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target/m68k: define floatx80_move()

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This functions is needed by upcoming m68k softfloat functions.

Source code copied for WinUAE (tag 3500)
(The WinUAE file has been copied from QEMU and has
the QEMU licensing notice)

Backports commit 9a069775a8087cbd6fa8c479b69be8d37bd90351 from qemu
This commit is contained in:
Laurent Vivier 2018-03-12 09:20:42 -04:00 committed by Lioncash
parent a81439c7ca
commit 5bc9cdb681
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GPG Key ID: 4E3C3CC1031BA9C7
2 changed files with 28 additions and 0 deletions
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27
qemu/target/m68k/softfloat.c
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@ -247,3 +247,30 @@ floatx80 floatx80_scale(floatx80 a, floatx80 b, float_status *status)
return roundAndPackFloatx80(status->floatx80_rounding_precision, return roundAndPackFloatx80(status->floatx80_rounding_precision,
aSign, aExp, aSig, 0, status); aSign, aExp, aSig, 0, status);
} }
floatx80 floatx80_move(floatx80 a, float_status *status)
{
flag aSign;
int32_t aExp;
uint64_t aSig;
aSig = extractFloatx80Frac(a);
aExp = extractFloatx80Exp(a);
aSign = extractFloatx80Sign(a);
if (aExp == 0x7FFF) {
if ((uint64_t)(aSig << 1)) {
return propagateFloatx80NaNOneArg(a, status);
}
return a;
}
if (aExp == 0) {
if (aSig == 0) {
return a;
}
normalizeRoundAndPackFloatx80(status->floatx80_rounding_precision,
aSign, aExp, aSig, 0, status);
}
return roundAndPackFloatx80(status->floatx80_rounding_precision, aSign,
aExp, aSig, 0, status);
}

1
qemu/target/m68k/softfloat.h
View File

@ -26,4 +26,5 @@ floatx80 floatx80_mod(floatx80 a, floatx80 b, float_status *status);
floatx80 floatx80_getman(floatx80 a, float_status *status); floatx80 floatx80_getman(floatx80 a, float_status *status);
floatx80 floatx80_getexp(floatx80 a, float_status *status); floatx80 floatx80_getexp(floatx80 a, float_status *status);
floatx80 floatx80_scale(floatx80 a, floatx80 b, float_status *status); floatx80 floatx80_scale(floatx80 a, floatx80 b, float_status *status);
floatx80 floatx80_move(floatx80 a, float_status *status);
#endif #endif