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| author | Catalin Marinas <catalin.marinas@arm.com> | 2005-08-03 19:53:25 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2005-08-03 19:53:25 +0100 |
| commit | 7b1fbf292bb4c855ddae8add8c459e94684f7543 (patch) | |
| tree | 8269bb5c858aaa0a0483cb81759ca947e0b396c1 /arch/arm/vfp | |
| parent | 858297509590ef4aa5690e30c2f5505077b4f369 (diff) | |
| download | lwn-7b1fbf292bb4c855ddae8add8c459e94684f7543.tar.gz lwn-7b1fbf292bb4c855ddae8add8c459e94684f7543.zip | |
[PATCH] ARM: 2841/1: Fix VFP +/-0 case for doubles addition
Patch from Catalin Marinas
The IEEE 754 standard specifies that the result of (x - x), where x is
a valid number, should be -0 if the rounding mode is towards minus
infinity or +0 otherwise.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/vfp')
| -rw-r--r-- | arch/arm/vfp/vfpdouble.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/arm/vfp/vfpdouble.c b/arch/arm/vfp/vfpdouble.c index b801cd66b6ea..9b367a65cb4d 100644 --- a/arch/arm/vfp/vfpdouble.c +++ b/arch/arm/vfp/vfpdouble.c @@ -770,6 +770,9 @@ vfp_double_add(struct vfp_double *vdd, struct vfp_double *vdn, if ((s64)m_sig < 0) { vdd->sign = vfp_sign_negate(vdd->sign); m_sig = -m_sig; + } else if (m_sig == 0) { + vdd->sign = (fpscr & FPSCR_RMODE_MASK) == + FPSCR_ROUND_MINUSINF ? 0x8000 : 0; } } else { m_sig += vdn->significand; |