71 lines
2.3 KiB
Diff
71 lines
2.3 KiB
Diff
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From 946f9153a5d813301b05fb56a75e2c7ce22a6c2a Mon Sep 17 00:00:00 2001
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From: Xi Ruoyao <xry111@xry111.site>
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Date: Sun, 25 Feb 2024 20:44:34 +0800
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Subject: [PATCH 140/188] LoongArch: Remove unneeded sign extension after
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crc/crcc instructions
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The specification of crc/crcc instructions is clear that the output is
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sign-extended to GRLEN. Add a define_insn to tell the compiler this
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fact and allow it to remove the unneeded sign extension on crc/crcc
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output. As crc/crcc instructions are usually used in a tight loop,
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this should produce a significant performance gain.
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gcc/ChangeLog:
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* config/loongarch/loongarch.md
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(loongarch_<crc>_w_<size>_w_extended): New define_insn.
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gcc/testsuite/ChangeLog:
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* gcc.target/loongarch/crc-sext.c: New test;
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---
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gcc/config/loongarch/loongarch.md | 11 +++++++++++
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gcc/testsuite/gcc.target/loongarch/crc-sext.c | 13 +++++++++++++
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2 files changed, 24 insertions(+)
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create mode 100644 gcc/testsuite/gcc.target/loongarch/crc-sext.c
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diff --git a/gcc/config/loongarch/loongarch.md b/gcc/config/loongarch/loongarch.md
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index b5ad9eada..248ad12bb 100644
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--- a/gcc/config/loongarch/loongarch.md
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+++ b/gcc/config/loongarch/loongarch.md
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@@ -4264,6 +4264,17 @@
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[(set_attr "type" "unknown")
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(set_attr "mode" "<MODE>")])
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+(define_insn "loongarch_<crc>_w_<size>_w_extended"
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+ [(set (match_operand:DI 0 "register_operand" "=r")
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+ (sign_extend:DI
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+ (unspec:SI [(match_operand:QHSD 1 "register_operand" "r")
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+ (match_operand:SI 2 "register_operand" "r")]
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+ CRC)))]
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+ "TARGET_64BIT"
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+ "<crc>.w.<size>.w\t%0,%1,%2"
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+ [(set_attr "type" "unknown")
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+ (set_attr "mode" "<MODE>")])
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+
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;; With normal or medium code models, if the only use of a pc-relative
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;; address is for loading or storing a value, then relying on linker
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;; relaxation is not better than emitting the machine instruction directly.
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diff --git a/gcc/testsuite/gcc.target/loongarch/crc-sext.c b/gcc/testsuite/gcc.target/loongarch/crc-sext.c
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new file mode 100644
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index 000000000..9ade5a8e4
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--- /dev/null
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+++ b/gcc/testsuite/gcc.target/loongarch/crc-sext.c
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@@ -0,0 +1,13 @@
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+/* { dg-do compile } */
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+/* { dg-options "-O2 -march=loongarch64" } */
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+/* { dg-final { check-function-bodies "**" "" } } */
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+
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+/*
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+**my_crc:
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+** crc.w.d.w \$r4,\$r4,\$r5
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+** jr \$r1
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+*/
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+int my_crc(long long dword, int crc)
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+{
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+ return __builtin_loongarch_crc_w_d_w(dword, crc);
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+}
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--
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2.43.0
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