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Only optimize (a - (-b)) into (a + b) when the unary operand is a negation. This fixes (a - (!b)) being turned into (a + b).

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This commit is contained in:
Dale Weiler 2013-12-08 19:01:44 -05:00
parent 50f905b821
commit 58cd326d85
1 changed files with 12 additions and 9 deletions
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21
ast.c
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@ -442,17 +442,20 @@ ast_binary* ast_binary_new(lex_ctx_t ctx, int op,
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;
ast_unary *unary = ((ast_unary*)right);
ast_expression *normal = unary->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];
if (unary->op == VINSTR_NEG_F || unary->op == VINSTR_NEG_V) {
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];
}
}
}