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* [glibc] LoongArch: Micro-optimize LD_PCREL
@ 2023-08-29 4:33 Yinyu Cai
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From: Yinyu Cai @ 2023-08-29 4:33 UTC (permalink / raw)
To: glibc-cvs
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=3efa26749e4d28768558330353dc15c6f325ed4e
commit 3efa26749e4d28768558330353dc15c6f325ed4e
Author: Xi Ruoyao <xry111@xry111.site>
Date: Sun Aug 27 00:36:51 2023 +0800
LoongArch: Micro-optimize LD_PCREL
We are requiring Binutils >= 2.41, so explicit relocation syntax is
always supported by the assembler. Use it to reduce one instruction.
Signed-off-by: Xi Ruoyao <xry111@xry111.site>
Diff:
---
sysdeps/unix/sysv/linux/loongarch/pointer_guard.h | 10 ++++------
1 file changed, 4 insertions(+), 6 deletions(-)
diff --git a/sysdeps/unix/sysv/linux/loongarch/pointer_guard.h b/sysdeps/unix/sysv/linux/loongarch/pointer_guard.h
index b25e353b37..d6c78687d4 100644
--- a/sysdeps/unix/sysv/linux/loongarch/pointer_guard.h
+++ b/sysdeps/unix/sysv/linux/loongarch/pointer_guard.h
@@ -19,17 +19,15 @@
#ifndef POINTER_GUARD_H
#define POINTER_GUARD_H
-/* Load a got-relative EXPR into G, using T.
- Note G and T are register names. */
+/* Load a got-relative EXPR into register G. */
#define LD_GLOBAL(G, EXPR) \
la.global G, EXPR; \
REG_L G, G, 0;
-/* Load a pc-relative EXPR into G, using T.
- Note G and T are register names. */
+/* Load a pc-relative EXPR into register G. */
#define LD_PCREL(G, EXPR) \
- la.pcrel G, EXPR; \
- REG_L G, G, 0;
+ pcalau12i G, %pc_hi20(EXPR); \
+ REG_L G, G, %pc_lo12(EXPR);
#if (IS_IN (rtld) \
|| (!defined SHARED && (IS_IN (libc) \
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