diff options
| -rw-r--r-- | llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp | 6 | ||||
| -rw-r--r-- | llvm/test/Transforms/InstCombine/canonicalize-constant-low-bit-mask-and-icmp-sge-to-icmp-sle.ll | 34 |
2 files changed, 20 insertions, 20 deletions
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp b/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp index 9bd5d53382e..b43520d9e92 100644 --- a/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp +++ b/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp @@ -2918,6 +2918,12 @@ static Value *foldICmpWithLowBitMaskedVal(ICmpInst &I, return nullptr; // Ignore the other case. DstPred = ICmpInst::Predicate::ICMP_SGT; break; + case ICmpInst::Predicate::ICMP_SGE: + // x & (-1 >> y) s>= x -> x s<= (-1 >> y) + if (X != I.getOperand(1)) // X must be on RHS of comparison! + return nullptr; // Ignore the other case. + DstPred = ICmpInst::Predicate::ICMP_SLE; + break; case ICmpInst::Predicate::ICMP_SLE: // x s<= x & (-1 >> y) -> x s<= (-1 >> y) if (X != I.getOperand(0)) // X must be on LHS of comparison! diff --git a/llvm/test/Transforms/InstCombine/canonicalize-constant-low-bit-mask-and-icmp-sge-to-icmp-sle.ll b/llvm/test/Transforms/InstCombine/canonicalize-constant-low-bit-mask-and-icmp-sge-to-icmp-sle.ll index 802488d16f2..7be784a452f 100644 --- a/llvm/test/Transforms/InstCombine/canonicalize-constant-low-bit-mask-and-icmp-sge-to-icmp-sle.ll +++ b/llvm/test/Transforms/InstCombine/canonicalize-constant-low-bit-mask-and-icmp-sge-to-icmp-sle.ll @@ -15,9 +15,8 @@ define i1 @p0(i8 %x) { ; CHECK-LABEL: @p0( -; CHECK-NEXT: [[TMP0:%.*]] = and i8 [[X:%.*]], 3 -; CHECK-NEXT: [[RET:%.*]] = icmp sge i8 [[TMP0]], [[X]] -; CHECK-NEXT: ret i1 [[RET]] +; CHECK-NEXT: [[TMP1:%.*]] = icmp slt i8 [[X:%.*]], 4 +; CHECK-NEXT: ret i1 [[TMP1]] ; %tmp0 = and i8 %x, 3 %ret = icmp sge i8 %tmp0, %x @@ -27,9 +26,8 @@ define i1 @p0(i8 %x) { define i1 @pv(i8 %x, i8 %y) { ; CHECK-LABEL: @pv( ; CHECK-NEXT: [[TMP0:%.*]] = lshr i8 -1, [[Y:%.*]] -; CHECK-NEXT: [[TMP1:%.*]] = and i8 [[TMP0]], [[X:%.*]] -; CHECK-NEXT: [[RET:%.*]] = icmp sge i8 [[TMP1]], [[X]] -; CHECK-NEXT: ret i1 [[RET]] +; CHECK-NEXT: [[TMP1:%.*]] = icmp sge i8 [[TMP0]], [[X:%.*]] +; CHECK-NEXT: ret i1 [[TMP1]] ; %tmp0 = lshr i8 -1, %y %tmp1 = and i8 %tmp0, %x @@ -43,9 +41,8 @@ define i1 @pv(i8 %x, i8 %y) { define <2 x i1> @p1_vec_splat(<2 x i8> %x) { ; CHECK-LABEL: @p1_vec_splat( -; CHECK-NEXT: [[TMP0:%.*]] = and <2 x i8> [[X:%.*]], <i8 3, i8 3> -; CHECK-NEXT: [[RET:%.*]] = icmp sge <2 x i8> [[TMP0]], [[X]] -; 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]] ; %tmp0 = and <2 x i8> %x, <i8 3, i8 3> %ret = icmp sge <2 x i8> %tmp0, %x @@ -54,9 +51,8 @@ define <2 x i1> @p1_vec_splat(<2 x i8> %x) { define <2 x i1> @p2_vec_nonsplat(<2 x i8> %x) { ; CHECK-LABEL: @p2_vec_nonsplat( -; CHECK-NEXT: [[TMP0:%.*]] = and <2 x i8> [[X:%.*]], <i8 3, i8 15> -; CHECK-NEXT: [[RET:%.*]] = icmp sge <2 x i8> [[TMP0]], [[X]] -; 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]] ; %tmp0 = and <2 x i8> %x, <i8 3, i8 15> ; doesn't have to be splat. %ret = icmp sge <2 x i8> %tmp0, %x @@ -65,9 +61,8 @@ define <2 x i1> @p2_vec_nonsplat(<2 x i8> %x) { define <3 x i1> @p3_vec_splat_undef(<3 x i8> %x) { ; CHECK-LABEL: @p3_vec_splat_undef( -; CHECK-NEXT: [[TMP0:%.*]] = and <3 x i8> [[X:%.*]], <i8 3, i8 undef, i8 3> -; CHECK-NEXT: [[RET:%.*]] = icmp sge <3 x i8> [[TMP0]], [[X]] -; 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]] ; %tmp0 = and <3 x i8> %x, <i8 3, i8 undef, i8 3> %ret = icmp sge <3 x i8> %tmp0, %x @@ -84,8 +79,8 @@ define i1 @oneuse0(i8 %x) { ; CHECK-LABEL: @oneuse0( ; CHECK-NEXT: [[TMP0:%.*]] = and i8 [[X:%.*]], 3 ; CHECK-NEXT: call void @use8(i8 [[TMP0]]) -; CHECK-NEXT: [[RET:%.*]] = icmp sge i8 [[TMP0]], [[X]] -; CHECK-NEXT: ret i1 [[RET]] +; CHECK-NEXT: [[TMP1:%.*]] = icmp slt i8 [[X]], 4 +; CHECK-NEXT: ret i1 [[TMP1]] ; %tmp0 = and i8 %x, 3 call void @use8(i8 %tmp0) @@ -125,9 +120,8 @@ define i1 @cv0(i8 %y) { ; CHECK-LABEL: @cv0( ; CHECK-NEXT: [[X:%.*]] = call i8 @gen8() ; CHECK-NEXT: [[TMP0:%.*]] = lshr i8 -1, [[Y:%.*]] -; CHECK-NEXT: [[TMP1:%.*]] = and i8 [[X]], [[TMP0]] -; CHECK-NEXT: [[RET:%.*]] = icmp sge i8 [[TMP1]], [[X]] -; 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 |
