opcodes: LoongArch: add "ret" instruction to reduce typing
This syntactic sugar is present in both classical and emerging
architectures, like Alpha, SPARC and RISC-V, and assembler macros
doing the same thing can already be found in the wild e.g. [1], proving
the feature's popularity. It's better to provide support directly in the
assembler so downstream users wouldn't have to re-invent this over and
over again.
[1]: https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/unix/sysv/linux/loongarch/sysdep.h;h=c586df819cd90;hb=HEAD#l28
diff --git a/gas/testsuite/gas/loongarch/jmp_op.d b/gas/testsuite/gas/loongarch/jmp_op.d
index b10390f..218c13f 100644
--- a/gas/testsuite/gas/loongarch/jmp_op.d
+++ b/gas/testsuite/gas/loongarch/jmp_op.d
@@ -28,3 +28,4 @@
[ ]+48:[ ]+6bffb8a4[ ]+[ ]+bltu[ ]+\$a1, \$a0, -72\(0x3ffb8\)[ ]+# 0x0
[ ]+4c:[ ]+6fffb485[ ]+[ ]+bgeu[ ]+\$a0, \$a1, -76\(0x3ffb4\)[ ]+# 0x0
[ ]+50:[ ]+6fffb0a4[ ]+[ ]+bgeu[ ]+\$a1, \$a0, -80\(0x3ffb0\)[ ]+# 0x0
+[ ]+54:[ ]+4c000020[ ]+[ ]+jirl[ ]+\$zero, \$ra, 0
diff --git a/gas/testsuite/gas/loongarch/jmp_op.s b/gas/testsuite/gas/loongarch/jmp_op.s
index 1deb165..56f9867 100644
--- a/gas/testsuite/gas/loongarch/jmp_op.s
+++ b/gas/testsuite/gas/loongarch/jmp_op.s
@@ -20,3 +20,4 @@
bgtu $r4,$r5,.L1
bgeu $r4,$r5,.L1
bleu $r4,$r5,.L1
+ret
diff --git a/ld/testsuite/ld-loongarch-elf/jmp_op.d b/ld/testsuite/ld-loongarch-elf/jmp_op.d
index b10390f..218c13f 100644
--- a/ld/testsuite/ld-loongarch-elf/jmp_op.d
+++ b/ld/testsuite/ld-loongarch-elf/jmp_op.d
@@ -28,3 +28,4 @@
[ ]+48:[ ]+6bffb8a4[ ]+[ ]+bltu[ ]+\$a1, \$a0, -72\(0x3ffb8\)[ ]+# 0x0
[ ]+4c:[ ]+6fffb485[ ]+[ ]+bgeu[ ]+\$a0, \$a1, -76\(0x3ffb4\)[ ]+# 0x0
[ ]+50:[ ]+6fffb0a4[ ]+[ ]+bgeu[ ]+\$a1, \$a0, -80\(0x3ffb0\)[ ]+# 0x0
+[ ]+54:[ ]+4c000020[ ]+[ ]+jirl[ ]+\$zero, \$ra, 0
diff --git a/ld/testsuite/ld-loongarch-elf/jmp_op.s b/ld/testsuite/ld-loongarch-elf/jmp_op.s
index 1deb165..56f9867 100644
--- a/ld/testsuite/ld-loongarch-elf/jmp_op.s
+++ b/ld/testsuite/ld-loongarch-elf/jmp_op.s
@@ -20,3 +20,4 @@
bgtu $r4,$r5,.L1
bgeu $r4,$r5,.L1
bleu $r4,$r5,.L1
+ret
diff --git a/opcodes/loongarch-opc.c b/opcodes/loongarch-opc.c
index 35bae8c..1b51004 100644
--- a/opcodes/loongarch-opc.c
+++ b/opcodes/loongarch-opc.c
@@ -841,6 +841,7 @@
{ 0x0, 0x0, "bgtu", "r,r,la", "bltu %2,%1,%%b16(%3)", 0, 0, 0 },
{ 0x0, 0x0, "bleu", "r,r,la", "bgeu %2,%1,%%b16(%3)", 0, 0, 0 },
{ 0x0, 0x0, "jr", "r", "jirl $r0,%1,0", 0, 0, 0 },
+ { 0x0, 0x0, "ret", "", "jirl $r0,$r1,0", 0, 0, 0 },
{ 0 } /* Terminate the list. */
};
