forked from OSchip/llvm-project
[ConstProp] allow folding for fma that produces NaN
Folding for fma/fmuladd was added here:
rL202914
...and as seen in existing/unchanged tests, that works to propagate NaN
if it's already an input, but we should fold an fma() that creates NaN too.
From IEEE-754-2008 7.2 "Invalid Operation", there are 2 clauses that apply
to fma, so I added tests for those patterns:
c) fusedMultiplyAdd: fusedMultiplyAdd(0, ∞, c) or fusedMultiplyAdd(∞, 0, c)
unless c is a quiet NaN; if c is a quiet NaN then it is implementation
defined whether the invalid operation exception is signaled
d) addition or subtraction or fusedMultiplyAdd: magnitude subtraction of
infinities, such as: addition(+∞, −∞)
Differential Revision: https://reviews.llvm.org/D67446
llvm-svn: 371735
This commit is contained in:
Sanjay Patel
parent
03a111dc46
commit
3f5a808365
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@ -192,6 +192,11 @@ struct APFloatBase {
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/// IEEE-754R 7: Default exception handling.
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///
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/// opUnderflow or opOverflow are always returned or-ed with opInexact.
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///
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/// APFloat models this behavior specified by IEEE-754:
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/// "For operations producing results in floating-point format, the default
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/// result of an operation that signals the invalid operation exception
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/// shall be a quiet NaN."
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enum opStatus {
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opOK = 0x00,
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opInvalidOp = 0x01,
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@ -2243,13 +2243,9 @@ static Constant *ConstantFoldScalarCall3(StringRef Name,
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case Intrinsic::fma:
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case Intrinsic::fmuladd: {
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APFloat V = Op1->getValueAPF();
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APFloat::opStatus s = V.fusedMultiplyAdd(Op2->getValueAPF(),
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Op3->getValueAPF(),
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APFloat::rmNearestTiesToEven);
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if (s != APFloat::opInvalidOp)
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return ConstantFP::get(Ty->getContext(), V);
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return nullptr;
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V.fusedMultiplyAdd(Op2->getValueAPF(), Op3->getValueAPF(),
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APFloat::rmNearestTiesToEven);
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return ConstantFP::get(Ty->getContext(), V);
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}
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}
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}
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@ -129,8 +129,7 @@ define double @test_Inf_4() {
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define double @inf_product_opposite_inf_addend_1() {
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; CHECK-LABEL: @inf_product_opposite_inf_addend_1(
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; CHECK-NEXT: [[TMP1:%.*]] = call double @llvm.fma.f64(double 7.000000e+00, double 0xFFF0000000000000, double 0x7FF0000000000000)
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; CHECK-NEXT: ret double [[TMP1]]
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; CHECK-NEXT: ret double 0x7FF8000000000000
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;
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%1 = call double @llvm.fma.f64(double 7.0, double 0xFFF0000000000000, double 0x7FF0000000000000)
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ret double %1
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@ -140,8 +139,7 @@ define double @inf_product_opposite_inf_addend_1() {
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define double @inf_product_opposite_inf_addend_2() {
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; CHECK-LABEL: @inf_product_opposite_inf_addend_2(
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; CHECK-NEXT: [[TMP1:%.*]] = call double @llvm.fma.f64(double 7.000000e+00, double 0x7FF0000000000000, double 0xFFF0000000000000)
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; CHECK-NEXT: ret double [[TMP1]]
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; CHECK-NEXT: ret double 0x7FF8000000000000
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;
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%1 = call double @llvm.fma.f64(double 7.0, double 0x7FF0000000000000, double 0xFFF0000000000000)
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ret double %1
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@ -151,8 +149,7 @@ define double @inf_product_opposite_inf_addend_2() {
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define double @inf_product_opposite_inf_addend_3() {
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; CHECK-LABEL: @inf_product_opposite_inf_addend_3(
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; CHECK-NEXT: [[TMP1:%.*]] = call double @llvm.fma.f64(double 0xFFF0000000000000, double 4.200000e+01, double 0x7FF0000000000000)
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; CHECK-NEXT: ret double [[TMP1]]
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; CHECK-NEXT: ret double 0x7FF8000000000000
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;
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%1 = call double @llvm.fma.f64(double 0xFFF0000000000000, double 42.0, double 0x7FF0000000000000)
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ret double %1
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@ -162,8 +159,7 @@ define double @inf_product_opposite_inf_addend_3() {
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define double @inf_product_opposite_inf_addend_4() {
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; CHECK-LABEL: @inf_product_opposite_inf_addend_4(
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; CHECK-NEXT: [[TMP1:%.*]] = call double @llvm.fma.f64(double 0x7FF0000000000000, double 4.200000e+01, double 0xFFF0000000000000)
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; CHECK-NEXT: ret double [[TMP1]]
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; CHECK-NEXT: ret double 0x7FF8000000000000
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;
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%1 = call double @llvm.fma.f64(double 0x7FF0000000000000, double 42.0, double 0xFFF0000000000000)
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ret double %1
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@ -173,8 +169,7 @@ define double @inf_product_opposite_inf_addend_4() {
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define double @inf_times_zero_1() {
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; CHECK-LABEL: @inf_times_zero_1(
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; CHECK-NEXT: [[TMP1:%.*]] = call double @llvm.fma.f64(double 0.000000e+00, double 0xFFF0000000000000, double 4.200000e+01)
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; CHECK-NEXT: ret double [[TMP1]]
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; CHECK-NEXT: ret double 0x7FF8000000000000
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;
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%1 = call double @llvm.fma.f64(double 0.0, double 0xFFF0000000000000, double 42.0)
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ret double %1
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@ -184,8 +179,7 @@ define double @inf_times_zero_1() {
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define double @inf_times_zero_2() {
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; CHECK-LABEL: @inf_times_zero_2(
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; CHECK-NEXT: [[TMP1:%.*]] = call double @llvm.fma.f64(double 0.000000e+00, double 0x7FF0000000000000, double 4.200000e+01)
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; CHECK-NEXT: ret double [[TMP1]]
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; CHECK-NEXT: ret double 0x7FF8000000000000
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;
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%1 = call double @llvm.fma.f64(double 0.0, double 0x7FF0000000000000, double 42.0)
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ret double %1
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@ -195,8 +189,7 @@ define double @inf_times_zero_2() {
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define double @inf_times_zero_3() {
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; CHECK-LABEL: @inf_times_zero_3(
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; CHECK-NEXT: [[TMP1:%.*]] = call double @llvm.fma.f64(double 0xFFF0000000000000, double 0.000000e+00, double 4.200000e+01)
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; CHECK-NEXT: ret double [[TMP1]]
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; CHECK-NEXT: ret double 0x7FF8000000000000
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;
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%1 = call double @llvm.fma.f64(double 0xFFF0000000000000, double 0.0, double 42.0)
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ret double %1
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@ -206,8 +199,7 @@ define double @inf_times_zero_3() {
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define double @inf_times_zero_4() {
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; CHECK-LABEL: @inf_times_zero_4(
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; CHECK-NEXT: [[TMP1:%.*]] = call double @llvm.fma.f64(double 0x7FF0000000000000, double 0.000000e+00, double 4.200000e+01)
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; CHECK-NEXT: ret double [[TMP1]]
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; CHECK-NEXT: ret double 0x7FF8000000000000
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;
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%1 = call double @llvm.fma.f64(double 0x7FF0000000000000, double 0.0, double 42.0)
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ret double %1
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@ -217,8 +209,7 @@ define double @inf_times_zero_4() {
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define double @inf_times_zero_5() {
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; CHECK-LABEL: @inf_times_zero_5(
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; CHECK-NEXT: [[TMP1:%.*]] = call double @llvm.fma.f64(double -0.000000e+00, double 0xFFF0000000000000, double 4.200000e+01)
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; CHECK-NEXT: ret double [[TMP1]]
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; CHECK-NEXT: ret double 0x7FF8000000000000
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;
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%1 = call double @llvm.fma.f64(double -0.0, double 0xFFF0000000000000, double 42.0)
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ret double %1
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@ -228,8 +219,7 @@ define double @inf_times_zero_5() {
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define double @inf_times_zero_6() {
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; CHECK-LABEL: @inf_times_zero_6(
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; CHECK-NEXT: [[TMP1:%.*]] = call double @llvm.fma.f64(double -0.000000e+00, double 0x7FF0000000000000, double 4.200000e+01)
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; CHECK-NEXT: ret double [[TMP1]]
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; CHECK-NEXT: ret double 0x7FF8000000000000
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;
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%1 = call double @llvm.fma.f64(double -0.0, double 0x7FF0000000000000, double 42.0)
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ret double %1
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@ -239,8 +229,7 @@ define double @inf_times_zero_6() {
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define double @inf_times_zero_7() {
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; CHECK-LABEL: @inf_times_zero_7(
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; CHECK-NEXT: [[TMP1:%.*]] = call double @llvm.fma.f64(double 0xFFF0000000000000, double -0.000000e+00, double 4.200000e+01)
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; CHECK-NEXT: ret double [[TMP1]]
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; CHECK-NEXT: ret double 0x7FF8000000000000
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;
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%1 = call double @llvm.fma.f64(double 0xFFF0000000000000, double -0.0, double 42.0)
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ret double %1
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@ -250,10 +239,8 @@ define double @inf_times_zero_7() {
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define double @inf_times_zero_8() {
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; CHECK-LABEL: @inf_times_zero_8(
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; CHECK-NEXT: [[TMP1:%.*]] = call double @llvm.fma.f64(double 0x7FF0000000000000, double -0.000000e+00, double 4.200000e+01)
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; CHECK-NEXT: ret double [[TMP1]]
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; CHECK-NEXT: ret double 0x7FF8000000000000
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;
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%1 = call double @llvm.fma.f64(double 0x7FF0000000000000, double -0.0, double 42.0)
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ret double %1
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}
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