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M68K pull request 20230116 

fix FPSR quotient byte
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Merge tag 'm68k-next-pull-request' of https://github.com/vivier/qemu-m68k into staging

M68K pull request 20230116

fix FPSR quotient byte

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# gpg: Signature made Mon 16 Jan 2023 09:18:35 GMT
# gpg:                using RSA key CD2F75DDC8E3A4DC2E4F5173F30C38BD3F2FBE3C
# gpg:                issuer "laurent@vivier.eu"
# gpg: Good signature from "Laurent Vivier <lvivier@redhat.com>" [full]
# gpg:                 aka "Laurent Vivier <laurent@vivier.eu>" [full]
# gpg:                 aka "Laurent Vivier (Red Hat) <lvivier@redhat.com>" [full]
# Primary key fingerprint: CD2F 75DD C8E3 A4DC 2E4F  5173 F30C 38BD 3F2F BE3C

* tag 'm68k-next-pull-request' of https://github.com/vivier/qemu-m68k:
  target/m68k: fix FPSR quotient byte for frem instruction
  target/m68k: fix FPSR quotient byte for fmod instruction
  target/m68k: pass sign directly into make_quotient()
  target/m68k: pass quotient directly into make_quotient()

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2023-01-16 16:55:30 +00:00
parent fb7e799034 1a282f60a9
commit 2f8d6a88e4
1 changed files with 31 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

49
target/m68k/fpu_helper.c
View File

@ -515,37 +515,50 @@ uint32_t HELPER(fmovemd_ld_postinc)(CPUM68KState *env, uint32_t addr,
return fmovem_postinc(env, addr, mask, cpu_ld_float64_ra);
}
static void make_quotient(CPUM68KState *env, floatx80 val)
static void make_quotient(CPUM68KState *env, int sign, uint32_t quotient)
{
int32_t quotient;
int sign;
if (floatx80_is_any_nan(val)) {
return;
}
quotient = floatx80_to_int32(val, &env->fp_status);
sign = quotient < 0;
if (sign) {
quotient = -quotient;
}
quotient = (sign << 7) | (quotient & 0x7f);
env->fpsr = (env->fpsr & ~FPSR_QT_MASK) | (quotient << FPSR_QT_SHIFT);
}
void HELPER(fmod)(CPUM68KState *env, FPReg *res, FPReg *val0, FPReg *val1)
{
res->d = floatx80_mod(val1->d, val0->d, &env->fp_status);
uint64_t quotient;
int sign = extractFloatx80Sign(val1->d) ^ extractFloatx80Sign(val0->d);
make_quotient(env, res->d);
res->d = floatx80_modrem(val1->d, val0->d, true, &quotient,
&env->fp_status);
if (floatx80_is_any_nan(res->d)) {
return;
}
make_quotient(env, sign, quotient);
}
void HELPER(frem)(CPUM68KState *env, FPReg *res, FPReg *val0, FPReg *val1)
{
res->d = floatx80_rem(val1->d, val0->d, &env->fp_status);
FPReg fp_quot;
floatx80 fp_rem;
make_quotient(env, res->d);
fp_rem = floatx80_rem(val1->d, val0->d, &env->fp_status);
if (!floatx80_is_any_nan(fp_rem)) {
float_status fp_status = { };
uint32_t quotient;
int sign;
/* Calculate quotient directly using round to nearest mode */
set_float_rounding_mode(float_round_nearest_even, &fp_status);
set_floatx80_rounding_precision(
get_floatx80_rounding_precision(&env->fp_status), &fp_status);
fp_quot.d = floatx80_div(val1->d, val0->d, &fp_status);
sign = extractFloatx80Sign(fp_quot.d);
quotient = floatx80_to_int32(floatx80_abs(fp_quot.d), &env->fp_status);
make_quotient(env, sign, quotient);
}
res->d = fp_rem;
}
void HELPER(fgetexp)(CPUM68KState *env, FPReg *res, FPReg *val)