From patchwork Tue Aug 17 07:27:59 2010
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Subject: : Fix PR45296, register long double ICE at -O2, -Os, -O3
Date: Mon, 16 Aug 2010 21:27:59 -0000
From: Uros Bizjak <ubizjak@gmail.com>
X-Patchwork-Id: 61867
Message-Id: <AANLkTinsKsYpdXKBXoHmApqz+LG_YXuvHhvDjcUGwLat@mail.gmail.com>
To: gcc-patches@gcc.gnu.org

Hello!

We should reject stack registers as global registers, otherwise stack
compensation code ICEs.

2010-08-17  Uros Bizjak  <ubizjak@gmail.com>

	PR target/45296
	* reginfo.c (globalize_reg): Reject stack registers.

testsuite/ChangeLog:

2010-08-17  Uros Bizjak  <ubizjak@gmail.com>

	PR target/45296
	* gcc.target/i386/pr45296.c: New test.

Tested on x86_64-pc-linux-gnu {,-m32}. OK for mainline and release branches?

Uros.


Index: testsuite/gcc.target/i386/pr45296.c
===================================================================
--- testsuite/gcc.target/i386/pr45296.c	(revision 0)
+++ testsuite/gcc.target/i386/pr45296.c	(revision 0)
@@ -0,0 +1 @@
+register long double F80 __asm__("st"); /* { dg-error "stack register" } */
Index: reginfo.c
===================================================================
--- reginfo.c	(revision 163291)
+++ reginfo.c	(working copy)
@@ -798,6 +798,14 @@ fix_register (const char *name, int fixe
 void
 globalize_reg (int i)
 {
+#ifdef STACK_REGS
+  if (IN_RANGE (i, FIRST_STACK_REG, LAST_STACK_REG))
+    {
+      error ("stack register used for global register variable");
+      return;
+    }
+#endif
+
   if (fixed_regs[i] == 0 && no_global_reg_vars)
     error ("global register variable follows a function definition");