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Fix guest x86/amd64 helper_fprem/helper_fprem1, by Julian Seward.

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git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2588 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
ths 2007-04-02 16:33:41 +00:00
parent 2d0e944d1c
commit 7524c84d82
1 changed files with 71 additions and 28 deletions
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99
target-i386/helper.c
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@ -3139,30 +3139,51 @@ void helper_fprem1(void)
CPU86_LDouble dblq, fpsrcop, fptemp;
CPU86_LDoubleU fpsrcop1, fptemp1;
int expdif;
int q;
signed long long int q;
if (isinf(ST0) || isnan(ST0) || isnan(ST1) || (ST1 == 0.0)) {
ST0 = 0.0 / 0.0; /* NaN */
env->fpus &= (~0x4700); /* (C3,C2,C1,C0) <-- 0000 */
return;
}
fpsrcop = ST0;
fptemp = ST1;
fpsrcop1.d = fpsrcop;
fptemp1.d = fptemp;
expdif = EXPD(fpsrcop1) - EXPD(fptemp1);
if (expdif < 0) {
/* optimisation? taken from the AMD docs */
env->fpus &= (~0x4700); /* (C3,C2,C1,C0) <-- 0000 */
/* ST0 is unchanged */
return;
}
if (expdif < 53) {
dblq = fpsrcop / fptemp;
dblq = (dblq < 0.0)? ceil(dblq): floor(dblq);
ST0 = fpsrcop - fptemp*dblq;
q = (int)dblq; /* cutting off top bits is assumed here */
/* round dblq towards nearest integer */
dblq = rint(dblq);
ST0 = fpsrcop - fptemp * dblq;
/* convert dblq to q by truncating towards zero */
if (dblq < 0.0)
q = (signed long long int)(-dblq);
else
q = (signed long long int)dblq;
env->fpus &= (~0x4700); /* (C3,C2,C1,C0) <-- 0000 */
/* (C0,C1,C3) <-- (q2,q1,q0) */
env->fpus |= (q&0x4) << 6; /* (C0) <-- q2 */
env->fpus |= (q&0x2) << 8; /* (C1) <-- q1 */
env->fpus |= (q&0x1) << 14; /* (C3) <-- q0 */
/* (C0,C3,C1) <-- (q2,q1,q0) */
env->fpus |= (q & 0x4) << (8 - 2); /* (C0) <-- q2 */
env->fpus |= (q & 0x2) << (14 - 1); /* (C3) <-- q1 */
env->fpus |= (q & 0x1) << (9 - 0); /* (C1) <-- q0 */
} else {
env->fpus |= 0x400; /* C2 <-- 1 */
fptemp = pow(2.0, expdif-50);
fptemp = pow(2.0, expdif - 50);
fpsrcop = (ST0 / ST1) / fptemp;
/* fpsrcop = integer obtained by rounding to the nearest */
fpsrcop = (fpsrcop-floor(fpsrcop) < ceil(fpsrcop)-fpsrcop)?
floor(fpsrcop): ceil(fpsrcop);
/* fpsrcop = integer obtained by chopping */
fpsrcop = (fpsrcop < 0.0) ?
-(floor(fabs(fpsrcop))) : floor(fpsrcop);
ST0 -= (ST1 * fpsrcop * fptemp);
}
}
@ -3172,30 +3193,52 @@ void helper_fprem(void)
CPU86_LDouble dblq, fpsrcop, fptemp;
CPU86_LDoubleU fpsrcop1, fptemp1;
int expdif;
int q;
fpsrcop = ST0;
fptemp = ST1;
signed long long int q;
if (isinf(ST0) || isnan(ST0) || isnan(ST1) || (ST1 == 0.0)) {
ST0 = 0.0 / 0.0; /* NaN */
env->fpus &= (~0x4700); /* (C3,C2,C1,C0) <-- 0000 */
return;
}
fpsrcop = (CPU86_LDouble)ST0;
fptemp = (CPU86_LDouble)ST1;
fpsrcop1.d = fpsrcop;
fptemp1.d = fptemp;
expdif = EXPD(fpsrcop1) - EXPD(fptemp1);
if ( expdif < 53 ) {
dblq = fpsrcop / fptemp;
dblq = (dblq < 0.0)? ceil(dblq): floor(dblq);
ST0 = fpsrcop - fptemp*dblq;
q = (int)dblq; /* cutting off top bits is assumed here */
if (expdif < 0) {
/* optimisation? taken from the AMD docs */
env->fpus &= (~0x4700); /* (C3,C2,C1,C0) <-- 0000 */
/* (C0,C1,C3) <-- (q2,q1,q0) */
env->fpus |= (q&0x4) << 6; /* (C0) <-- q2 */
env->fpus |= (q&0x2) << 8; /* (C1) <-- q1 */
env->fpus |= (q&0x1) << 14; /* (C3) <-- q0 */
/* ST0 is unchanged */
return;
}
if ( expdif < 53 ) {
dblq = fpsrcop/*ST0*/ / fptemp/*ST1*/;
/* round dblq towards zero */
dblq = (dblq < 0.0) ? ceil(dblq) : floor(dblq);
ST0 = fpsrcop/*ST0*/ - fptemp * dblq;
/* convert dblq to q by truncating towards zero */
if (dblq < 0.0)
q = (signed long long int)(-dblq);
else
q = (signed long long int)dblq;
env->fpus &= (~0x4700); /* (C3,C2,C1,C0) <-- 0000 */
/* (C0,C3,C1) <-- (q2,q1,q0) */
env->fpus |= (q & 0x4) << (8 - 2); /* (C0) <-- q2 */
env->fpus |= (q & 0x2) << (14 - 1); /* (C3) <-- q1 */
env->fpus |= (q & 0x1) << (9 - 0); /* (C1) <-- q0 */
} else {
int N = 32 + (expdif % 32); /* as per AMD docs */
env->fpus |= 0x400; /* C2 <-- 1 */
fptemp = pow(2.0, expdif-50);
fptemp = pow(2.0, (double)(expdif - N));
fpsrcop = (ST0 / ST1) / fptemp;
/* fpsrcop = integer obtained by chopping */
fpsrcop = (fpsrcop < 0.0)?
-(floor(fabs(fpsrcop))): floor(fpsrcop);
fpsrcop = (fpsrcop < 0.0) ?
-(floor(fabs(fpsrcop))) : floor(fpsrcop);
ST0 -= (ST1 * fpsrcop * fptemp);
}
}