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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>
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
View File

@ -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); vdp.sign = vfp_sign_negate(vdp.sign);
vfp_double_unpack(&vdn, vfp_get_double(dd)); vfp_double_unpack(&vdn, vfp_get_double(dd));
if (vdn.exponent == 0 && vdn.significand)
vfp_double_normalise_denormal(&vdn);
if (negate & NEG_SUBTRACT) if (negate & NEG_SUBTRACT)
vdn.sign = vfp_sign_negate(vdn.sign); 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); v = vfp_get_float(sd);
pr_debug("VFP: s%u = %08x\n", sd, v); pr_debug("VFP: s%u = %08x\n", sd, v);
vfp_single_unpack(&vsn, v); vfp_single_unpack(&vsn, v);
if (vsn.exponent == 0 && vsn.significand)
vfp_single_normalise_denormal(&vsn);
if (negate & NEG_SUBTRACT) if (negate & NEG_SUBTRACT)
vsn.sign = vfp_sign_negate(vsn.sign); vsn.sign = vfp_sign_negate(vsn.sign);