69 lines
2.5 KiB
Diff
69 lines
2.5 KiB
Diff
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From 89bd94250827f887b38211ac048b4006229dc9c0 Mon Sep 17 00:00:00 2001
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From: ktkachov <ktkachov@138bc75d-0d04-0410-961f-82ee72b054a4>
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Date: Fri, 26 Aug 2016 10:23:20 +0000
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Subject: [PATCH] [ARM] PR target/70473: Reduce size of Cortex-A8 automaton
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PR target/70473
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* config/arm/cortex-a8-neon.md (cortex_a8_vfp_muld): Reduce
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reservation duration to 15 cycles.
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(cortex_a8_vfp_macs): Likewise.
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(cortex_a8_vfp_macd): Likewise.
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(cortex_a8_vfp_divs): Likewise.
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(cortex_a8_vfp_divd): Likewise.
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git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@239772 138bc75d-0d04-0410-961f-82ee72b054a4
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[Backport from gcc upstream commit 79f5d5e3cd5a668d5ecb2b6b0cce80ef5706ac53.]
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Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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---
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gcc/config/arm/cortex-a8-neon.md | 14 +++++++++-----
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1 file changed, 9 insertions(+), 5 deletions(-)
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diff --git a/gcc/config/arm/cortex-a8-neon.md b/gcc/config/arm/cortex-a8-neon.md
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index 04fa01e..4e6d05d 100644
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--- a/gcc/config/arm/cortex-a8-neon.md
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+++ b/gcc/config/arm/cortex-a8-neon.md
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@@ -357,30 +357,34 @@
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(eq_attr "type" "fmuls"))
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"cortex_a8_vfp,cortex_a8_vfplite*11")
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+;; Don't model a reservation for more than 15 cycles as this explodes the
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+;; state space of the automaton for little gain. It is unlikely that the
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+;; scheduler will find enough instructions to hide the full latency of the
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+;; instructions.
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(define_insn_reservation "cortex_a8_vfp_muld" 17
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(and (eq_attr "tune" "cortexa8")
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(eq_attr "type" "fmuld"))
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- "cortex_a8_vfp,cortex_a8_vfplite*16")
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+ "cortex_a8_vfp,cortex_a8_vfplite*15")
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(define_insn_reservation "cortex_a8_vfp_macs" 21
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(and (eq_attr "tune" "cortexa8")
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(eq_attr "type" "fmacs,ffmas"))
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- "cortex_a8_vfp,cortex_a8_vfplite*20")
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+ "cortex_a8_vfp,cortex_a8_vfplite*15")
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(define_insn_reservation "cortex_a8_vfp_macd" 26
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(and (eq_attr "tune" "cortexa8")
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(eq_attr "type" "fmacd,ffmad"))
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- "cortex_a8_vfp,cortex_a8_vfplite*25")
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+ "cortex_a8_vfp,cortex_a8_vfplite*15")
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(define_insn_reservation "cortex_a8_vfp_divs" 37
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(and (eq_attr "tune" "cortexa8")
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(eq_attr "type" "fdivs, fsqrts"))
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- "cortex_a8_vfp,cortex_a8_vfplite*36")
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+ "cortex_a8_vfp,cortex_a8_vfplite*15")
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(define_insn_reservation "cortex_a8_vfp_divd" 65
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(and (eq_attr "tune" "cortexa8")
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(eq_attr "type" "fdivd, fsqrtd"))
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- "cortex_a8_vfp,cortex_a8_vfplite*64")
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+ "cortex_a8_vfp,cortex_a8_vfplite*15")
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;; Comparisons can actually take 7 cycles sometimes instead of four,
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;; but given all the other instructions lumped into type=ffarith that
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--
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2.7.4
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