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authorCatalin Marinas <catalin.marinas@arm.com>2005-08-03 19:53:25 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2005-08-03 19:53:25 +0100
commit7b1fbf292bb4c855ddae8add8c459e94684f7543 (patch)
tree8269bb5c858aaa0a0483cb81759ca947e0b396c1 /arch/arm/vfp
parent858297509590ef4aa5690e30c2f5505077b4f369 (diff)
[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.c3
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;