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[AArch64] Use builtins for fpcr/fpsr

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Since GCC has support for accessing FPSR/FPCR, use them when possible
so that the asm instructions can be removed eventually.  Although GCC 5
supports the builtins, it has an optimization bug, so use them from GCC 6
onwards.

	* sysdeps/aarch64/fpu/fpu_control.h: Use builtins for accessing
	FPCR/FPSR.
This commit is contained in:
Wilco Dijkstra 2018-02-09 16:59:23 +00:00
parent 1f6676d7da
commit 3f8d9d58c5
2 changed files with 16 additions and 4 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2018-02-09 Wilco Dijkstra <wdijkstr@arm.com>
* sysdeps/aarch64/fpu/fpu_control.h: Use builtins for accessing
FPCR/FPSR.
2018-02-09 Rical Jasan <ricaljasan@pacific.net>
* manual/creature.texi: Convert references to gcc.info to gcc.

15
sysdeps/aarch64/fpu/fpu_control.h
View File

@ -21,17 +21,24 @@
/* Macros for accessing the FPCR and FPSR. */
#define _FPU_GETCW(fpcr) \
#if __GNUC_PREREQ (6,0)
# define _FPU_GETCW(fpcr) (fpcr = __builtin_aarch64_get_fpcr ())
# define _FPU_SETCW(fpcr) __builtin_aarch64_set_fpcr (fpcr)
# define _FPU_GETFPSR(fpsr) (fpsr = __builtin_aarch64_get_fpsr ())
# define _FPU_SETFPSR(fpsr) __builtin_aarch64_set_fpsr (fpsr)
#else
# define _FPU_GETCW(fpcr) \
__asm__ __volatile__ ("mrs %0, fpcr" : "=r" (fpcr))
#define _FPU_SETCW(fpcr) \
# define _FPU_SETCW(fpcr) \
__asm__ __volatile__ ("msr fpcr, %0" : : "r" (fpcr))
#define _FPU_GETFPSR(fpsr) \
# define _FPU_GETFPSR(fpsr) \
__asm__ __volatile__ ("mrs %0, fpsr" : "=r" (fpsr))
#define _FPU_SETFPSR(fpsr) \
# define _FPU_SETFPSR(fpsr) \
__asm__ __volatile__ ("msr fpsr, %0" : : "r" (fpsr))
#endif
/* Reserved bits should be preserved when modifying register
contents. These two masks indicate which bits in each of FPCR and