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target-mips: Fix for helpers for EXTR_* instructions

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The change removes some unnecessary and incorrect code for EXTR_S.H.
Further, it corrects the mask for shift value in the EXTR_ instructions. It also
extends the existing tests so they trigger the issues corrected with the change.

Signed-off-by: Petar Jovanovic <petarj@mips.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Petar Jovanovic 2012-12-10 16:28:17 +01:00 • committed by Aurelien Jarno
parent eec8972a5b
commit b8abbbe8df
9 changed files with 195 additions and 35 deletions
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45
target-mips/dsp_helper.c
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@ -484,35 +484,6 @@ static inline uint8_t mipsdsp_rrshift1_sub_u8(uint8_t a, uint8_t b)
return (temp >> 1) & 0x00FF;
}
static inline int64_t mipsdsp_rashift_short_acc(int32_t ac,
int32_t shift,
CPUMIPSState *env)
{
int32_t sign, temp31;
int64_t temp, acc;
sign = (env->active_tc.HI[ac] >> 31) & 0x01;
acc = ((int64_t)env->active_tc.HI[ac] << 32) |
((int64_t)env->active_tc.LO[ac] & 0xFFFFFFFF);
if (shift == 0) {
temp = acc;
} else {
if (sign == 0) {
temp = (((int64_t)0x01 << (32 - shift + 1)) - 1) & (acc >> shift);
} else {
temp = ((((int64_t)0x01 << (shift + 1)) - 1) << (32 - shift)) |
(acc >> shift);
}
}
temp31 = (temp >> 31) & 0x01;
if (sign != temp31) {
set_DSPControl_overflow_flag(1, 23, env);
}
return temp;
}
/* 128 bits long. p[0] is LO, p[1] is HI. */
static inline void mipsdsp_rndrashift_short_acc(int64_t *p,
int32_t ac,
@ -3407,7 +3378,7 @@ target_ulong helper_extr_w(target_ulong ac, target_ulong shift,
int32_t tempI;
int64_t tempDL[2];
shift = shift & 0x0F;
shift = shift & 0x1F;
mipsdsp_rndrashift_short_acc(tempDL, ac, shift, env);
if ((tempDL[1] != 0 || (tempDL[0] & MIPSDSP_LHI) != 0) &&
@ -3435,7 +3406,7 @@ target_ulong helper_extr_r_w(target_ulong ac, target_ulong shift,
{
int64_t tempDL[2];
shift = shift & 0x0F;
shift = shift & 0x1F;
mipsdsp_rndrashift_short_acc(tempDL, ac, shift, env);
if ((tempDL[1] != 0 || (tempDL[0] & MIPSDSP_LHI) != 0) &&
@ -3462,7 +3433,7 @@ target_ulong helper_extr_rs_w(target_ulong ac, target_ulong shift,
int32_t tempI, temp64;
int64_t tempDL[2];
shift = shift & 0x0F;
shift = shift & 0x1F;
mipsdsp_rndrashift_short_acc(tempDL, ac, shift, env);
if ((tempDL[1] != 0 || (tempDL[0] & MIPSDSP_LHI) != 0) &&
@ -3645,11 +3616,15 @@ target_ulong helper_dextr_rs_l(target_ulong ac, target_ulong shift,
target_ulong helper_extr_s_h(target_ulong ac, target_ulong shift,
CPUMIPSState *env)
{
int64_t temp;
int64_t temp, acc;
shift = shift & 0x0F;
shift = shift & 0x1F;
acc = ((int64_t)env->active_tc.HI[ac] << 32) |
((int64_t)env->active_tc.LO[ac] & 0xFFFFFFFF);
temp = acc >> shift;
temp = mipsdsp_rashift_short_acc(ac, shift, env);
if (temp > (int64_t)0x7FFF) {
temp = 0x00007FFF;
set_DSPControl_overflow_flag(1, 23, env);