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| author | Roman Lebedev <lebedev.ri@gmail.com> | 2018-07-14 20:08:26 +0000 |
|---|---|---|
| committer | Roman Lebedev <lebedev.ri@gmail.com> | 2018-07-14 20:08:26 +0000 |
| commit | 1e61e358a4ed048c3900c32dc84a2665c592cc4c (patch) | |
| tree | ba5ab990b610515db09fca9e5bc26b13cc0fa5fd /llvm/test/Transforms | |
| parent | f1a351cf3a36091428bd65e2ab6a7605c183cbbf (diff) | |
| download | bcm5719-llvm-1e61e358a4ed048c3900c32dc84a2665c592cc4c.tar.gz bcm5719-llvm-1e61e358a4ed048c3900c32dc84a2665c592cc4c.zip | |
[InstCombine] Fold x s<= x & (-1 >> y) to x s<= (-1 >> y)
https://bugs.llvm.org/show_bug.cgi?id=38123
https://rise4fun.com/Alive/I3O
This pattern is not commutative!
We must make sure not to fold the commuted version!
llvm-svn: 337107
Diffstat (limited to 'llvm/test/Transforms')
| -rw-r--r-- | llvm/test/Transforms/InstCombine/canonicalize-constant-low-bit-mask-and-icmp-sle-to-icmp-sle.ll | 34 |
1 files changed, 14 insertions, 20 deletions
diff --git a/llvm/test/Transforms/InstCombine/canonicalize-constant-low-bit-mask-and-icmp-sle-to-icmp-sle.ll b/llvm/test/Transforms/InstCombine/canonicalize-constant-low-bit-mask-and-icmp-sle-to-icmp-sle.ll index 6c9b9edf85b..11596fc7540 100644 --- a/llvm/test/Transforms/InstCombine/canonicalize-constant-low-bit-mask-and-icmp-sle-to-icmp-sle.ll +++ b/llvm/test/Transforms/InstCombine/canonicalize-constant-low-bit-mask-and-icmp-sle-to-icmp-sle.ll @@ -22,9 +22,8 @@ declare <3 x i8> @gen3x8() define i1 @p0() { ; CHECK-LABEL: @p0( ; CHECK-NEXT: [[X:%.*]] = call i8 @gen8() -; CHECK-NEXT: [[TMP0:%.*]] = and i8 [[X]], 3 -; CHECK-NEXT: [[RET:%.*]] = icmp sle i8 [[X]], [[TMP0]] -; CHECK-NEXT: ret i1 [[RET]] +; CHECK-NEXT: [[TMP1:%.*]] = icmp slt i8 [[X]], 4 +; CHECK-NEXT: ret i1 [[TMP1]] ; %x = call i8 @gen8() %tmp0 = and i8 %x, 3 @@ -36,9 +35,8 @@ define i1 @pv(i8 %y) { ; CHECK-LABEL: @pv( ; CHECK-NEXT: [[X:%.*]] = call i8 @gen8() ; CHECK-NEXT: [[TMP0:%.*]] = lshr i8 -1, [[Y:%.*]] -; CHECK-NEXT: [[TMP1:%.*]] = and i8 [[TMP0]], [[X]] -; CHECK-NEXT: [[RET:%.*]] = icmp sle i8 [[X]], [[TMP1]] -; CHECK-NEXT: ret i1 [[RET]] +; CHECK-NEXT: [[TMP1:%.*]] = icmp sle i8 [[X]], [[TMP0]] +; CHECK-NEXT: ret i1 [[TMP1]] ; %x = call i8 @gen8() %tmp0 = lshr i8 -1, %y @@ -54,9 +52,8 @@ define i1 @pv(i8 %y) { define <2 x i1> @p1_vec_splat() { ; CHECK-LABEL: @p1_vec_splat( ; CHECK-NEXT: [[X:%.*]] = call <2 x i8> @gen2x8() -; CHECK-NEXT: [[TMP0:%.*]] = and <2 x i8> [[X]], <i8 3, i8 3> -; CHECK-NEXT: [[RET:%.*]] = icmp sle <2 x i8> [[X]], [[TMP0]] -; CHECK-NEXT: ret <2 x i1> [[RET]] +; CHECK-NEXT: [[TMP1:%.*]] = icmp slt <2 x i8> [[X]], <i8 4, i8 4> +; CHECK-NEXT: ret <2 x i1> [[TMP1]] ; %x = call <2 x i8> @gen2x8() %tmp0 = and <2 x i8> %x, <i8 3, i8 3> @@ -67,9 +64,8 @@ define <2 x i1> @p1_vec_splat() { define <2 x i1> @p2_vec_nonsplat() { ; CHECK-LABEL: @p2_vec_nonsplat( ; CHECK-NEXT: [[X:%.*]] = call <2 x i8> @gen2x8() -; CHECK-NEXT: [[TMP0:%.*]] = and <2 x i8> [[X]], <i8 3, i8 15> -; CHECK-NEXT: [[RET:%.*]] = icmp sle <2 x i8> [[X]], [[TMP0]] -; CHECK-NEXT: ret <2 x i1> [[RET]] +; CHECK-NEXT: [[TMP1:%.*]] = icmp slt <2 x i8> [[X]], <i8 4, i8 16> +; CHECK-NEXT: ret <2 x i1> [[TMP1]] ; %x = call <2 x i8> @gen2x8() %tmp0 = and <2 x i8> %x, <i8 3, i8 15> ; doesn't have to be splat. @@ -80,9 +76,8 @@ define <2 x i1> @p2_vec_nonsplat() { define <3 x i1> @p3_vec_splat_undef() { ; CHECK-LABEL: @p3_vec_splat_undef( ; CHECK-NEXT: [[X:%.*]] = call <3 x i8> @gen3x8() -; CHECK-NEXT: [[TMP0:%.*]] = and <3 x i8> [[X]], <i8 3, i8 undef, i8 3> -; CHECK-NEXT: [[RET:%.*]] = icmp sle <3 x i8> [[X]], [[TMP0]] -; CHECK-NEXT: ret <3 x i1> [[RET]] +; CHECK-NEXT: [[TMP1:%.*]] = icmp slt <3 x i8> [[X]], <i8 4, i8 undef, i8 4> +; CHECK-NEXT: ret <3 x i1> [[TMP1]] ; %x = call <3 x i8> @gen3x8() %tmp0 = and <3 x i8> %x, <i8 3, i8 undef, i8 3> @@ -101,8 +96,8 @@ define i1 @oneuse0() { ; CHECK-NEXT: [[X:%.*]] = call i8 @gen8() ; CHECK-NEXT: [[TMP0:%.*]] = and i8 [[X]], 3 ; CHECK-NEXT: call void @use8(i8 [[TMP0]]) -; CHECK-NEXT: [[RET:%.*]] = icmp sle i8 [[X]], [[TMP0]] -; CHECK-NEXT: ret i1 [[RET]] +; CHECK-NEXT: [[TMP1:%.*]] = icmp slt i8 [[X]], 4 +; CHECK-NEXT: ret i1 [[TMP1]] ; %x = call i8 @gen8() %tmp0 = and i8 %x, 3 @@ -139,9 +134,8 @@ define i1 @cv0_GOOD(i8 %y) { ; CHECK-LABEL: @cv0_GOOD( ; CHECK-NEXT: [[X:%.*]] = call i8 @gen8() ; CHECK-NEXT: [[TMP0:%.*]] = lshr i8 -1, [[Y:%.*]] -; CHECK-NEXT: [[TMP1:%.*]] = and i8 [[TMP0]], [[X]] -; CHECK-NEXT: [[RET:%.*]] = icmp sle i8 [[X]], [[TMP1]] -; CHECK-NEXT: ret i1 [[RET]] +; CHECK-NEXT: [[TMP1:%.*]] = icmp sle i8 [[X]], [[TMP0]] +; CHECK-NEXT: ret i1 [[TMP1]] ; %x = call i8 @gen8() %tmp0 = lshr i8 -1, %y |
