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Darwin, PPC : Fix R13 for PPC64.

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We have a somewhat unusual situation in that for PPC64, R13 is
both reserved and callee-saved (it is used internally by the
pthreads implementation to contain pthread_self).

So add R13 to the fixed regs, but also keep it in the callee-
saved set.

gcc/ChangeLog:

	* config/rs6000/darwin.h (FIXED_R13): Add for PPC64.
	(FIRST_SAVED_GP_REGNO): Save from R13 even when it is one
	of the fixed regs.
This commit is contained in:
Iain Sandoe 2020-12-11 00:29:42 +00:00
parent 45f775f5f8
commit b12d6e7989
1 changed files with 4 additions and 1 deletions
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5
gcc/config/rs6000/darwin.h
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@ -203,7 +203,7 @@
/* Make both r2 and r13 available for allocation. */
#define FIXED_R2 0
#define FIXED_R13 0
#define FIXED_R13 TARGET_64BIT
/* Base register for access to local variables of the function. */
@ -213,6 +213,9 @@
#undef RS6000_PIC_OFFSET_TABLE_REGNUM
#define RS6000_PIC_OFFSET_TABLE_REGNUM 31
#undef FIRST_SAVED_GP_REGNO
#define FIRST_SAVED_GP_REGNO 13
/* Darwin's stack must remain 16-byte aligned for both 32 and 64 bit
ABIs. */