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x86-64: Allow loads from some structs/unions

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GCC allows register loads for asms based on type mode,
and correctly sized structs/union have an allowed mode
(basically 1,2,4,8 sized aggregates).
This commit is contained in:
Michael Matz
2016-08-08 20:18:11 +02:00
parent 9ae10cad1f
commit ca8c1cd643
2 changed files with 22 additions and 0 deletions
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16
x86_64-gen.c
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@ -382,6 +382,22 @@ void load(int r, SValue *sv)
load(fr, &v1);
}
ll = 0;
/* Like GCC we can load from small enough properly sized
structs and unions as well.
XXX maybe move to generic operand handling, but should
occur only with asm, so tccasm.c might also be a better place */
if ((ft & VT_BTYPE) == VT_STRUCT) {
int align;
switch (type_size(&sv->type, &align)) {
case 1: ft = VT_BYTE; break;
case 2: ft = VT_SHORT; break;
case 4: ft = VT_INT; break;
case 8: ft = VT_LLONG; break;
default:
tcc_error("invalid aggregate type for register load");
break;
}
}
if ((ft & VT_BTYPE) == VT_FLOAT) {
b = 0x6e0f66;
r = REG_VALUE(r); /* movd */