From: Lulu Cheng <chenglulu@loongson.cn>
Date: Fri, 12 Jan 2024 09:06:30 +0000 (+0800)
Subject: LoongArch: Assign the '/u' attribute to the mem to which the global offset table... 
X-Git-Tag: basepoints/gcc-15~1936
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d78b7bdb9ac0514b542259d0f4c6d623d09fd830;p=thirdparty%2Fgcc.git

LoongArch: Assign the '/u' attribute to the mem to which the global offset table belongs.

gcc/ChangeLog:

	* config/loongarch/loongarch.cc (loongarch_split_symbol):
	Assign the '/u' attribute to the mem.

gcc/testsuite/ChangeLog:

	* g++.target/loongarch/got-load.C: New test.
---

diff --git a/gcc/config/loongarch/loongarch.cc b/gcc/config/loongarch/loongarch.cc
index 3b8559bfdc85..824674742883 100644
--- a/gcc/config/loongarch/loongarch.cc
+++ b/gcc/config/loongarch/loongarch.cc
@@ -3202,6 +3202,11 @@ loongarch_split_symbol (rtx temp, rtx addr, machine_mode mode, rtx *low_out)
 	      rtx mem = gen_rtx_MEM (Pmode, low);
 	      *low_out = gen_rtx_UNSPEC (Pmode, gen_rtvec (1, mem),
 					 UNSPEC_LOAD_FROM_GOT);
+
+	      /* Nonzero in a mem, if the memory is statically allocated and
+		 read-only.  A common example of the later is a shared library’s
+		 global offset table.  */
+	      MEM_READONLY_P (mem) = 1;
 	    }
 
 	  break;
diff --git a/gcc/testsuite/g++.target/loongarch/got-load.C b/gcc/testsuite/g++.target/loongarch/got-load.C
new file mode 100644
index 000000000000..20924c739422
--- /dev/null
+++ b/gcc/testsuite/g++.target/loongarch/got-load.C
@@ -0,0 +1,19 @@
+/* { dg-do compile } */
+/* { dg-options "-mabi=lp64d -O2 -mexplicit-relocs -mcmodel=normal -fdump-rtl-expand" } */
+/* { dg-final { scan-rtl-dump-times "mem/u" 2 "expand" } } */
+
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int lr[100005][2];
+
+void
+test(void)
+{
+  int n;
+
+  cin >> n;
+  for (int i = 0; i < n; ++i)
+    cin >> lr[i][0] >> lr[i][1];
+}