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| author | Sanjay Patel <spatel@rotateright.com> | 2021-03-12 14:15:27 -0500 |
|---|---|---|
| committer | Tom Stellard <tstellar@redhat.com> | 2021-03-30 14:28:11 -0700 |
| commit | 5b3480610383ba281ef0c7918a6c097058a408d4 (patch) | |
| tree | ebab754016c01d2858802d03e00446677014cf43 | |
| parent | 38dd45b00431e2c065e172751492e0ded59e49e6 (diff) | |
| download | llvm-5b3480610383ba281ef0c7918a6c097058a408d4.zip llvm-5b3480610383ba281ef0c7918a6c097058a408d4.tar.gz llvm-5b3480610383ba281ef0c7918a6c097058a408d4.tar.bz2 | |
[InstCombine] add test for zext-of-icmps; NFC
PR49475 shows an infinite loop outcome, but this
tries to show the root cause with a minimal test.
(cherry picked from commit 579b8fc2e97c489308f97b01d13d894c03c0a16c)
| -rw-r--r-- | llvm/test/Transforms/InstCombine/zext-or-icmp.ll | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/llvm/test/Transforms/InstCombine/zext-or-icmp.ll b/llvm/test/Transforms/InstCombine/zext-or-icmp.ll index a77aa7a..54ae085 100644 --- a/llvm/test/Transforms/InstCombine/zext-or-icmp.ll +++ b/llvm/test/Transforms/InstCombine/zext-or-icmp.ll @@ -106,3 +106,23 @@ block2: %conv2 = zext i1 %cmp1 to i32 ret i32 %conv2 } + +; FIXME: This should not end with more instructions than it started from. + +define i32 @PR49475(i32 %x, i16 %y) { +; CHECK-LABEL: @PR49475( +; CHECK-NEXT: [[M:%.*]] = and i16 [[Y:%.*]], 1 +; CHECK-NEXT: [[B1:%.*]] = icmp eq i32 [[X:%.*]], 0 +; CHECK-NEXT: [[B11:%.*]] = zext i1 [[B1]] to i32 +; CHECK-NEXT: [[TMP1:%.*]] = xor i16 [[M]], 1 +; CHECK-NEXT: [[TMP2:%.*]] = zext i16 [[TMP1]] to i32 +; CHECK-NEXT: [[Z3:%.*]] = or i32 [[B11]], [[TMP2]] +; CHECK-NEXT: ret i32 [[Z3]] +; + %m = and i16 %y, 1 + %b1 = icmp eq i32 %x, 0 + %b2 = icmp eq i16 %m, 0 + %t1 = or i1 %b1, %b2 + %z = zext i1 %t1 to i32 + ret i32 %z +} |