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i386: do not 'lexpand' into registers necessarily

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Previously, long longs were 'lexpand'ed into two registers
always.

Now, it expands
- constants into two constants (lo-part, hi-part)
- variables into two lvalues with offset+4 for the hi-part.

This makes long long operations look a bit nicer.

Also: don't apply i386 'inc/dec' optimization if carry
generation is wanted.
This commit is contained in:
grischka
2016-10-16 19:04:40 +02:00
parent 6245db9fca
commit d9b7f018ce
2 changed files with 18 additions and 12 deletions
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26
tccgen.c
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@ -1209,19 +1209,25 @@ static int reg_fret(int t)
return REG_FRET;
}
/* expand long long on stack in two int registers */
/* expand long long on stack in two ints */
static void lexpand(void)
{
int u;
int u, v;
u = vtop->type.t & (VT_DEFSIGN | VT_UNSIGNED);
gv(RC_INT);
vdup();
vtop[0].r = vtop[-1].r2;
vtop[0].r2 = VT_CONST;
vtop[-1].r2 = VT_CONST;
vtop[0].type.t = VT_INT | u;
vtop[-1].type.t = VT_INT | u;
v = vtop->r & (VT_VALMASK | VT_LVAL);
if (v == VT_CONST) {
vdup();
vtop[0].c.i >>= 32;
} else if (v == (VT_LVAL|VT_CONST) || v == (VT_LVAL|VT_LOCAL)) {
vdup();
vtop[0].c.i += 4;
} else {
gv(RC_INT);
vdup();
vtop[0].r = vtop[-1].r2;
vtop[0].r2 = vtop[-1].r2 = VT_CONST;
}
vtop[0].type.t = vtop[-1].type.t = VT_INT | u;
}
#ifdef TCC_TARGET_ARM