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- From 09463827001a7b8094f4b9460514370a1876d908 Mon Sep 17 00:00:00 2001
- From: Claudiu Zissulescu <claziss@synopsys.com>
- Date: Wed, 20 Jan 2016 16:32:40 +0100
- Subject: [PATCH] Don't allow mcompact-casesi for ARCv2
- The compact casesi is not working for arcv2 processors family as it
- makes use of the add_s rx,rx,pcl instruction which is only valid for
- arc6xx and arc700 processors. Also not having this instruction makes
- no much sens to change the compact-casesi pattern to use normal add
- instructions as it nullifies the advantage of short instruction use.
- The default casesi pattern betters suits the arcv2 architecture.
- The fix is done in development tree: [arc-4.8-dev 0946382]
- and will be a part of the next release of ARC GNU tools.
- Once that new release happens this patch must be removed.
- gcc/
- 2016-01-20 Claudiu Zissulescu <claziss@synopsys.com>
- * common/config/arc/arc-common.c (arc_option_optimization_table):
- Remove mcompact-casesi option.
- * config/arc/arc.c (arc_override_options): Use compact-casesi only
- for arcv1.
- * config/arc/arc.md (casesi_load): Use short instructions.
- ---
- gcc/common/config/arc/arc-common.c | 1 -
- gcc/config/arc/arc.c | 9 +++++----
- gcc/config/arc/arc.md | 10 ++++++++--
- 3 files changed, 13 insertions(+), 7 deletions(-)
-
- * config/arc/arc.c (arc_legitimize_pic_address): Handle MINUS
- diff --git a/gcc/common/config/arc/arc-common.c b/gcc/common/config/arc/arc-common.c
- index e2e36fa..310bc80 100644
- --- a/gcc/common/config/arc/arc-common.c
- +++ b/gcc/common/config/arc/arc-common.c
- @@ -58,7 +58,6 @@ static const struct default_options arc_option_optimization_table[] =
- { OPT_LEVELS_ALL, OPT_mbbit_peephole, NULL, 1 },
- { OPT_LEVELS_SIZE, OPT_mq_class, NULL, 1 },
- { OPT_LEVELS_SIZE, OPT_mcase_vector_pcrel, NULL, 1 },
- - { OPT_LEVELS_SIZE, OPT_mcompact_casesi, NULL, 1 },
- { OPT_LEVELS_NONE, 0, NULL, 0 }
- };
-
- diff --git a/gcc/config/arc/arc.c b/gcc/config/arc/arc.c
- index 18d88a3..f828398 100644
- --- a/gcc/config/arc/arc.c
- +++ b/gcc/config/arc/arc.c
- @@ -1151,6 +1151,11 @@ arc_override_options (void)
- if (arc_size_opt_level == 3)
- optimize_size = 1;
-
- + if (TARGET_V2)
- + TARGET_COMPACT_CASESI = 0;
- + else if (optimize_size == 1)
- + TARGET_COMPACT_CASESI = 1;
- +
- if (flag_pic)
- target_flags |= MASK_NO_SDATA_SET;
-
- @@ -1163,10 +1168,6 @@ arc_override_options (void)
- if (!TARGET_Q_CLASS)
- TARGET_COMPACT_CASESI = 0;
-
- - /* For the time being don't support COMPACT_CASESI for ARCv2. */
- - if (TARGET_V2)
- - TARGET_COMPACT_CASESI = 0;
- -
- if (TARGET_COMPACT_CASESI)
- TARGET_CASE_VECTOR_PC_RELATIVE = 1;
-
- diff --git a/gcc/config/arc/arc.md b/gcc/config/arc/arc.md
- index bc4ac38..ba7c8bc 100644
- --- a/gcc/config/arc/arc.md
- +++ b/gcc/config/arc/arc.md
- @@ -3837,14 +3837,20 @@
- switch (GET_MODE (diff_vec))
- {
- case SImode:
- - return \"ld.as %0,[%1,%2]%&\";
- + if ((which_alternative == 0) && TARGET_CODE_DENSITY)
- + return \"ld_s.as %0,[%1,%2]%&\";
- + else
- + return \"ld.as %0,[%1,%2]%&\";
- case HImode:
- if (ADDR_DIFF_VEC_FLAGS (diff_vec).offset_unsigned)
- return \"ldw.as %0,[%1,%2]\";
- return \"ldw.x.as %0,[%1,%2]\";
- case QImode:
- if (ADDR_DIFF_VEC_FLAGS (diff_vec).offset_unsigned)
- - return \"ldb%? %0,[%1,%2]%&\";
- + if (which_alternative == 0)
- + return \"ldb_s %0,[%1,%2]%&\";
- + else
- + return \"ldb %0,[%1,%2]%&\";
- return \"ldb.x %0,[%1,%2]\";
- default:
- gcc_unreachable ();
- --
- 2.5.0
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