From: Jan Hubicka <jh@suse.cz>
Date: Fri, 19 Apr 2002 14:02:06 +0000 (+0200)
Subject: i386.md (movsi_1, movhi_1): Force reload to use more flexible alternative.
X-Git-Tag: releases/gcc-3.3.0~5594
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=de80110b8836fd153e11d858b904b396f4b8960d;p=thirdparty%2Fgcc.git

i386.md (movsi_1, movhi_1): Force reload to use more flexible alternative.

	* i386.md (movsi_1, movhi_1): Force reload to use more flexible
	alternative.

From-SVN: r52519
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 097cf31ba5b0..0571b4e0ad24 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+Fri Apr 19 15:53:03 CEST 2002  Jan Hubicka  <jh@suse.cz>
+
+	* i386.md (movsi_1, movhi_1): Force reload to use more flexible
+	alternative.
+
 2002-04-19  Neil Booth  <neil@daikokuya.demon.co.uk>
 
 	* builtins.c: Include langhooks.h.
diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md
index 3ebc99757a33..868f4b0127e0 100644
--- a/gcc/config/i386/i386.md
+++ b/gcc/config/i386/i386.md
@@ -1733,8 +1733,13 @@
    (set_attr "mode" "SI")
    (set_attr "length_immediate" "1")])
 
+; The first alternative is used only to compute proper length of instruction.
+; Reload's algorithm does not take into account the cost of spill instructions
+; needed to free register in given class, so avoid it from choosing the first
+; alternative when eax is not available.
+
 (define_insn "*movsi_1"
-  [(set (match_operand:SI 0 "nonimmediate_operand" "=*a,r,*a,m,!*y,!rm,!*y,!*Y,!rm,!*Y")
+  [(set (match_operand:SI 0 "nonimmediate_operand" "=*?a,r,*?a,m,!*y,!rm,!*y,!*Y,!rm,!*Y")
 	(match_operand:SI 1 "general_operand" "im,rinm,rinm,rin,rm,*y,*y,rm,*Y,*Y"))]
   "GET_CODE (operands[0]) != MEM || GET_CODE (operands[1]) != MEM"
 {
@@ -1843,8 +1848,13 @@
   [(set_attr "type" "push")
    (set_attr "mode" "QI")])
 
+; The first alternative is used only to compute proper length of instruction.
+; Reload's algorithm does not take into account the cost of spill instructions
+; needed to free register in given class, so avoid it from choosing the first
+; alternative when eax is not available.
+
 (define_insn "*movhi_1"
-  [(set (match_operand:HI 0 "nonimmediate_operand" "=*a,r,r,*a,r,m")
+  [(set (match_operand:HI 0 "nonimmediate_operand" "=*?a,r,r,*?a,r,m")
 	(match_operand:HI 1 "general_operand" "i,r,rn,rm,rm,rn"))]
   "GET_CODE (operands[0]) != MEM || GET_CODE (operands[1]) != MEM"
 {