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Allow SImode values to be assigned to the stack pointer.

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From-SVN: r49183
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Nick Clifton 2002-01-24 16:27:51 +00:00 committed by Nick Clifton
parent 467cb2da56
commit 92a4639e2e
2 changed files with 19 additions and 1 deletions
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5
gcc/ChangeLog
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@ -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

15
gcc/config/arm/arm.c
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@ -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)