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| author | Sanjay Patel <spatel@rotateright.com> | 2017-07-14 15:09:49 +0000 |
|---|---|---|
| committer | Sanjay Patel <spatel@rotateright.com> | 2017-07-14 15:09:49 +0000 |
| commit | 3f4db3ea97ddf6cc0d2bbfed88d5566e25a95b1d (patch) | |
| tree | 6726b9ae877e593bfb1ce732992fe794e9f2d43e /llvm/test/Transforms | |
| parent | 45b2277a33251927be13f96b066ca638b25b3184 (diff) | |
| download | bcm5719-llvm-3f4db3ea97ddf6cc0d2bbfed88d5566e25a95b1d.tar.gz bcm5719-llvm-3f4db3ea97ddf6cc0d2bbfed88d5566e25a95b1d.zip | |
[InstCombine] convert bitwise (in)equality checks to logical ops (PR32401)
As discussed in:
https://bugs.llvm.org/show_bug.cgi?id=32401
we have a backend transform to undo this:
https://reviews.llvm.org/rL299542
when it's likely that the xor version leads to better codegen, but we want
this form in IR for better analysis and simplification potential.
llvm-svn: 308031
Diffstat (limited to 'llvm/test/Transforms')
| -rw-r--r-- | llvm/test/Transforms/InstCombine/icmp-logical.ll | 14 |
1 files changed, 6 insertions, 8 deletions
diff --git a/llvm/test/Transforms/InstCombine/icmp-logical.ll b/llvm/test/Transforms/InstCombine/icmp-logical.ll index 248d89d934e..aa95cc5a131 100644 --- a/llvm/test/Transforms/InstCombine/icmp-logical.ll +++ b/llvm/test/Transforms/InstCombine/icmp-logical.ll @@ -157,10 +157,9 @@ define i1 @fold_mask_cmps_to_true(i32 %x) { define i1 @cmpeq_bitwise(i8 %a, i8 %b, i8 %c, i8 %d) { ; CHECK-LABEL: @cmpeq_bitwise( -; CHECK-NEXT: [[XOR1:%.*]] = xor i8 %a, %b -; CHECK-NEXT: [[XOR2:%.*]] = xor i8 %c, %d -; CHECK-NEXT: [[OR:%.*]] = or i8 [[XOR1]], [[XOR2]] -; CHECK-NEXT: [[CMP:%.*]] = icmp eq i8 [[OR]], 0 +; CHECK-NEXT: [[TMP1:%.*]] = icmp eq i8 %a, %b +; CHECK-NEXT: [[TMP2:%.*]] = icmp eq i8 %c, %d +; CHECK-NEXT: [[CMP:%.*]] = and i1 [[TMP1]], [[TMP2]] ; CHECK-NEXT: ret i1 [[CMP]] ; %xor1 = xor i8 %a, %b @@ -172,10 +171,9 @@ define i1 @cmpeq_bitwise(i8 %a, i8 %b, i8 %c, i8 %d) { define <2 x i1> @cmpne_bitwise(<2 x i64> %a, <2 x i64> %b, <2 x i64> %c, <2 x i64> %d) { ; CHECK-LABEL: @cmpne_bitwise( -; CHECK-NEXT: [[XOR1:%.*]] = xor <2 x i64> %a, %b -; CHECK-NEXT: [[XOR2:%.*]] = xor <2 x i64> %c, %d -; CHECK-NEXT: [[OR:%.*]] = or <2 x i64> [[XOR1]], [[XOR2]] -; CHECK-NEXT: [[CMP:%.*]] = icmp ne <2 x i64> [[OR]], zeroinitializer +; CHECK-NEXT: [[TMP1:%.*]] = icmp ne <2 x i64> %a, %b +; CHECK-NEXT: [[TMP2:%.*]] = icmp ne <2 x i64> %c, %d +; CHECK-NEXT: [[CMP:%.*]] = or <2 x i1> [[TMP1]], [[TMP2]] ; CHECK-NEXT: ret <2 x i1> [[CMP]] ; %xor1 = xor <2 x i64> %a, %b |
