Author: andrew
Date: Sat Mar 22 12:28:21 2014
New Revision: 263631
URL: http://svnweb.freebsd.org/changeset/base/263631
Log:
Implement __flt_rounds for ARMv6 hard-float. The fpscr register stores the
current rounding mode used by the VFP unit.
Modified:
head/lib/libc/arm/gen/flt_rounds.c
Modified: head/lib/libc/arm/gen/flt_rounds.c
==============================================================================
--- head/lib/libc/arm/gen/flt_rounds.c Sat Mar 22 11:49:44 2014
(r263630)
+++ head/lib/libc/arm/gen/flt_rounds.c Sat Mar 22 12:28:21 2014
(r263631)
@@ -30,20 +30,32 @@ __FBSDID("$FreeBSD$");
#include <fenv.h>
#include <float.h>
+#ifndef __ARM_PCS_VFP
#include "softfloat-for-gcc.h"
#include "milieu.h"
#include "softfloat.h"
+#endif
int
__flt_rounds(void)
{
+ int mode;
-#ifndef ARM_HARD_FLOAT
+#ifndef __ARM_PCS_VFP
/*
* Translate our rounding modes to the unnamed
* manifest constants required by C99 et. al.
*/
- switch (__softfloat_float_rounding_mode) {
+ mode = __softfloat_float_rounding_mode;
+#else /* __ARM_PCS_VFP */
+ /*
+ * Read the floating-point status and control register
+ */
+ __asm __volatile("vmrs %0, fpscr" : "=&r"(mode));
+ mode &= _ROUND_MASK;
+#endif /* __ARM_PCS_VFP */
+
+ switch (mode) {
case FE_TOWARDZERO:
return (0);
case FE_TONEAREST:
@@ -54,12 +66,4 @@ __flt_rounds(void)
return (3);
}
return (-1);
-#else /* ARM_HARD_FLOAT */
- /*
- * Apparently, the rounding mode is specified as part of the
- * instruction format on ARM, so the dynamic rounding mode is
- * indeterminate. Some FPUs may differ.
- */
- return (-1);
-#endif /* ARM_HARD_FLOAT */
}
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