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llvm-project/clang/test/CodeGen/ffp-model.c

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Making the code compliant to the documentation about Floating Point support default values for C/C++. FPP-MODEL=PRECISE enables FFP-CONTRACT(FMA is enabled). Fix for https://bugs.llvm.org/show_bug.cgi?id=50222
2021-11-09 22:35:25 +08:00
// REQUIRES: x86-registered-target
// RUN: %clang -S -emit-llvm -ffp-model=fast -emit-llvm %s -o - \
// RUN: | FileCheck %s --check-prefixes=CHECK,CHECK-FAST
// RUN: %clang -S -emit-llvm -ffp-model=precise %s -o - \
// RUN: | FileCheck %s --check-prefixes=CHECK,CHECK-PRECISE
// RUN: %clang -S -emit-llvm -ffp-model=strict %s -o - \
// RUN: -target x86_64 | FileCheck %s --check-prefixes=CHECK,CHECK-STRICT
// RUN: %clang -S -emit-llvm -ffp-model=strict -ffast-math \
// RUN: -target x86_64 %s -o - | FileCheck %s \
// RUN: --check-prefixes CHECK,CHECK-STRICT-FAST
// RUN: %clang -S -emit-llvm -ffp-model=precise -ffast-math \
// RUN: %s -o - | FileCheck %s --check-prefixes CHECK,CHECK-FAST1
float mymuladd(float x, float y, float z) {
// CHECK: define{{.*}} float @mymuladd
return x * y + z;
// CHECK-FAST: fmul fast float
// CHECK-FAST: load float, float*
// CHECK-FAST: fadd fast float
// CHECK-PRECISE: load float, float*
// CHECK-PRECISE: load float, float*
// CHECK-PRECISE: load float, float*
// CHECK-PRECISE: call float @llvm.fmuladd.f32(float {{.*}}, float {{.*}}, float {{.*}})
// CHECK-STRICT: load float, float*
// CHECK-STRICT: load float, float*
// CHECK-STRICT: call float @llvm.experimental.constrained.fmul.f32(float {{.*}}, float {{.*}}, {{.*}})
// CHECK-STRICT: load float, float*
// CHECK-STRICT: call float @llvm.experimental.constrained.fadd.f32(float {{.*}}, float {{.*}}, {{.*}})
// CHECK-STRICT-FAST: load float, float*
// CHECK-STRICT-FAST: load float, float*
// CHECK-STRICT-FAST: call fast float @llvm.experimental.constrained.fmul.f32(float {{.*}}, float {{.*}}, {{.*}})
// CHECK-STRICT-FAST: load float, float*
// CHECK-STRICT-FAST: call fast float @llvm.experimental.constrained.fadd.f32(float {{.*}}, float {{.*}}, {{.*}}
// CHECK-FAST1: load float, float*
// CHECK-FAST1: load float, float*
// CHECK-FAST1: fmul fast float {{.*}}, {{.*}}
// CHECK-FAST1: load float, float* {{.*}}
// CHECK-FAST1: fadd fast float {{.*}}, {{.*}}
}