From: Tom de Vries <Tom_deVries@mentor.com>
To: <rdsandiford@googlemail.com>
Cc: Vladimir Makarov <vmakarov@redhat.com>,
gcc-patches <gcc-patches@gcc.gnu.org>
Subject: [PATCH] -fuse-caller-save - Implement TARGET_FN_OTHER_HARD_REG_USAGE hook for MIPS
Date: Sat, 07 Dec 2013 15:07:00 -0000 [thread overview]
Message-ID: <52A33995.4090002@mentor.com> (raw)
In-Reply-To: <20130330171115.720D3421213@build1-lucid-cs>
[-- Attachment #1: Type: text/plain, Size: 291 bytes --]
Richard,
This patch implements the target hook TARGET_FN_OTHER_HARD_REG_USAGE (posted
here: http://gcc.gnu.org/ml/gcc-patches/2013-03/msg01318.html) for MIPS, to
address the issue that $6 is sometimes used in split calls.
Build and reg-tested on MIPS.
OK for stage1?
Thanks,
- Tom
[-- Attachment #2: fuse-caller-save-mips.patch --]
[-- Type: text/x-patch, Size: 3399 bytes --]
2013-11-12 Chung-Lin Tang <cltang@codesourcery.com>
Tom de Vries <tom@codesourcery.com>
* config/mips/mips.c (POST_CALL_TMP_REG): Define.
(mips_split_call): Use POST_CALL_TMP_REG.
(mips_fn_other_hard_reg_usage): New function.
(TARGET_FN_OTHER_HARD_REG_USAGE): Define targhook using new function.
diff --git a/gcc/config/mips/mips.c b/gcc/config/mips/mips.c
index 36ba6df..3f60f5b 100644
--- a/gcc/config/mips/mips.c
+++ b/gcc/config/mips/mips.c
@@ -175,6 +175,11 @@ along with GCC; see the file COPYING3. If not see
/* Return the usual opcode for a nop. */
#define MIPS_NOP 0
+/* Temporary register that is used after a call, and suitable for both
+ MIPS16 and non-MIPS16 code. $4 and $5 are used for returning complex double
+ values in soft-float code, so $6 is the first suitable candidate. */
+#define POST_CALL_TMP_REG (GP_ARG_FIRST + 2)
+
/* Classifies an address.
ADDRESS_REG
@@ -6990,10 +6995,8 @@ mips_split_call (rtx insn, rtx call_pattern)
{
emit_call_insn (call_pattern);
if (!find_reg_note (insn, REG_NORETURN, 0))
- /* Pick a temporary register that is suitable for both MIPS16 and
- non-MIPS16 code. $4 and $5 are used for returning complex double
- values in soft-float code, so $6 is the first suitable candidate. */
- mips_restore_gp_from_cprestore_slot (gen_rtx_REG (Pmode, GP_ARG_FIRST + 2));
+ mips_restore_gp_from_cprestore_slot (gen_rtx_REG (Pmode,
+ POST_CALL_TMP_REG));
}
/* Return true if a call to DECL may need to use JALX. */
@@ -18699,6 +18702,32 @@ mips_case_values_threshold (void)
else
return default_case_values_threshold ();
}
+
+/* Implement TARGET_FN_OTHER_HARD_REG_USAGE. */
+
+static void
+mips_fn_other_hard_reg_usage (struct hard_reg_set_container *fn_used_regs)
+{
+ /* POST_CALL_TMP_REG is used in splitting calls after register allocation.
+ With -fno-use-caller-save, the register is available because register
+ allocation ensures that members of call_used_regs are not live across
+ calls.
+ With -fuse-caller-save that's not the case, so we're missing a clobber on
+ the unsplit call insn to tell register allocation that the register is used
+ by the split call insn(s) after register allocation (we don't need the
+ clobber for a non-returning call, but we don't expect there will be a
+ penalty if we add the clobber for both returning and non-returning calls).
+
+ For the sake of simplicity we don't add the individual clobbers, but we use
+ this hook to mark the reg as clobbered. This is a bit ugly, since this
+ hook is called during the final pass on a function, and we're expressing
+ here that the insn after a call to this function will clobber a register.
+
+ The condition is the pass-independent part of TARGET_SPLIT_CALLS. */
+ if (TARGET_EXPLICIT_RELOCS
+ && TARGET_CALL_CLOBBERED_GP)
+ SET_HARD_REG_BIT (fn_used_regs->set, POST_CALL_TMP_REG);
+}
\f
/* Initialize the GCC target structure. */
#undef TARGET_ASM_ALIGNED_HI_OP
@@ -18933,6 +18962,9 @@ mips_case_values_threshold (void)
#undef TARGET_CASE_VALUES_THRESHOLD
#define TARGET_CASE_VALUES_THRESHOLD mips_case_values_threshold
+#undef TARGET_FN_OTHER_HARD_REG_USAGE
+#define TARGET_FN_OTHER_HARD_REG_USAGE mips_fn_other_hard_reg_usage
+
struct gcc_target targetm = TARGET_INITIALIZER;
\f
#include "gt-mips.h"
next prev parent reply other threads:[~2013-12-07 15:07 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-25 13:05 [PATCH][IRA] Analysis of register usage of functions for usage by IRA Tom de Vries
2013-01-25 15:46 ` Vladimir Makarov
2013-02-07 19:12 ` Tom de Vries
2013-02-13 22:35 ` Vladimir Makarov
2013-03-14 9:35 ` Tom de Vries
2013-03-14 15:22 ` Vladimir Makarov
2013-03-29 12:54 ` Tom de Vries
2013-03-29 13:06 ` [PATCH][02/10] -fuse-caller-save - Add new reg-note REG_CALL_DECL Tom de Vries
2013-03-29 13:06 ` [PATCH][06/10] -fuse-caller-save - Collect register usage information Tom de Vries
2013-03-29 13:06 ` [PATCH][09/10] -fuse-caller-save - Add documentation Tom de Vries
2013-03-29 13:06 ` [PATCH][08/10] -fuse-caller-save - Enable by default at O2 and higher Tom de Vries
2013-03-29 13:06 ` [PATCH][03/10] -fuse-caller-save - Add implicit parameter to find_all_hard_reg_sets Tom de Vries
2013-03-29 13:06 ` [PATCH][10/10] -fuse-caller-save - Add test-case Tom de Vries
2013-03-29 13:06 ` [PATCH][07/10] -fuse-caller-save - Use collected register usage information Tom de Vries
2013-03-29 13:06 ` [PATCH][01/10] -fuse-caller-save - Add command line option Tom de Vries
2013-03-29 13:06 ` [PATCH][05/10] -fuse-caller-save - Implement TARGET_FN_OTHER_HARD_REG_USAGE hook for ARM Tom de Vries
2013-03-29 13:06 ` [PATCH][04/10] -fuse-caller-save - Add TARGET_FN_OTHER_HARD_REG_USAGE hook Tom de Vries
2013-03-30 16:10 ` [PATCH][IRA] Analysis of register usage of functions for usage by IRA Tom de Vries
2014-01-09 14:42 ` Richard Earnshaw
2014-01-09 20:56 ` Tom de Vries
2014-01-09 21:10 ` Andi Kleen
2014-01-10 0:22 ` Tom de Vries
2014-01-10 11:39 ` Richard Earnshaw
2014-01-10 16:44 ` Tom de Vries
2014-01-13 16:16 ` Tom de Vries
2014-01-14 10:00 ` Richard Earnshaw
2013-03-30 17:11 ` [PATCH][02/10] -fuse-caller-save - Add new reg-note REG_CALL_DECL Tom de Vries
2013-03-30 17:11 ` [PATCH][05/10] -fuse-caller-save - Implement TARGET_FN_OTHER_HARD_REG_USAGE hook for ARM Tom de Vries
2013-12-06 0:54 ` Tom de Vries
2013-12-09 10:03 ` Richard Earnshaw
2013-03-30 17:11 ` [PATCH][06/10] -fuse-caller-save - Collect register usage information Tom de Vries
2013-03-30 17:11 ` [PATCH][01/10] -fuse-caller-save - Add command line option Tom de Vries
2013-03-30 17:11 ` [PATCH][03/10] -fuse-caller-save - Add implicit parameter to find_all_hard_reg_sets Tom de Vries
2013-03-30 17:11 ` [PATCH][04/10] -fuse-caller-save - Add TARGET_FN_OTHER_HARD_REG_USAGE hook Tom de Vries
2013-12-07 15:07 ` Tom de Vries [this message]
2013-12-25 13:02 ` [PATCH] -fuse-caller-save - Implement TARGET_FN_OTHER_HARD_REG_USAGE hook for MIPS Tom de Vries
2014-01-09 13:51 ` [PING^2][PATCH] " Tom de Vries
2014-01-09 15:31 ` Richard Sandiford
2014-01-09 23:43 ` Tom de Vries
2014-01-10 8:47 ` Richard Sandiford
2014-01-13 15:04 ` Tom de Vries
2013-03-30 17:12 ` [PATCH][07/10] -fuse-caller-save - Use collected register usage information Tom de Vries
2013-12-06 0:56 ` Tom de Vries
2013-12-06 9:11 ` Paolo Bonzini
2013-03-30 17:12 ` [PATCH][10/10] -fuse-caller-save - Add test-case Tom de Vries
2013-04-28 10:57 ` Richard Sandiford
2013-12-06 0:34 ` Tom de Vries
2013-12-06 8:51 ` Richard Sandiford
2013-03-30 17:12 ` [PATCH][08/10] -fuse-caller-save - Enable by default at O2 and higher Tom de Vries
2013-03-30 17:12 ` [PATCH][09/10] -fuse-caller-save - Add documentation Tom de Vries
2013-12-06 0:47 ` [PATCH][IRA] Analysis of register usage of functions for usage by IRA Tom de Vries
2014-01-14 19:36 ` Vladimir Makarov
2014-05-30 9:20 ` Tom de Vries
2014-09-01 16:41 ` Ulrich Weigand
2014-09-03 16:58 ` Tom de Vries
2014-09-03 18:12 ` Ulrich Weigand
2014-09-03 22:24 ` Tom de Vries
2014-09-04 7:37 ` Tom de Vries
2014-09-04 14:55 ` Vladimir Makarov
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