llvm-project/clang/test/CodeGen/fp-floatcontrol-pragma.cpp

48 lines
1.2 KiB
C++

// RUN: %clang_cc1 -triple x86_64-linux-gnu -emit-llvm -o - %s | FileCheck %s
float fff(float x, float y) {
// CHECK-LABEL: define float @_Z3fffff{{.*}}
// CHECK: entry
#pragma float_control(except, on)
float z;
z = z * z;
//CHECK: llvm.experimental.constrained.fmul{{.*}}
{
z = x * y;
//CHECK: llvm.experimental.constrained.fmul{{.*}}
}
{
// This pragma has no effect since if there are any fp intrin in the
// function then all the operations need to be fp intrin
#pragma float_control(except, off)
z = z + x * y;
//CHECK: llvm.experimental.constrained.fmul{{.*}}
}
z = z * z;
//CHECK: llvm.experimental.constrained.fmul{{.*}}
return z;
}
float check_precise(float x, float y) {
// CHECK-LABEL: define float @_Z13check_preciseff{{.*}}
float z;
{
#pragma float_control(precise, on)
z = x * y + z;
//CHECK: llvm.fmuladd{{.*}}
}
{
#pragma float_control(precise, off)
z = x * y + z;
//CHECK: fmul fast float
//CHECK: fadd fast float
}
return z;
}
float fma_test1(float a, float b, float c) {
// CHECK-LABEL define float @_Z9fma_test1fff{{.*}}
#pragma float_control(precise, on)
float x = a * b + c;
//CHECK: fmuladd
return x;
}