From 92a4639e2eeaa74745592505e1e927b8f81b6b85 Mon Sep 17 00:00:00 2001
From: Nick Clifton <nickc@cambridge.redhat.com>
Date: Thu, 24 Jan 2002 16:27:51 +0000
Subject: [PATCH] Allow SImode values to be assigned to the stack pointer.
From-SVN: r49183
---
gcc/ChangeLog | 5 +++++
gcc/config/arm/arm.c | 15 ++++++++++++++-
2 files changed, 19 insertions(+), 1 deletion(-)
diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 9bd5fe4b3577..aa3fe7bac4e0 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2002-01-24 Nick Clifton <nickc@cambridge.redhat.com>
+
+ * config/arm/arm.c (arm_hard_regno_mode_ok): Allow SImode
+ values to be assigned to the stack pointer.
+
2002-01-14 Hartmut Penner <hpenner@de.ibm.com>
* emit_rtl.c (gen_lowpart_common): Conversion from const_int
diff --git a/gcc/config/arm/arm.c b/gcc/config/arm/arm.c
index 567daa373128..1999af04e4ee 100644
--- a/gcc/config/arm/arm.c
+++ b/gcc/config/arm/arm.c
@@ -9143,7 +9143,20 @@ arm_hard_regno_mode_ok (regno, mode)
it only if it not a special register (SP, LR, PC) and only
if there will be enough (non-special) registers to hold the
entire value. */
- return regno < (SP_REGNUM - (unsigned) NUM_REGS (mode));
+ {
+ /* As a special exception we allow an SImode value to be
+ "assigned" to the stack pointer. This is not intended
+ to actually allow a value to be stored in the SP, but so
+ that the stack pointer can be referenced from C code like
+ this:
+
+ register char * stack_ptr asm ("sp");
+
+ This expression is actually used in newlib... */
+ if (mode == SImode && regno == SP_REGNUM)
+ return 1;
+ return regno < (SP_REGNUM - (unsigned) NUM_REGS (mode));
+ }
if ( regno == FRAME_POINTER_REGNUM
|| regno == ARG_POINTER_REGNUM)
--
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