From: Michael Beck <beck@ipd.info.uni-karlsruhe.de>
Date: Mon, 16 Oct 2006 11:50:06 +0000 (+0000)
Subject: Do not convert Sub(P, P) into a simple Minus ...
X-Git-Url: http://nsz.repo.hu/git/?a=commitdiff_plain;h=d3f340a51d3cd03c0b34ac6ae33b74eed33e7c3d;p=libfirm

Do not convert Sub(P, P) into a simple Minus ...

[r8350]
---

diff --git a/ir/ir/iropt.c b/ir/ir/iropt.c
index 310e10211..3019dd13a 100644
--- a/ir/ir/iropt.c
+++ b/ir/ir/iropt.c
@@ -2039,7 +2039,8 @@ static ir_node *transform_node_Sub(ir_node *n)
   if (mode_is_float(mode) && (get_irg_fp_model(current_ir_graph) & fp_strict_algebraic))
     return n;
 
-  if (mode_is_num(mode) && (classify_Const(a) == CNST_NULL)) {
+  /* Beware of Sub(P, P) which cannot be optimized into a simple Minus ... */
+  if (mode_is_num(mode) && mode == get_irn_mode(a) && (classify_Const(a) == CNST_NULL)) {
     n = new_rd_Minus(
           get_irn_dbg_info(n),
           current_ir_graph,