OpenE2K/qemu-e2k
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e2k: Impl neg src2 in fscale{s,d} and fxscalesx.

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Denis Drakhnia 2021-02-02 17:07:18 +02:00 committed by Denis Drakhnia
parent 399416a0d7
commit b166b260da
1 changed files with 35 additions and 6 deletions
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41
target/e2k/helper_fpu.c
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@ -338,10 +338,25 @@ uint32_t HELPER(frsqrts)(CPUE2KState *env, uint32_t x)
#define IMPL_FSCALE(name, ty, exp_len, exp_off, mul, cvt) \
ty HELPER(name)(CPUE2KState *env, ty src1, uint32_t src2) \
{ \
int32_t p = (int32_t) src2; \
ty max = (1 << exp_len) - 1; \
ty bias = max >> 1; \
ty exp = src2 <= bias ? bias + src2 : max; \
ty s2 = exp << exp_off; \
int32_t bias = max >> 1; \
ty exp; \
ty m = 0; \
if (p <= -bias) { \
exp = 0; \
p += bias + exp_off - 1; \
if (p >= 0 && p < exp_off) { \
m = 1ULL << p; \
} else { \
m = p == -1; \
} \
} else if (p > bias) { \
exp = max; \
} else { \
exp = bias + p; \
} \
ty s2 = (exp << exp_off) | m; \
return mul(env, src1, s2); \
}
@ -351,9 +366,23 @@ IMPL_FSCALE(fscales, uint32_t, 8, 23, helper_fmuls, uint32_to_float32)
void HELPER(fxscalesx)(CPUE2KState *env, floatx80 *src1, uint32_t src2)
{
floatx80 s2;
int32_t p = (int32_t) src2;
uint16_t max = (1 << 15) - 1;
uint16_t bias = max >> 1;
s2.low = 1UL << 63;
s2.high = src2 <= bias ? bias + src2 : max;
int16_t bias = max >> 1;
if (p <= -bias) {
s2.high = 0;
p += bias + 62;
if (p >= 0 && p < 63) {
s2.low = 1ULL << p;
} else {
s2.low = p == -1;
}
} else if (p > bias) {
s2.low = 1UL << 63;
s2.high = max;
} else {
s2.low = 1UL << 63;
s2.high = bias + p;
}
helper_fxmulxx(env, src1, &s2);
}