llvm-project/clang/test/CodeGen/cast-emit.c

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// RUN: %clang_cc1 -emit-llvm %s -o - | FileCheck %s
typedef union {
int i;
float f;
} MyUnion;
void unionf(MyUnion a);
void uniontest(float a) {
f((MyUnion)1.0f);
// CHECK: store float 1.000000e+00
}