gh-mirror/mikepaul-LuaJIT
1
0
Fork 0
mirror of https://github.com/LuaJIT/LuaJIT.git synced 2025-02-08 07:34:07 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

Add support for multiplication.

Browse Source 
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

41
src/vm_s390x.dasc
View File

@ -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)