https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69596
Bug ID: 69596
Summary: vzeroupper is generated in interrupt handler
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: hjl.tools at gmail dot com
CC: vaalfreja at gmail dot com
Target Milestone: ---
[hjl@gnu-6 gcc]$ cat x.i
void
__attribute__((interrupt))
fn (void *frame)
{
asm ("#"
:
:
: "xmm3");
}
[hjl@gnu-6 gcc]$ ./xgcc -B./ -S -O2 -mno-avx512f -mno-iamcu -mavx x.i
[hjl@gnu-6 gcc]$ cat x.s
.file "x.i"
.text
.p2align 4,,15
.globl fn
.type fn, @function
fn:
.LFB0:
.cfi_startproc
vmovups %ymm3, -32(%rsp)
.cfi_offset 20, -40
#APP
# 5 "x.i" 1
#
# 0 "" 2
#NO_APP
vzeroupper <<<<<<<<<<<<< This isn't necessary
vmovups -32(%rsp), %ymm3
iretq
.cfi_endproc
.LFE0:
.size fn, .-fn
.ident "GCC: (GNU) 6.0.0 20160131 (experimental)"
.section .note.GNU-stack,"",@progbits
[hjl@gnu-6 gcc]$
