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Fix `arm` floating-point status register code 

* Use an actual compiler definition to determine whether we have a
  floating-point unit or not.

* Use a modern (VFPU) assembly instruction to get/set the fpsr

* If we don't have an fpsr, at least zero out the return value
This commit is contained in:
Elliot Saba 2017-01-15 14:42:28 -08:00
parent c21453060d
commit d982368bec
1 changed files with 6 additions and 4 deletions
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10
include/openlibm_fenv_arm.h
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@ -69,11 +69,13 @@ extern const fenv_t __fe_dfl_env;
#if defined(__aarch64__)
#define __rfs(__fpsr) __asm __volatile("mrs %0,fpsr" : "=r" (*(__fpsr)))
#define __wfs(__fpsr) __asm __volatile("msr fpsr,%0" : : "r" (__fpsr))
#elif defined(ARM_HARD_FLOAT)
#define __rfs(__fpsr) __asm __volatile("rfs %0" : "=r" (*(__fpsr)))
#define __wfs(__fpsr) __asm __volatile("wfs %0" : : "r" (__fpsr))
/* Test for hardware support for ARM floating point operations, explicitly
checking for float and double support, see "ARM C Language Extensions", 6.5.1 */
#elif defined(__ARM_FP) && (__ARM_FP & 0x0C) != 0
#define __rfs(__fpsr) __asm __volatile("vmrs %0,fpscr" : "=&r" (*(__fpsr)))
#define __wfs(__fpsr) __asm __volatile("vmsr fpscr,%0" : : "r" (__fpsr))
#else
#define __rfs(__fpsr)
#define __rfs(__fpsr) (*(__fpsr) = 0)
#define __wfs(__fpsr)
#endif