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Update FPSCR_FX consistently per the Programming Environment Manual. So 

if any sticky bit is set, FPSCR_FX should be set.  If no sticky bits are
set, then FPSCR_FX should be clear.
This commit is contained in:
matt 2004-04-04 19:54:05 +00:00
parent 6da9a37235
commit 6aeab1d37b
1 changed files with 13 additions and 5 deletions
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18
lib/libc/arch/powerpc/gen/fpsetsticky.c
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@ -1,4 +1,4 @@
/* $NetBSD: fpsetsticky.c,v 1.5 2004/04/04 19:31:19 matt Exp $ */
/* $NetBSD: fpsetsticky.c,v 1.6 2004/04/04 19:54:05 matt Exp $ */
/*
* Copyright (c) 1999 The NetBSD Foundation, Inc.
@ -63,18 +63,26 @@ fpsetsticky(fp_except mask)
__asm__ __volatile("mffs %0" : "=f"(fpscr));
old = ((uint32_t)fpscr & STICKYBITS) >> STICKYSHFT;
/*
* FPSCR_VX (aka FP_X_INV) is not a sticky bit but a summary
* of the all the FPSCR_VX* sticky bits. So FP_X_INV is cleared
* FPSCR_VX (aka FP_X_INV) is not a sticky bit but a summary of the
* all the FPSCR_VX* sticky bits. So when FP_X_INV is cleared then
* clear all of those bits, likewise when it's set, set them all.
*/
if ((mask & FP_X_INV) == 0)
fpscr &= ~INVBITS;
else
fpscr |= INVBITS;
if (mask == 0)
fpscr &= ~FPSCR_FX;
fpscr &= ~STICKYBITS;
fpscr |= ((uint32_t)mask << STICKYSHFT) & STICKYBITS;
/*
* Make FPSCR_FX reflect the presence of a set sticky bit (or not).
*/
if (fpscr & (STICKYBITS|INVBITS))
fpscr |= FPSCR_FX;
else
fpscr &= ~FPSCR_FX;
/*
* Write back the fpscr.
*/
__asm__ __volatile("mtfsf 0xff,%0" :: "f"(fpscr));
return (old);
}