From: Michael Beck <beck@ipd.info.uni-karlsruhe.de>
Date: Thu, 11 Sep 2008 23:06:30 +0000 (+0000)
Subject: - fix for r21852: do not remove ALL Conv optimizations,
X-Git-Url: http://nsz.repo.hu/git/?a=commitdiff_plain;h=8b0cea6a7df0f22699b5975bee8282ffe8c10483;p=libfirm

- fix for r21852: do not remove ALL Conv optimizations,
  yust those that causing a problem (Conv to mode_b leading to Phib)

[r21863]
---

diff --git a/ir/ir/iropt.c b/ir/ir/iropt.c
index a301f03f8..16d006dce 100644
--- a/ir/ir/iropt.c
+++ b/ir/ir/iropt.c
@@ -5281,9 +5281,16 @@ static ir_node *transform_node_Conv(ir_node *n) {
 	ir_node *c, *oldn = n;
 	ir_node *a = get_Conv_op(n);
 
-	if (is_Phi(a)) {
-		// let deconv do this
-		return n;
+	if (get_irn_mode(n) != mode_b && is_const_Phi(a)) {
+		/* Do NOT optimize mode_b Conv's, this leads to remaining
+		 * Phib nodes later, because the conv_b_lower operation
+		 * is instantly reverted, when it tries to insert a Convb.
+		 */
+		c = apply_conv_on_phi(a, get_irn_mode(n));
+		if (c) {
+			DBG_OPT_ALGSIM0(oldn, c, FS_OPT_CONST_PHI);
+			return c;
+		}
 	}
 
 	if (is_Unknown(a)) { /* Conv_A(Unknown_B) -> Unknown_A */