[InstCombine] add test for possible zext-phi transform; NFC
The datalayout doesn't include i1, so we don't do a potential shrink and sink transform.
Example based on discussion here:
http://lists.llvm.org/pipermail/llvm-dev/2017-January/109631.html
llvm-svn: 293656
Diffstat (limited to 'llvm/test/Transforms')
| -rw-r--r-- | llvm/test/Transforms/InstCombine/zext-phi.ll | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/llvm/test/Transforms/InstCombine/zext-phi.ll b/llvm/test/Transforms/InstCombine/zext-phi.ll new file mode 100644 index 00000000000..5d64b0582f0 --- /dev/null +++ b/llvm/test/Transforms/InstCombine/zext-phi.ll @@ -0,0 +1,29 @@ +; RUN: opt < %s -instcombine -S | FileCheck %s + +target datalayout = "e-m:e-i64:64-n8:16:32:64" + +define i64 @sink_i1_casts(i1 %cond1, i1 %cond2) { +; CHECK-LABEL: @sink_i1_casts( +; CHECK-NEXT: entry: +; CHECK-NEXT: [[Z1:%.*]] = zext i1 %cond1 to i64 +; CHECK-NEXT: br i1 %cond1, label %if, label %end +; CHECK: if: +; CHECK-NEXT: [[Z2:%.*]] = zext i1 %cond2 to i64 +; CHECK-NEXT: br label %end +; CHECK: end: +; CHECK-NEXT: [[PHI:%.*]] = phi i64 [ [[Z1]], %entry ], [ [[Z2]], %if ] +; CHECK-NEXT: ret i64 [[PHI]] +; +entry: + %z1 = zext i1 %cond1 to i64 + br i1 %cond1, label %if, label %end + +if: + %z2 = zext i1 %cond2 to i64 + br label %end + +end: + %phi = phi i64 [ %z1, %entry ], [ %z2, %if ] + ret i64 %phi +} + |
