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ARM: 8026/1: Fix emulation of multiply accumulate instructions

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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>
This commit is contained in:
Jay Foad 2014-04-14 16:23:15 +01:00 committed by Russell King
parent c39e1ef77c
commit 244b478386
2 changed files with 4 additions and 0 deletions
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2
arch/arm/vfp/vfpdouble.c
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@ -866,6 +866,8 @@ vfp_double_multiply_accumulate(int dd, int dn, int dm, u32 fpscr, u32 negate, ch
vdp.sign = vfp_sign_negate(vdp.sign);
vfp_double_unpack(&vdn, vfp_get_double(dd));
if (vdn.exponent == 0 && vdn.significand)
vfp_double_normalise_denormal(&vdn);
if (negate & NEG_SUBTRACT)
vdn.sign = vfp_sign_negate(vdn.sign);

2
arch/arm/vfp/vfpsingle.c
View File

@ -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);