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Allow any general purpose register to hold an SImode (or smaller) value.

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From-SVN: r49213
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Nick Clifton 2002-01-25 11:44:12 +00:00 committed by Nick Clifton
parent 72c7c913b4
commit 55492b32d7
2 changed files with 18 additions and 17 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2002-01-25 Nick Clifton <nickc@cambridge.redhat.com>
* config/arm/arm.c (arm_hard_regno_mode_ok): Allow any general
purpose register to hold an SImode (or smaller) value.
2002-01-25 Jakub Jelinek <jakub@redhat.com>
* unwind-dw2-fde-glibc.c: If inhibit_libc, use __register_frame*

30
gcc/config/arm/arm.c
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@ -9139,24 +9139,20 @@ arm_hard_regno_mode_ok (regno, mode)
return (NUM_REGS (mode) < 2) || (regno < LAST_LO_REGNUM);
if (regno <= LAST_ARM_REGNUM)
/* If the register is a general purpose ARM register we allow
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. */
{
/* 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");
/* We allow an SImode or smaller value to be stored in any
general purpose register. This does not mean, for example
that GCC will choose to store a variable in the stack pointer
since it is a fixed register. But it is important to allow
access to these special registers, so that they can be
referenced from C code via the asm assembler alias, eg:
This expression is actually used in newlib... */
if (mode == SImode && regno == SP_REGNUM)
return 1;
return regno < (SP_REGNUM - (unsigned) NUM_REGS (mode));
}
register char * stack_ptr asm ("sp");
For any mode requiring more than one register to hold the
value we restrict the choice so that r13, r14, and r15
cannot be part of the register set. */
return (NUM_REGS (mode) <= 1)
|| (regno < (SP_REGNUM - (unsigned) NUM_REGS (mode)));
if ( regno == FRAME_POINTER_REGNUM
|| regno == ARG_POINTER_REGNUM)