SYS-OSS/FRET-qemu
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target/hexagon: Remove Double

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This structure, with bitfields, is incorrect for big-endian.
Use extract64 and deposit64 instead.

Reviewed-by: Brian Cain <brian.cain@oss.qualcomm.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2024-12-08 15:34:33 -06:00
parent fefc9702e6
commit 8429306c32
1 changed files with 16 additions and 30 deletions
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46
target/hexagon/fma_emu.c
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@ -43,39 +43,29 @@
#define WAY_BIG_EXP 4096
typedef union {
double f;
uint64_t i;
struct {
uint64_t mant:52;
uint64_t exp:11;
uint64_t sign:1;
};
} Double;
static uint64_t float64_getmant(float64 f64)
{
Double a = { .i = f64 };
uint64_t mant = extract64(f64, 0, 52);
if (float64_is_normal(f64)) {
return a.mant | 1ULL << 52;
return mant | 1ULL << 52;
}
if (float64_is_zero(f64)) {
return 0;
}
if (float64_is_denormal(f64)) {
return a.mant;
return mant;
}
return ~0ULL;
}
int32_t float64_getexp(float64 f64)
{
Double a = { .i = f64 };
int exp = extract64(f64, 52, 11);
if (float64_is_normal(f64)) {
return a.exp;
return exp;
}
if (float64_is_denormal(f64)) {
return a.exp + 1;
return exp + 1;
}
return -1;
}
@ -346,6 +336,8 @@ float32 infinite_float32(uint8_t sign)
/* Return a maximum finite value with the requested sign */
static float64 accum_round_float64(Accum a, float_status *fp_status)
{
uint64_t ret;
if ((int128_gethi(a.mant) == 0) && (int128_getlo(a.mant) == 0)
&& ((a.guard | a.round | a.sticky) == 0)) {
/* result zero */
@ -455,22 +447,16 @@ static float64 accum_round_float64(Accum a, float_status *fp_status)
}
}
/* Underflow? */
if (int128_getlo(a.mant) & (1ULL << DF_MANTBITS)) {
ret = int128_getlo(a.mant);
if (ret & (1ULL << DF_MANTBITS)) {
/* Leading one means: No, we're normal. So, we should be done... */
Double ret;
ret.i = 0;
ret.sign = a.sign;
ret.exp = a.exp;
ret.mant = int128_getlo(a.mant);
return ret.i;
ret = deposit64(ret, 52, 11, a.exp);
} else {
assert(a.exp == 1);
ret = deposit64(ret, 52, 11, 0);
}
assert(a.exp == 1);
Double ret;
ret.i = 0;
ret.sign = a.sign;
ret.exp = 0;
ret.mant = int128_getlo(a.mant);
return ret.i;
ret = deposit64(ret, 63, 1, a.sign);
return ret;
}
float64 internal_mpyhh(float64 a, float64 b,