https://sourceware.org/bugzilla/show_bug.cgi?id=34974
Bug ID: 34974
Summary: Error: invalid instruction suffix for movzww
(%rax),%ax
Product: binutils
Version: 2.46.1
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: gas
Assignee: unassigned at sourceware dot org
Reporter: romph at gmx dot net
Target Milestone: ---
Version: binutils 2.46-3ubuntu2 amd64
The asm(...) command in att syntax:
"movzww (%rax),%ax;"
generates the error
Error: invalid instruction suffix for `movzw'
The intel syntax version works without errors.
asm
(
".intel_syntax noprefix;"
"movzx ax,WORD PTR [rax];"
"movzx eax,WORD PTR [rax];"
"movzx rax,WORD PTR [rax];"
".att_syntax noprefix;"
// Error: invalid instruction suffix for `movzw'
//"movzww (%rax),%ax;"
"movzwl (%rax),%eax;"
"movzwq (%rax),%rax;"
);
The disassembler output (objdump -D) is OK:
0: 66 0f b7 00 movzww (%rax),%ax
4: 0f b7 00 movzwl (%rax),%eax
7: 48 0f b7 00 movzwq (%rax),%rax
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