From: LIU Hao <lh_mouse@126.com>
Date: Sat, 25 Oct 2025 09:19:34 +0000 (+0800)
Subject: x86-64: Use `movsxd` to perform SI-to-DI extension in Intel syntax
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=66b38349273525dfb86f0f74d6c928abdbf7154f;p=thirdparty%2Fgcc.git

x86-64: Use `movsxd` to perform SI-to-DI extension in Intel syntax

Although there's no possibility of ambiguity, Intel manual says the mnemonic
for DWORD-to-QWORD sign-extension operation should be MOVSXD. Some assemblers
(GNU AS, NASM) also overload MOVSX, but some others don't accept MOVSX (LLVM,
MASM, YASM in NASM mode) and require MOVSXD.

This mnemonic was introduced in r0-34259-g123bf9e3f4056d in 2001, and has not
been updated ever since.

gcc/ChangeLog:

	PR target/119079
	* config/i386/i386.md: Use `movsxd` to perform SI-to-DI extension in Intel
	syntax.

Signed-off-by: LIU Hao <lh_mouse@126.com>
---

diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md
index 8a3e336bee6..218377a1770 100644
--- a/gcc/config/i386/i386.md
+++ b/gcc/config/i386/i386.md
@@ -4982,7 +4982,7 @@
   "TARGET_64BIT"
   "@
    {cltq|cdqe}
-   movs{lq|x}\t{%1, %0|%0, %1}"
+   movs{lq|xd}\t{%1, %0|%0, %1}"
   [(set_attr "type" "imovx")
    (set_attr "mode" "DI")
    (set_attr "prefix_0f" "0")
@@ -27859,7 +27859,7 @@
 {
   output_asm_insn ("mov{<imodesuffix>}\t{%3, %<k>1|%<k>1, %3}", operands);
   output_asm_insn ("mov{<imodesuffix>}\t{%<k>1, %0|%0, %<k>1}", operands);
-  return "movs{lq|x}\t{%2, %1|%1, %2}";
+  return "movs{lq|xd}\t{%2, %1|%1, %2}";
 }
   [(set_attr "type" "multi")
    (set_attr "length" "24")])