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authorJay Foad <jay.foad@gmail.com>2014-04-14 16:23:15 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2014-04-14 23:28:24 +0100
commit244b478386260a8a9150b501bc97644e2e07f8d3 (patch)
treef7127bc02f4722ab1b47b16920ee402bae68b965 /arch/arm/vfp/vfpsingle.c
parentc39e1ef77c76729f34cdcb09bbb3a5096d91a740 (diff)
downloadlinux-244b478386260a8a9150b501bc97644e2e07f8d3.tar.bz2
ARM: 8026/1: Fix emulation of multiply accumulate instructions
The emulation for single and double precision multiply accumulate instructions correctly normalised any denormal values in the operand registers, but failed to normalise the destination (accumulator) register. This fixes https://bugzilla.kernel.org/show_bug.cgi?id=70501 Signed-off-by: Jay Foad <jay.foad@gmail.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/vfp/vfpsingle.c')
-rw-r--r--arch/arm/vfp/vfpsingle.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/arm/vfp/vfpsingle.c b/arch/arm/vfp/vfpsingle.c
index b252631b406b..4f96c1617aae 100644
--- a/arch/arm/vfp/vfpsingle.c
+++ b/arch/arm/vfp/vfpsingle.c
@@ -915,6 +915,8 @@ vfp_single_multiply_accumulate(int sd, int sn, s32 m, u32 fpscr, u32 negate, cha
v = vfp_get_float(sd);
pr_debug("VFP: s%u = %08x\n", sd, v);
vfp_single_unpack(&vsn, v);
+ if (vsn.exponent == 0 && vsn.significand)
+ vfp_single_normalise_denormal(&vsn);
if (negate & NEG_SUBTRACT)
vsn.sign = vfp_sign_negate(vsn.sign);