https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85525
Bug ID: 85525
Summary: Alignment Issue in AVX compiler intrinsics
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: tom at ritter dot vg
CC: jacek at codeweavers dot com
Target Milestone: ---
I am using gcc 6.4.0 and MinGW to compile some code that uses AVX intrinsics
for Windows. Specifically, this code:
https://searchfox.org/mozilla-central/rev/36dec78aecc40539ecc8d78e91612e38810f963c/gfx/skia/skia/src/opts/SkOpts_hsw.cpp
The crashing instruction is:
vmovdqa ymmword ptr [rbp-10h],ymm0
However at this location, rbp is 0 % 0x20 and vmovdqa expects 0x20 alignment
(and in the assembly offset by 0x10).
We think there is a missing alignment sequence at the beginning the function
(there is one for rbx, but not rbp).
The full disassembly and details are at https://pastebin.mozilla.org/9083932
