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| author | Elliott Hughes <enh@google.com> | 2014-06-09 14:29:25 -0700 |
|---|---|---|
| committer | Elliott Hughes <enh@google.com> | 2014-06-09 15:20:59 -0700 |
| commit | 43bf81e54427ac7ae55dc79c057cca62f94c5f77 (patch) | |
| tree | 583366efb33b55f0789799be9782177ef692cd30 /libm/amd64 | |
| parent | 8c054c51c3324d36dc9ed1cf50229bae8a3f875c (diff) | |
| download | bionic-43bf81e54427ac7ae55dc79c057cca62f94c5f77.zip bionic-43bf81e54427ac7ae55dc79c057cca62f94c5f77.tar.gz bionic-43bf81e54427ac7ae55dc79c057cca62f94c5f77.tar.bz2 | |
Move x86 fenv implementation details into fenv.c.
Change-Id: I6cb8c730483c325dc3cb75c2b2fbdd2d8455a54c
Diffstat (limited to 'libm/amd64')
| -rwxr-xr-x | libm/amd64/fenv.c | 29 |
1 files changed, 19 insertions, 10 deletions
diff --git a/libm/amd64/fenv.c b/libm/amd64/fenv.c index b058de2..4b24ff9 100755 --- a/libm/amd64/fenv.c +++ b/libm/amd64/fenv.c @@ -30,6 +30,15 @@ #include <fenv.h> #include <machine/fpu.h> +#define SSE_MASK_SHIFT 7 + +/* + * The following symbol is simply the bitwise-inclusive OR of all floating-point + * rounding direction constants defined above. + */ +#define X87_ROUND_MASK (FE_TONEAREST | FE_DOWNWARD | FE_UPWARD | FE_TOWARDZERO) +#define SSE_ROUND_SHIFT 3 + /* * The following constant represents the default floating-point environment * (that is, the one installed at program startup) and has type pointer to @@ -203,7 +212,7 @@ fegetround(void) */ __asm__ __volatile__ ("fnstcw %0" : "=m" (control)); - return (control & _X87_ROUND_MASK); + return (control & X87_ROUND_MASK); } /* @@ -218,14 +227,14 @@ fesetround(int round) unsigned int mxcsr; /* Check whether requested rounding direction is supported */ - if (round & ~_X87_ROUND_MASK) + if (round & ~X87_ROUND_MASK) return (-1); /* Store the current x87 control word register */ __asm__ __volatile__ ("fnstcw %0" : "=m" (control)); /* Set the rounding direction */ - control &= ~_X87_ROUND_MASK; + control &= ~X87_ROUND_MASK; control |= round; /* Load the x87 control word register */ @@ -233,8 +242,8 @@ fesetround(int round) /* Same for the SSE environment */ __asm__ __volatile__ ("stmxcsr %0" : "=m" (mxcsr)); - mxcsr &= ~(_X87_ROUND_MASK << _SSE_ROUND_SHIFT); - mxcsr |= round << _SSE_ROUND_SHIFT; + mxcsr &= ~(X87_ROUND_MASK << SSE_ROUND_SHIFT); + mxcsr |= round << SSE_ROUND_SHIFT; __asm__ __volatile__ ("ldmxcsr %0" : : "m" (mxcsr)); return (0); @@ -291,7 +300,7 @@ feholdexcept(fenv_t *envp) mxcsr &= ~FE_ALL_EXCEPT; /* Mask all exceptions */ - mxcsr |= FE_ALL_EXCEPT << _SSE_MASK_SHIFT; + mxcsr |= FE_ALL_EXCEPT << SSE_MASK_SHIFT; /* Store the MXCSR register */ __asm__ __volatile__ ("ldmxcsr %0" : : "m" (mxcsr)); @@ -362,11 +371,11 @@ feenableexcept(int mask) __asm__ __volatile__ ("fnstcw %0" : "=m" (control)); __asm__ __volatile__ ("stmxcsr %0" : "=m" (mxcsr)); - omask = ~(control | (mxcsr >> _SSE_MASK_SHIFT)) & FE_ALL_EXCEPT; + omask = ~(control | (mxcsr >> SSE_MASK_SHIFT)) & FE_ALL_EXCEPT; control &= ~mask; __asm__ __volatile__ ("fldcw %0" : : "m" (control)); - mxcsr &= ~(mask << _SSE_MASK_SHIFT); + mxcsr &= ~(mask << SSE_MASK_SHIFT); __asm__ __volatile__ ("ldmxcsr %0" : : "m" (mxcsr)); return (omask); @@ -383,11 +392,11 @@ fedisableexcept(int mask) __asm__ __volatile__ ("fnstcw %0" : "=m" (control)); __asm__ __volatile__ ("stmxcsr %0" : "=m" (mxcsr)); - omask = ~(control | (mxcsr >> _SSE_MASK_SHIFT)) & FE_ALL_EXCEPT; + omask = ~(control | (mxcsr >> SSE_MASK_SHIFT)) & FE_ALL_EXCEPT; control |= mask; __asm__ __volatile__ ("fldcw %0" : : "m" (control)); - mxcsr |= mask << _SSE_MASK_SHIFT; + mxcsr |= mask << SSE_MASK_SHIFT; __asm__ __volatile__ ("ldmxcsr %0" : : "m" (mxcsr)); return (omask); |