From 92a4639e2eeaa74745592505e1e927b8f81b6b85 Mon Sep 17 00:00:00 2001 From: Nick Clifton 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 9bd5fe4b357..aa3fe7bac4e 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +2002-01-24 Nick Clifton + + * config/arm/arm.c (arm_hard_regno_mode_ok): Allow SImode + values to be assigned to the stack pointer. + 2002-01-14 Hartmut Penner * 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 567daa37312..1999af04e4e 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) -- 2.30.2