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Whoopsies, I dropped this

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mid 2024-06-13 09:56:30 +03:00
parent 012320569e
commit 07f6d57aba
1 changed files with 35 additions and 0 deletions
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src/x86.h Normal file
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#pragma once
// Can expression be expressed as a single x86 operand?
#define XOP_NOT_XOP 0
#define XOP_NOT_MEM 1
#define XOP_MEM 2
static inline int is_xop(AST *e) {
if(e->nodeKind == AST_EXPR_PRIMITIVE) {
return XOP_NOT_MEM;
} else if(e->nodeKind == AST_EXPR_VAR) {
return e->exprVar.thing->kind == VARTABLEENTRY_VAR ? XOP_NOT_MEM : XOP_MEM;
} else if(e->nodeKind == AST_EXPR_UNARY_OP && e->exprUnOp.operator == UNOP_DEREF && e->exprUnOp.operand->nodeKind == AST_EXPR_BINARY_OP && e->exprUnOp.operand->exprBinOp.operator == BINOP_ADD && e->exprUnOp.operand->exprBinOp.operands[0]->nodeKind == AST_EXPR_VAR && e->exprUnOp.operand->exprBinOp.operands[1]->nodeKind == AST_EXPR_VAR && e->exprUnOp.operand->exprBinOp.operands[0]->exprVar.thing->kind == VARTABLEENTRY_VAR && e->exprUnOp.operand->exprBinOp.operands[1]->exprVar.thing->kind == VARTABLEENTRY_VAR) {
return XOP_MEM;
} else if(e->nodeKind == AST_EXPR_UNARY_OP && e->exprUnOp.operator == UNOP_REF && e->exprUnOp.operand->nodeKind == AST_EXPR_VAR && e->exprUnOp.operand->exprVar.thing->kind == VARTABLEENTRY_SYMBOL) {
return XOP_NOT_MEM;
} else if(e->nodeKind == AST_EXPR_UNARY_OP && e->exprUnOp.operator == UNOP_DEREF) {
AST *c = e->exprUnOp.operand;
if(c->nodeKind == AST_EXPR_VAR && c->exprVar.thing->kind == VARTABLEENTRY_VAR) {
return XOP_MEM;
} else if(c->nodeKind == AST_EXPR_BINARY_OP && c->exprBinOp.operator == BINOP_ADD && c->exprBinOp.operands[0]->nodeKind == AST_EXPR_UNARY_OP && c->exprBinOp.operands[0]->exprUnOp.operator == UNOP_REF && c->exprBinOp.operands[0]->exprUnOp.operand->nodeKind == AST_EXPR_VAR) {
if(c->exprBinOp.operands[1]->nodeKind == AST_EXPR_VAR) {
return XOP_MEM;
} else if(c->exprBinOp.operands[1]->nodeKind == AST_EXPR_BINARY_OP && c->exprBinOp.operands[1]->exprBinOp.operator == BINOP_MUL && c->exprBinOp.operands[1]->exprBinOp.operands[0]->nodeKind == AST_EXPR_PRIMITIVE && c->exprBinOp.operands[1]->exprBinOp.operands[1]->nodeKind == AST_EXPR_VAR) {
int scale = c->exprBinOp.operands[1]->exprBinOp.operands[0]->exprPrim.val;
if(scale == 1 || scale == 2 || scale == 4 || scale == 8) {
return XOP_MEM;
}
}
}
}
return XOP_NOT_XOP;
}