From: Iain Sandoe <iain@sandoe.co.uk>
Date: Fri, 11 Dec 2020 00:29:42 +0000 (+0000)
Subject: Darwin, PPC : Fix R13 for PPC64.
X-Git-Tag: upstream/12.2.0~4763
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b12d6e79899fd27833c53ffc3c973538244f62e1;p=platform%2Fupstream%2Fgcc.git

Darwin, PPC : Fix R13 for PPC64.

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.
---

diff --git a/gcc/config/rs6000/darwin.h b/gcc/config/rs6000/darwin.h
index 6abf8e8..120b01f 100644
--- a/gcc/config/rs6000/darwin.h
+++ b/gcc/config/rs6000/darwin.h
@@ -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.  */