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strength reduct (a - (-b)) into (a + b)

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Dale Weiler 2013-11-23 13:13:21 -05:00
parent 23904bad52
commit 87a43777ab
1 changed files with 15 additions and 0 deletions
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15
ast.c
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@ -441,6 +441,21 @@ ast_binary* ast_binary_new(lex_ctx_t ctx, int op,
ast_instantiate(ast_binary, ctx, ast_binary_delete);
ast_expression_init((ast_expression*)self, (ast_expression_codegen*)&ast_binary_codegen);
if (ast_istype(right, ast_unary) && OPTS_OPTIMIZATION(OPTIM_PEEPHOLE)) {
ast_expression *normal = ((ast_unary*)right)->operand;
/* make a-(-b) => a + b */
if (op == INSTR_SUB_F) {
op = INSTR_ADD_F;
right = normal;
++opts_optimizationcount[OPTIM_PEEPHOLE];
} else if (op == INSTR_SUB_V) {
op = INSTR_ADD_V;
right = normal;
++opts_optimizationcount[OPTIM_PEEPHOLE];
}
}
self->op = op;
self->left = left;
self->right = right;