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[InstSimplify] Simplify smul.fix and smul.fix.sat
Add simplification of smul.fix and smul.fix.sat according to X * 0 -> 0 X * undef -> 0 X * (1 << scale) -> X This includes the commuted patterns and splatted vectors. Reviewed By: nikic Differential Revision: https://reviews.llvm.org/D98299
This commit is contained in:
Bjorn Pettersson
parent
5d0c366826
commit
bcace0dff8
@ -5747,6 +5747,36 @@ static Value *simplifyIntrinsic(CallBase *Call, const SimplifyQuery &Q) {
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return V;
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return nullptr;
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}
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case Intrinsic::smul_fix:
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case Intrinsic::smul_fix_sat: {
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Value *Op0 = Call->getArgOperand(0);
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Value *Op1 = Call->getArgOperand(1);
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Value *Op2 = Call->getArgOperand(2);
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Type *ReturnType = F->getReturnType();
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// Canonicalize constant operand as Op1 (ConstantFolding handles the case
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// when both Op0 and Op1 are constant so we do not care about that special
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// case here).
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if (isa<Constant>(Op0))
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std::swap(Op0, Op1);
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// X * 0 -> 0
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if (match(Op1, m_Zero()))
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return Constant::getNullValue(ReturnType);
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// X * undef -> 0
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if (Q.isUndefValue(Op1))
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return Constant::getNullValue(ReturnType);
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// X * (1 << Scale) -> X
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APInt ScaledOne =
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APInt::getOneBitSet(ReturnType->getScalarSizeInBits(),
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cast<ConstantInt>(Op2)->getZExtValue());
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if (ScaledOne.isNonNegative() && match(Op1, m_SpecificInt(ScaledOne)))
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return Op0;
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return nullptr;
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}
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default:
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return nullptr;
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}
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239
test/Transforms/InstSimplify/smul_fix.ll
Normal file
239
test/Transforms/InstSimplify/smul_fix.ll
Normal file
@ -0,0 +1,239 @@
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -S -instsimplify | FileCheck %s
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declare i16 @llvm.smul.fix.i16(i16, i16, i32)
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declare i16 @llvm.smul.fix.sat.i16(i16, i16, i32)
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declare <2 x i16> @llvm.smul.fix.v2i16(<2 x i16>, <2 x i16>, i32)
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declare <2 x i16> @llvm.smul.fix.sat.v2i16(<2 x i16>, <2 x i16>, i32)
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;;
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;; llvm.smul.fix (scalar)
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;;
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; X * 0 -> X
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define i16 @smul_fix_0(i16 %arg) {
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; CHECK-LABEL: @smul_fix_0(
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; CHECK-NEXT: ret i16 0
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;
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%res = call i16 @llvm.smul.fix.i16(i16 %arg, i16 0, i32 15)
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ret i16 %res
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}
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; 0 * X -> X
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define i16 @smul_fix_1(i16 %arg) {
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; CHECK-LABEL: @smul_fix_1(
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; CHECK-NEXT: ret i16 0
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;
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%res = call i16 @llvm.smul.fix.i16(i16 0, i16 %arg, i32 15)
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ret i16 %res
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}
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; X * undef -> undef
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define i16 @smul_fix_2(i16 %arg) {
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; CHECK-LABEL: @smul_fix_2(
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; CHECK-NEXT: ret i16 0
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;
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%res = call i16 @llvm.smul.fix.i16(i16 %arg, i16 undef, i32 15)
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ret i16 %res
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}
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; undef * X -> undef
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define i16 @smul_fix_3(i16 %arg) {
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; CHECK-LABEL: @smul_fix_3(
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; CHECK-NEXT: ret i16 0
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;
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%res = call i16 @llvm.smul.fix.i16(i16 undef, i16 %arg, i32 15)
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ret i16 %res
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}
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; X * 1 -> X
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define i16 @smul_fix_4(i16 %arg) {
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; CHECK-LABEL: @smul_fix_4(
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; CHECK-NEXT: ret i16 [[ARG:%.*]]
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;
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%res = call i16 @llvm.smul.fix.i16(i16 %arg, i16 16384, i32 14)
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ret i16 %res
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}
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; 1 * X -> X
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define i16 @smul_fix_5(i16 %arg) {
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; CHECK-LABEL: @smul_fix_5(
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; CHECK-NEXT: ret i16 [[ARG:%.*]]
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;
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%res = call i16 @llvm.smul.fix.i16(i16 2, i16 %arg, i32 1)
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ret i16 %res
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}
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;;
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;; llvm.smul.fix.sat (scalar)
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;;
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; X * 0 -> X
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define i16 @smul_fix_sat_0(i16 %arg) {
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; CHECK-LABEL: @smul_fix_sat_0(
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; CHECK-NEXT: ret i16 0
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;
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%res = call i16 @llvm.smul.fix.sat.i16(i16 %arg, i16 0, i32 15)
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ret i16 %res
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}
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; 0 * X -> X
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define i16 @smul_fix_sat_1(i16 %arg) {
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; CHECK-LABEL: @smul_fix_sat_1(
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; CHECK-NEXT: ret i16 0
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;
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%res = call i16 @llvm.smul.fix.sat.i16(i16 0, i16 %arg, i32 15)
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ret i16 %res
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}
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; X * undef -> undef
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define i16 @smul_fix_sat_2(i16 %arg) {
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; CHECK-LABEL: @smul_fix_sat_2(
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; CHECK-NEXT: ret i16 0
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;
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%res = call i16 @llvm.smul.fix.sat.i16(i16 %arg, i16 undef, i32 15)
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ret i16 %res
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}
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; undef * X -> undef
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define i16 @smul_fix_sat_3(i16 %arg) {
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; CHECK-LABEL: @smul_fix_sat_3(
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; CHECK-NEXT: ret i16 0
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;
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%res = call i16 @llvm.smul.fix.sat.i16(i16 undef, i16 %arg, i32 15)
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ret i16 %res
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}
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; X * 1 -> X
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define i16 @smul_fix_sat_4(i16 %arg) {
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; CHECK-LABEL: @smul_fix_sat_4(
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; CHECK-NEXT: ret i16 [[ARG:%.*]]
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;
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%res = call i16 @llvm.smul.fix.sat.i16(i16 %arg, i16 16384, i32 14)
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ret i16 %res
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}
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; 1 * X -> X
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define i16 @smul_fix_sat_5(i16 %arg) {
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; CHECK-LABEL: @smul_fix_sat_5(
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; CHECK-NEXT: ret i16 [[ARG:%.*]]
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;
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%res = call i16 @llvm.smul.fix.sat.i16(i16 2, i16 %arg, i32 1)
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ret i16 %res
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}
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;;
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;; llvm.smul.fix (vector)
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;;
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; X * 0 -> X
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define <2 x i16> @smul_fix_vec_0(<2 x i16> %arg) {
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; CHECK-LABEL: @smul_fix_vec_0(
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; CHECK-NEXT: ret <2 x i16> zeroinitializer
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;
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%res = call <2 x i16> @llvm.smul.fix.v2i16(<2 x i16> %arg, <2 x i16> zeroinitializer, i32 15)
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ret <2 x i16> %res
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}
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; 0 * X -> X
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define <2 x i16> @smul_fix_vec_1(<2 x i16> %arg) {
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; CHECK-LABEL: @smul_fix_vec_1(
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; CHECK-NEXT: ret <2 x i16> zeroinitializer
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;
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%res = call <2 x i16> @llvm.smul.fix.v2i16(<2 x i16> zeroinitializer, <2 x i16> %arg, i32 15)
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ret <2 x i16> %res
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}
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; X * undef -> undef
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define <2 x i16> @smul_fix_vec_2(<2 x i16> %arg) {
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; CHECK-LABEL: @smul_fix_vec_2(
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; CHECK-NEXT: ret <2 x i16> zeroinitializer
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;
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%res = call <2 x i16> @llvm.smul.fix.v2i16(<2 x i16> %arg, <2 x i16> undef, i32 15)
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ret <2 x i16> %res
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}
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; undef * X -> undef
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define <2 x i16> @smul_fix_vec_3(<2 x i16> %arg) {
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; CHECK-LABEL: @smul_fix_vec_3(
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; CHECK-NEXT: ret <2 x i16> zeroinitializer
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;
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%res = call <2 x i16> @llvm.smul.fix.v2i16(<2 x i16> undef, <2 x i16> %arg, i32 15)
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ret <2 x i16> %res
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}
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; X * 1 -> X
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define <2 x i16> @smul_fix_vec_4(<2 x i16> %arg) {
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; CHECK-LABEL: @smul_fix_vec_4(
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; CHECK-NEXT: ret <2 x i16> [[ARG:%.*]]
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;
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%res = call <2 x i16> @llvm.smul.fix.v2i16(<2 x i16> %arg, <2 x i16> <i16 16384, i16 16384>, i32 14)
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ret <2 x i16> %res
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}
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; 1 * X -> X
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define <2 x i16> @smul_fix_vec_5(<2 x i16> %arg) {
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; CHECK-LABEL: @smul_fix_vec_5(
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; CHECK-NEXT: ret <2 x i16> [[ARG:%.*]]
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;
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%res = call <2 x i16> @llvm.smul.fix.v2i16(<2 x i16> <i16 2, i16 2>, <2 x i16> %arg, i32 1)
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ret <2 x i16> %res
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}
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;;
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;; llvm.smul.fix.sat (vector)
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;;
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; X * 0 -> X
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define <2 x i16> @smul_fix_sat_vec_0(<2 x i16> %arg) {
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; CHECK-LABEL: @smul_fix_sat_vec_0(
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; CHECK-NEXT: ret <2 x i16> zeroinitializer
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;
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%res = call <2 x i16> @llvm.smul.fix.sat.v2i16(<2 x i16> %arg, <2 x i16> zeroinitializer, i32 15)
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ret <2 x i16> %res
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}
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; 0 * X -> X
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define <2 x i16> @smul_fix_sat_vec_1(<2 x i16> %arg) {
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; CHECK-LABEL: @smul_fix_sat_vec_1(
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; CHECK-NEXT: ret <2 x i16> zeroinitializer
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;
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%res = call <2 x i16> @llvm.smul.fix.sat.v2i16(<2 x i16> zeroinitializer, <2 x i16> %arg, i32 15)
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ret <2 x i16> %res
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}
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; X * undef -> undef
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define <2 x i16> @smul_fix_sat_vec_2(<2 x i16> %arg) {
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; CHECK-LABEL: @smul_fix_sat_vec_2(
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; CHECK-NEXT: ret <2 x i16> zeroinitializer
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;
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%res = call <2 x i16> @llvm.smul.fix.sat.v2i16(<2 x i16> %arg, <2 x i16> undef, i32 15)
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ret <2 x i16> %res
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}
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; undef * X -> undef
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define <2 x i16> @smul_fix_sat_vec_3(<2 x i16> %arg) {
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; CHECK-LABEL: @smul_fix_sat_vec_3(
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; CHECK-NEXT: ret <2 x i16> zeroinitializer
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;
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%res = call <2 x i16> @llvm.smul.fix.sat.v2i16(<2 x i16> undef, <2 x i16> %arg, i32 15)
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ret <2 x i16> %res
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}
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; X * 1 -> X
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define <2 x i16> @smul_fix_sat_vec_4(<2 x i16> %arg) {
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; CHECK-LABEL: @smul_fix_sat_vec_4(
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; CHECK-NEXT: ret <2 x i16> [[ARG:%.*]]
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;
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%res = call <2 x i16> @llvm.smul.fix.sat.v2i16(<2 x i16> %arg, <2 x i16> <i16 16384, i16 16384>, i32 14)
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ret <2 x i16> %res
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}
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; 1 * X -> X
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define <2 x i16> @smul_fix_sat_vec_5(<2 x i16> %arg) {
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; CHECK-LABEL: @smul_fix_sat_vec_5(
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; CHECK-NEXT: ret <2 x i16> [[ARG:%.*]]
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;
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%res = call <2 x i16> @llvm.smul.fix.sat.v2i16(<2 x i16> <i16 2, i16 2>, <2 x i16> %arg, i32 1)
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ret <2 x i16> %res
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}
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