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Add support for multiplication.

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Multiplication instructions don't set the overflow flag so we need
to manually check, which is why this is more complicated than
addition.
This commit is contained in:
Michael Munday 2016-12-20 13:14:53 -05:00
parent d256d99659
commit d94f4ac079
1 changed files with 39 additions and 2 deletions
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41
src/vm_s390x.dasc
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@ -1256,8 +1256,45 @@ static void build_ins(BuildCtx *ctx, BCOp op, int defop)
| ins_arithdn sr
break;
case BC_MULVN: case BC_MULNV: case BC_MULVV:
| stg r0, 0(r0)
| stg r0, 0(r0)
| ins_arithpre
| // For multiplication we use msgfr and check if the result
| // fits in an int32_t.
switch(op) {
case BC_MULVN:
| lg RB, 0(RB, BASE)
| lg RC, 0(RC, KBASE)
| checkint RB, ->vmeta_arith_vno
| checkint RC, ->vmeta_arith_vno
| lgfr RB, RB
| msgfr RB, RC
| lgfr RC, RB
| cgr RB, RC; jne ->vmeta_arith_vno
break;
case BC_MULNV:
| lg RB, 0(RB, BASE)
| lg RC, 0(RC, KBASE)
| checkint RB, ->vmeta_arith_nvo
| checkint RC, ->vmeta_arith_nvo
| lgfr RB, RB
| msgfr RB, RC
| lgfr RC, RB
| cgr RB, RC; jne ->vmeta_arith_nvo
break;
default:
| lg RB, 0(RB, BASE)
| lg RC, 0(RC, BASE)
| checkint RB, ->vmeta_arith_vvo
| checkint RC, ->vmeta_arith_vvo
| lgfr RB, RB
| msgfr RB, RC
| lgfr RC, RB
| cgr RB, RC; jne ->vmeta_arith_vvo
break;
}
| llgfr RB, RB
| setint RB
| stg RB, 0(RA, BASE)
| ins_next
break;
case BC_DIVVN: case BC_DIVNV: case BC_DIVVV:
| stg r0, 0(r0)