8060 – xmmstore cannot allocate store for optimized operation that uses int and floats

float invSqrt(float x) {
 union fi {
	float f;
	int i;
 }
 fi v;
 float xhalf = 0.5f * x;
 v.f = x;
 v.i = 0x5f375a86 - (v.i >> 1);
 float y = x * v.f;
 float z = y*(1.5f - xhalf * y * y);
 return z;
}
or
float invSqrt(float x) {
 float xhalf = 0.5f * x;
 int i = *cast(int*)&x;
 i = 0x5f375a86 - (i >> 1);
 x = *cast(float*)&i;
 x = x*(1.5f - xhalf * x * x);
 return x;
}
fails with error
tym = xa
Internal error: ../ztc/cgxmm.c 567
when compiled with dmd 1.074 or 2.059 with -O

well probably the optimizer should not expect such a thing to be possible.

Reduced test case. The float needs to be a parameter (not a local variable).
float bug8060(float x) {
 int i = *cast(int*)&x;
 ++i;
 return *cast(float*)&i;
}

Commit pushed to master at https://github.com/D-Programming-Language/dmd
https://github.com/D-Programming-Language/dmd/commit/70a0d0398810d7da989f778a2b4a3ab1037061dd
fix Issue 8060 - xmmstore cannot allocate store for optimized operation that uses int and floats

Commit pushed to dmd-1.x at https://github.com/D-Programming-Language/dmd
https://github.com/D-Programming-Language/dmd/commit/cb946cd258a186f09cbaa303d1ded96a8ebb095d
fix Issue 8060 - xmmstore cannot allocate store for optimized operation that uses int and floats