From 66b38349273525dfb86f0f74d6c928abdbf7154f Mon Sep 17 00:00:00 2001 From: LIU Hao Date: Sat, 25 Oct 2025 17:19:34 +0800 Subject: [PATCH] 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 --- gcc/config/i386/i386.md | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) 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{}\t{%3, %1|%1, %3}", operands); output_asm_insn ("mov{}\t{%1, %0|%0, %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")]) -- 2.47.3