diff options
Diffstat (limited to 'gcc/sched-deps.c')
| -rw-r--r-- | gcc/sched-deps.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/gcc/sched-deps.c b/gcc/sched-deps.c index 287b826..f818a83 100644 --- a/gcc/sched-deps.c +++ b/gcc/sched-deps.c @@ -2820,6 +2820,37 @@ sched_analyze_2 (struct deps_desc *deps, rtx x, rtx insn) sched_deps_info->finish_rhs (); } +/* Try to group comparison and the following conditional jump INSN if + they're already adjacent. This is to prevent scheduler from scheduling + them apart. */ + +static void +try_group_insn (rtx insn) +{ + unsigned int condreg1, condreg2; + rtx cc_reg_1; + rtx prev; + + if (!any_condjump_p (insn)) + return; + + targetm.fixed_condition_code_regs (&condreg1, &condreg2); + cc_reg_1 = gen_rtx_REG (CCmode, condreg1); + prev = prev_nonnote_nondebug_insn (insn); + if (!reg_referenced_p (cc_reg_1, PATTERN (insn)) + || !prev + || !modified_in_p (cc_reg_1, prev)) + return; + + /* Different microarchitectures support macro fusions for different + combinations of insn pairs. */ + if (!targetm.sched.macro_fusion_pair_p + || !targetm.sched.macro_fusion_pair_p (prev, insn)) + return; + + SCHED_GROUP_P (insn) = 1; +} + /* Analyze an INSN with pattern X to find all dependencies. */ static void sched_analyze_insn (struct deps_desc *deps, rtx x, rtx insn) @@ -2843,6 +2874,11 @@ sched_analyze_insn (struct deps_desc *deps, rtx x, rtx insn) can_start_lhs_rhs_p = (NONJUMP_INSN_P (insn) && code == SET); + /* Group compare and branch insns for macro-fusion. */ + if (targetm.sched.macro_fusion_p + && targetm.sched.macro_fusion_p ()) + try_group_insn (insn); + if (may_trap_p (x)) /* Avoid moving trapping instructions across function calls that might not always return. */ @@ -3733,6 +3769,10 @@ sched_analyze (struct deps_desc *deps, rtx head, rtx tail) { /* And initialize deps_lists. */ sd_init_insn (insn); + /* Clean up SCHED_GROUP_P which may be set by last + scheduler pass. */ + if (SCHED_GROUP_P (insn)) + SCHED_GROUP_P (insn) = 0; } deps_analyze_insn (deps, insn); |