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Add support for modulo (%) operations.

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Only the slow path for now.
This commit is contained in:
Michael Munday 2016-12-20 14:54:26 -05:00
parent 419869b20e
commit e0e98f94d3
1 changed files with 22 additions and 10 deletions
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32
src/vm_s390x.dasc
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@ -1081,15 +1081,24 @@ static void build_subroutines(BuildCtx *ctx)
|//-- Math helper functions ----------------------------------------------
|//-----------------------------------------------------------------------
|
|.macro vm_round, name, mode, cond
|// FP value rounding. Called by math.floor/math.ceil fast functions.
|// Value to round is in f0. May clobber f0-f7 and r0. Return address is r14.
|.macro vm_round, name, mask
|->name:
| stg r0, 0(r0)
| // TODO: handle edge cases?
| lghi r0, 1
| cdfbr f1, r0
| didbr f0, f2, f1, mask // f0=remainder, f2=quotient.
| jnle >1
| ldr f0, f2
| br r14
|1: // partial remainder (sanity check)
| stg r0, 0(r0)
|.endmacro
|
| vm_round vm_floor, 0, 1
| vm_round vm_ceil, 1, JIT
| vm_round vm_trunc, 2, JIT
| vm_round vm_floor, 7 // Round towards -inf.
| vm_round vm_ceil, 6 // Round towards +inf.
| vm_round vm_trunc, 5 // Round towards 0.
|
|// FP modulo x%y. Called by BC_MOD* and vm_arith.
|->vm_mod:
@ -1335,13 +1344,16 @@ static void build_ins(BuildCtx *ctx, BCOp op, int defop)
case BC_DIVVN: case BC_DIVNV: case BC_DIVVV:
| ins_arithfp ddbr
break;
// TODO: implement fast mod operation.
// x86_64 does floating point mod, however it might be better to use integer mod.
case BC_MODVN:
| stg r0, 0(r0)
| stg r0, 0(r0)
| j ->vmeta_arith_vno
break;
case BC_MODNV: case BC_MODVV:
| stg r0, 0(r0)
| stg r0, 0(r0)
case BC_MODNV:
| j ->vmeta_arith_nvo
break;
case BC_MODVV:
| j ->vmeta_arith_vvo
break;
case BC_POW:
| stg r0, 0(r0)