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Strength-reduce 32 to 64 bit widening using scalar evolution analysis.

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This commit is contained in:
Mike Pall
2010-12-09 16:12:59 +01:00
parent 36fed9f3e1
commit 1d86090926
2 changed files with 49 additions and 6 deletions
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10
src/lj_crecord.c
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@@ -335,15 +335,17 @@ void LJ_FASTCALL recff_cdata_index(jit_State *J, RecordFFData *rd)
IRIns *ir = IR(tref_ref(idx));
if (LJ_LIKELY(J->flags & JIT_F_OPT_FOLD) &&
ir->o == IR_ADD && irref_isk(ir->op2)) {
IRIns *irk = IR(ir->op2);
idx = ir->op1;
/* This would be rather difficult in FOLD, so do it here:
** (base+(idx+k)*sz)+ofs ==> (base+idx*sz)+(ofs+k*sz)
*/
idx = ir->op1;
#if LJ_64
ofs += (int64_t)ir_kint64(IR(ir->op2))->u64 * sz;
#else
ofs += IR(ir->op2)->i * sz;
if (irk->o == IR_KINT64)
ofs += (ptrdiff_t)ir_kint64(irk)->u64 * sz;
else
#endif
ofs += (ptrdiff_t)irk->i * sz;
}
idx = emitir(IRT(IR_MUL, IRT_INTP), idx, lj_ir_kintp(J, sz));
ptr = emitir(IRT(IR_ADD, IRT_PTR), idx, ptr);