llvm-project/clang/test/CodeGen/fast-math.c

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// RUN: %clang_cc1 -ffast-math -emit-llvm -o - %s | FileCheck %s
typedef unsigned cond_t;
volatile float f0, f1, f2;
void foo(void) {
// CHECK: define void @foo()
// CHECK: fadd fast
f0 = f1 + f2;
// CHECK: ret
}