https://sourceware.org/bugzilla/show_bug.cgi?id=16490
Bug ID: 16490
Summary: Disp8 encoding/decoding is wrong AVX512 gather/scatter
insns
Product: binutils
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: binutils
Assignee: unassigned at sourceware dot org
Reporter: michael.v.zolotukhin at gmail dot com
Disp8 encoding/decoding is wrong for the following example (supposedly,
encoding is correct, decoding is incorrect):
.intel_syntax noprefix
vgatherqps ymm1{k1}, [eax+zmm0+4]
vpgatherqd ymm1{k1}, [eax+zmm0+4]
vpscatterqd [eax+zmm0+4]{k1}, ymm0
vscatterqps [eax+zmm0+4]{k1}, ymm0
After as d.s && objdump -dw:
Disassembly of section .text:
0000000000000000 <.text>:
0: 67 62 f2 7d 49 93 4c 00 01 vgatherqps 0x8(%eax,%zmm0,1),%ymm1{%k1}
9: 67 62 f2 7d 49 91 4c 00 01 vpgatherqd 0x8(%eax,%zmm0,1),%ymm1{%k1}
12: 67 62 f2 7d 49 a1 44 00 01 vpscatterqd
%ymm0,0x8(%eax,%zmm0,1){%k1}
1b: 67 62 f2 7d 49 a3 44 00 01 vscatterqps
%ymm0,0x8(%eax,%zmm0,1){%k1}
Note that the disp is 8, while the original disp is 4.
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