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From: Ivo R. <ir...@so...> - 2017-09-09 11:22:47
|
https://sourceware.org/git/gitweb.cgi?p=valgrind.git;h=1639d6c7830261c3be1bc402a6a4cd3cef487077 commit 1639d6c7830261c3be1bc402a6a4cd3cef487077 Author: Ivo Raisr <iv...@iv...> Date: Mon Sep 4 09:21:05 2017 +0200 Small performance enhancement to VEX register allocator v2. Iterate only over real registers of the target hreg class. Diff: --- VEX/priv/host_generic_reg_alloc2.c | 40 ++++++++++++++++++++------------------ 1 file changed, 21 insertions(+), 19 deletions(-) diff --git a/VEX/priv/host_generic_reg_alloc2.c b/VEX/priv/host_generic_reg_alloc2.c index ec291d3..eb4600e 100644 --- a/VEX/priv/host_generic_reg_alloc2.c +++ b/VEX/priv/host_generic_reg_alloc2.c @@ -162,23 +162,25 @@ typedef spill, or -1 if none was found. */ static Int findMostDistantlyMentionedVReg ( - HRegUsage* reg_usages_in, - Int search_from_instr, - Int num_instrs, - RRegState* state, - Int n_state + HRegUsage* reg_usages_in, + Int search_from_instr, + Int num_instrs, + RRegState* rreg_state, + HRegClass hreg_class, + const RegAllocControl* con ) { - Int k, m; + Int m; Int furthest_k = -1; Int furthest = -1; vassert(search_from_instr >= 0); - for (k = 0; k < n_state; k++) { - if (!state[k].is_spill_cand) + for (UInt k = con->univ->allocable_start[hreg_class]; + k <= con->univ->allocable_end[hreg_class]; k++) { + if (!rreg_state[k].is_spill_cand) continue; - vassert(state[k].disp == Bound); + vassert(rreg_state[k].disp == Bound); for (m = search_from_instr; m < num_instrs; m++) { - if (HRegUsage__contains(®_usages_in[m], state[k].vreg)) + if (HRegUsage__contains(®_usages_in[m], rreg_state[k].vreg)) break; } if (m > furthest) { @@ -210,7 +212,7 @@ static void ensureRRLRspace_SLOW ( RRegLR** info, Int* size, Int used ) Int k; RRegLR* arr2; if (0) - vex_printf("ensureRRISpace: %d -> %d\n", *size, 2 * *size); + vex_printf("ensureRRLRspace: %d -> %d\n", *size, 2 * *size); vassert(used == *size); arr2 = LibVEX_Alloc_inline(2 * *size * sizeof(RRegLR)); for (k = 0; k < *size; k++) @@ -1291,9 +1293,9 @@ HInstrArray* doRegisterAllocation_v2 ( as possible. */ Int k_suboptimal = -1; Int k; - for (k = 0; k < n_rregs; k++) { - if (rreg_state[k].disp != Free - || hregClass(con->univ->regs[k]) != hregClass(vreg)) + for (k = con->univ->allocable_start[hregClass(vreg)]; + k <= con->univ->allocable_end[hregClass(vreg)]; k++) { + if (rreg_state[k].disp != Free) continue; if (rreg_state[k].has_hlrs) { /* Well, at least we can use k_suboptimal if we really @@ -1308,7 +1310,7 @@ HInstrArray* doRegisterAllocation_v2 ( if (k_suboptimal >= 0) k = k_suboptimal; - if (k < n_rregs) { + if (k <= con->univ->allocable_end[hregClass(vreg)]) { rreg_state[k].disp = Bound; rreg_state[k].vreg = vreg; Int p = hregIndex(vreg); @@ -1356,12 +1358,11 @@ HInstrArray* doRegisterAllocation_v2 ( /* First, mark in the rreg_state, those rregs which are not spill candidates, due to holding a vreg mentioned by this instruction. Or being of the wrong class. */ - for (k = 0; k < n_rregs; k++) { + for (k = con->univ->allocable_start[hregClass(vreg)]; + k <= con->univ->allocable_end[hregClass(vreg)]; k++) { rreg_state[k].is_spill_cand = False; if (rreg_state[k].disp != Bound) continue; - if (hregClass(con->univ->regs[k]) != hregClass(vreg)) - continue; rreg_state[k].is_spill_cand = True; /* Note, the following loop visits only the virtual regs mentioned by the instruction. */ @@ -1380,7 +1381,8 @@ HInstrArray* doRegisterAllocation_v2 ( of consequent reloads required. */ Int spillee = findMostDistantlyMentionedVReg ( - reg_usage_arr, ii+1, instrs_in->arr_used, rreg_state, n_rregs ); + reg_usage_arr, ii+1, instrs_in->arr_used, rreg_state, + hregClass(vreg), con); if (spillee == -1) { /* Hmmmmm. There don't appear to be any spill candidates. |