https://sourceware.org/bugzilla/show_bug.cgi?id=24263
Bug ID: 24263
Summary: Missing 0x67 prefix for VSIB address without base
register
Product: binutils
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: gas
Assignee: unassigned at sourceware dot org
Reporter: hjl.tools at gmail dot com
Target Milestone: ---
Target: x32
[hjl@gnu-4 x32]$ make AS=as
as --x32 -o x.o x.s
objdump -dw x.o
x.o: file format elf32-x86-64
Disassembly of section .text:
00000000 <.text>:
0: c4 22 1d 92 1c 3d 0c 00 00 00 vgatherdps %ymm12,0xc(,%ymm15,1),%ymm11
[hjl@gnu-4 x32]$
Since VSIB index is sign-extended, without base register, 0xc(,%ymm15,1)
will point to the wrong address if there is no 0x67 address size prefix.
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