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| author | Greta Yorsh <greta.yorsh@arm.com> | 2013-06-26 10:40:40 +0100 |
|---|---|---|
| committer | Greta Yorsh <gretay@gcc.gnu.org> | 2013-06-26 10:40:40 +0100 |
| commit | b24a2ce5b25b5009ac9371b474d25aefc653ebb7 (patch) | |
| tree | 945abfb6f7a7a6873628f9c827fe95234062c366 /gcc/config/arm/arm.c | |
| parent | 1a3fab15bcbd41b0ad326124c49eb62c67287bb2 (diff) | |
| download | gcc-b24a2ce5b25b5009ac9371b474d25aefc653ebb7.zip gcc-b24a2ce5b25b5009ac9371b474d25aefc653ebb7.tar.gz gcc-b24a2ce5b25b5009ac9371b474d25aefc653ebb7.tar.bz2 | |
arm.h (MAX_CONDITIONAL_EXECUTE): Define macro.
2013-06-26 Greta Yorsh <Greta.Yorsh@arm.com>
* config/arm/arm.h (MAX_CONDITIONAL_EXECUTE): Define macro.
* config/arm/arm-protos.h (arm_max_conditional_execute): New
declaration.
(tune_params): Update comment.
* config/arm/arm.c (arm_cortex_a15_tune): Set max_cond_insns to 2.
(arm_max_conditional_execute): New function.
(thumb2_final_prescan_insn): Use max_insn_skipped and
MAX_INSN_PER_IT_BLOCK to compute maximum instructions in a block.
From-SVN: r200419
Diffstat (limited to 'gcc/config/arm/arm.c')
| -rw-r--r-- | gcc/config/arm/arm.c | 19 |
1 files changed, 16 insertions, 3 deletions
diff --git a/gcc/config/arm/arm.c b/gcc/config/arm/arm.c index 88187ab..e6fd420 100644 --- a/gcc/config/arm/arm.c +++ b/gcc/config/arm/arm.c @@ -1059,7 +1059,7 @@ const struct tune_params arm_cortex_a15_tune = arm_9e_rtx_costs, NULL, 1, /* Constant limit. */ - 5, /* Max cond insns. */ + 2, /* Max cond insns. */ ARM_PREFETCH_NOT_BENEFICIAL, false, /* Prefer constant pool. */ arm_default_branch_cost, @@ -9145,6 +9145,12 @@ arm_adjust_cost (rtx insn, rtx link, rtx dep, int cost) return cost; } +int +arm_max_conditional_execute (void) +{ + return max_insns_skipped; +} + static int arm_default_branch_cost (bool speed_p, bool predictable_p ATTRIBUTE_UNUSED) { @@ -19567,6 +19573,13 @@ thumb2_final_prescan_insn (rtx insn) enum arm_cond_code code; int n; int mask; + int max; + + /* Maximum number of conditionally executed instructions in a block + is minimum of the two max values: maximum allowed in an IT block + and maximum that is beneficial according to the cost model and tune. */ + max = (max_insns_skipped < MAX_INSN_PER_IT_BLOCK) ? + max_insns_skipped : MAX_INSN_PER_IT_BLOCK; /* Remove the previous insn from the count of insns to be output. */ if (arm_condexec_count) @@ -19609,9 +19622,9 @@ thumb2_final_prescan_insn (rtx insn) /* ??? Recognize conditional jumps, and combine them with IT blocks. */ if (GET_CODE (body) != COND_EXEC) break; - /* Allow up to 4 conditionally executed instructions in a block. */ + /* Maximum number of conditionally executed instructions in a block. */ n = get_attr_ce_count (insn); - if (arm_condexec_masklen + n > MAX_INSN_PER_IT_BLOCK) + if (arm_condexec_masklen + n > max) break; predicate = COND_EXEC_TEST (body); |