From: James E. Wilson <wilson@codesourcery.com>
Date: Wed, 21 Apr 2010 05:29:11 +0000 (+0000)
Subject: re PR rtl-optimization/43520 (gcc.dg/pr43058.c uses way too memory on ia64)
X-Git-Tag: releases/gcc-4.6.0~7749
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=4811db8d424dfb3527a921504c800520ca89ad36;p=thirdparty%2Fgcc.git

re PR rtl-optimization/43520 (gcc.dg/pr43058.c uses way too memory on ia64)

PR rtl-optimization/43520
* ira-lives.c (ira_implicitly_set_insn_hard_regs): Exclude classes with
zero available registers.

From-SVN: r158584
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index cdb7c2b8ad6b..361121be8461 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2010-04-20  James E. Wilson  <wilson@codesourcery.com>
+
+	PR rtl-optimization/43520
+	* ira-lives.c (ira_implicitly_set_insn_hard_regs): Exclude classes with
+	zero available registers.
+
 2010-04-20  Kaveh R. Ghazi  <ghazi@caip.rutgers.edu>
 
 	* builtins.c (fold_builtin_cproj): Fold more cases.
@@ -114,7 +120,6 @@
 
 2010-04-19  James E. Wilson  <wilson@codesourcery.com>
 
-	PR rtl-optimization/43520
 	* config/ia64/ia64.h (FIXED_REGISTERS, CALL_USED_REGISTERS): Make
 	ar.lc fixed and call-used.
 
diff --git a/gcc/ira-lives.c b/gcc/ira-lives.c
index 09316b510f2f..7ced1a7a73db 100644
--- a/gcc/ira-lives.c
+++ b/gcc/ira-lives.c
@@ -805,6 +805,9 @@ ira_implicitly_set_insn_hard_regs (HARD_REG_SET *set)
 			? GENERAL_REGS
 			: REG_CLASS_FROM_CONSTRAINT (c, p));
 		  if (cl != NO_REGS
+		      /* There is no register pressure problem if all of the
+			 regs in this class are fixed.  */
+		      && ira_available_class_regs[cl] != 0
 		      && (ira_available_class_regs[cl]
 			  <= ira_reg_class_nregs[cl][mode]))
 		    IOR_HARD_REG_SET (*set, reg_class_contents[cl]);