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Constant folding for MUL_OV

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This commit is contained in:
Dmitry Stogov 2022-12-28 09:10:39 +03:00
parent e067ff66f3
commit e710f30170
1 changed files with 32 additions and 1 deletions
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33
ir_fold.h
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@ -541,7 +541,38 @@ IR_FOLD(SUB_OV(C_I64, C_I64))
IR_FOLD_CONST_I(op1_insn->val.i64 - op2_insn->val.i64);
}
//IR_FOLD(MUL_OV(CONST, CONST))
IR_FOLD(MUL_OV(C_U8, C_U8))
IR_FOLD(MUL_OV(C_U16, C_U16))
IR_FOLD(MUL_OV(C_U32, C_U32))
IR_FOLD(MUL_OV(C_U64, C_U64))
{
ir_type type = IR_OPT_TYPE(opt);
uint64_t max = ((uint64_t)0xffffffffffffffff) >> (64 - ir_type_size[type] * 8);
uint64_t res;
IR_ASSERT(IR_OPT_TYPE(opt) == op1_insn->type);
res = op1_insn->val.u64 * op2_insn->val.u64;
if (op1_insn->val.u64 != 0 && res / op1_insn->val.u64 != op2_insn->val.u64 && res <= max) {
IR_FOLD_NEXT;
}
IR_FOLD_CONST_U(res);
}
IR_FOLD(MUL_OV(C_I8, C_I8))
IR_FOLD(MUL_OV(C_I16, C_I16))
IR_FOLD(MUL_OV(C_I32, C_I32))
IR_FOLD(MUL_OV(C_I64, C_I64))
{
ir_type type = IR_OPT_TYPE(opt);
int64_t max = ((uint64_t)0x7fffffffffffffff) >> (64 - ir_type_size[type] * 8);
int64_t min = - max - 1;
int64_t res;
IR_ASSERT(IR_OPT_TYPE(opt) == op1_insn->type);
res = op1_insn->val.i64 * op2_insn->val.i64;
if (op1_insn->val.i64 != 0 && res / op1_insn->val.i64 != op2_insn->val.i64 && res >= min && res <= max) {
IR_FOLD_NEXT;
}
IR_FOLD_CONST_U(res);
}
IR_FOLD(OVERFLOW(_))
{