Hi,
We have a somewhat unusual situation in that for PPC64, R13 is
both reserved for future use by the ABI document and callee-saved.
In fact, it is already 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.
tested on powerpc-darwin9, pushed to master,
thanks
Iain
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.
---
gcc/config/rs6000/darwin.h | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/gcc/config/rs6000/darwin.h b/gcc/config/rs6000/darwin.h
index 6abf8e84f54..120b01f9a2b 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. */
--
2.24.3 (Apple Git-128)
