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Enhance chibicc

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This commit is contained in:
Justine Tunney 2020-12-09 04:00:48 -08:00
parent 8da931a7f6
commit 9df2cef4c4
52 changed files with 2606 additions and 2004 deletions
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14
tool/build/lib/divmul.c
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@ -164,8 +164,8 @@ void OpMulAxAlEbSigned(struct Machine *m, uint32_t rde) {
int16_t ax;
uint8_t *p;
p = GetModrmRegisterBytePointerRead(m, rde);
__builtin_mul_overflow((int8_t)Read8(m->ax), (int8_t)Read8(p), &ax);
of = (int)ax != (int8_t)ax;
ax = (int8_t)Read8(m->ax) * (int8_t)Read8(p);
of = ax != (int8_t)ax;
m->flags = SetFlag(m->flags, FLAGS_CF, of);
m->flags = SetFlag(m->flags, FLAGS_OF, of);
Write16(m->ax, ax);
@ -176,8 +176,8 @@ void OpMulAxAlEbUnsigned(struct Machine *m, uint32_t rde) {
bool of;
uint8_t *p;
p = GetModrmRegisterBytePointerRead(m, rde);
__builtin_mul_overflow(Read8(m->ax), Read8(p), &ax);
of = (uint8_t)ax != ax;
ax = Read8(m->ax) * Read8(p);
of = ax != (uint8_t)ax;
m->flags = SetFlag(m->flags, FLAGS_CF, of);
m->flags = SetFlag(m->flags, FLAGS_OF, of);
Write16(m->ax, ax);
@ -256,10 +256,12 @@ static void AluImul(struct Machine *m, uint32_t rde, uint8_t *a, uint8_t *b) {
of = __builtin_mul_overflow(x, y, &z);
Write64(RegRexrReg(m, rde), z & 0xffffffff);
} else {
int16_t x, y, z;
int z;
int16_t x, y;
x = Read16(a);
y = Read16(b);
of = __builtin_mul_overflow(x, y, &z);
z = x * y;
of = z != (int16_t)z;
Write16(RegRexrReg(m, rde), z);
}
m->flags = SetFlag(m->flags, FLAGS_CF, of);