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[SH][committed] Make GBR call preserved by default
- From: Oleg Endo <oleg dot endo at t-online dot de>
- To: gcc-patches <gcc-patches at gcc dot gnu dot org>
- Date: Thu, 16 Oct 2014 14:24:02 +0200
- Subject: [SH][committed] Make GBR call preserved by default
- Authentication-results: sourceware.org; auth=none
Hi,
This is not entirely related to PR 59401, but the discussion came up
there. The attached patch makes the GBR on SH call preserved by
default. Tested by Kaz on sh4-linux, committed as r216314.
Cheers,
Oleg
gcc/ChangeLog:
PR target/59401
* config/sh/sh.h (CALL_REALLY_USED_REGISTERS): Expand macro and set
GBR to 0.
Index: gcc/config/sh/sh.h
===================================================================
--- gcc/config/sh/sh.h (revision 216313)
+++ gcc/config/sh/sh.h (working copy)
@@ -821,9 +821,42 @@
1, 1, 1, 1, \
}
-/* TARGET_CONDITIONAL_REGISTER_USAGE might want to make a register
- call-used, yet fixed, like PIC_OFFSET_TABLE_REGNUM. */
-#define CALL_REALLY_USED_REGISTERS CALL_USED_REGISTERS
+/* CALL_REALLY_USED_REGISTERS is used as a default setting, which is then
+ overridden by -fcall-saved-* and -fcall-used-* options and then by
+ TARGET_CONDITIONAL_REGISTER_USAGE. There we might want to make a
+ register call-used, yet fixed, like PIC_OFFSET_TABLE_REGNUM. */
+#define CALL_REALLY_USED_REGISTERS \
+{ \
+/* Regular registers. */ \
+ 1, 1, 1, 1, 1, 1, 1, 1, \
+ /* R8 and R9 are call-clobbered on SH5, but not on earlier SH ABIs. \
+ Only the lower 32bits of R10-R14 are guaranteed to be preserved \
+ across SH5 function calls. */ \
+ 0, 0, 0, 0, 0, 0, 0, 1, \
+ 1, 1, 1, 1, 1, 1, 1, 1, \
+ 1, 1, 1, 1, 0, 0, 0, 0, \
+ 0, 0, 0, 0, 1, 1, 1, 1, \
+ 1, 1, 1, 1, 0, 0, 0, 0, \
+ 0, 0, 0, 0, 0, 0, 0, 0, \
+ 0, 0, 0, 0, 1, 1, 1, 1, \
+/* FP registers. */ \
+ 1, 1, 1, 1, 1, 1, 1, 1, \
+ 1, 1, 1, 1, 0, 0, 0, 0, \
+ 1, 1, 1, 1, 1, 1, 1, 1, \
+ 1, 1, 1, 1, 1, 1, 1, 1, \
+ 1, 1, 1, 1, 0, 0, 0, 0, \
+ 0, 0, 0, 0, 0, 0, 0, 0, \
+ 0, 0, 0, 0, 0, 0, 0, 0, \
+ 0, 0, 0, 0, 0, 0, 0, 0, \
+/* Branch target registers. */ \
+ 1, 1, 1, 1, 1, 0, 0, 0, \
+/* XD registers. */ \
+ 1, 1, 1, 1, 1, 1, 0, 0, \
+/*"gbr", "ap", "pr", "t", "mach", "macl", "fpul", "fpscr", */ \
+ 0, 1, 1, 1, 1, 1, 1, 1, \
+/*"rap", "sfp","fpscr0","fpscr1" */ \
+ 1, 1, 0, 0, \
+}
/* Only the lower 32-bits of R10-R14 are guaranteed to be preserved
across SHcompact function calls. We can't tell whether a called