https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67630
Bug ID: 67630 Summary: ymm and zmm register aren't preserved in interrupt handler Product: gcc Version: 6.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: other Assignee: unassigned at gcc dot gnu.org Reporter: hjl.tools at gmail dot com CC: julia.koval at intel dot com Target Milestone: --- [hjl@gnu-6 interrupt-5]$ make clean rm -f *.o *.so *.s *.i.* *.x.* [hjl@gnu-6 interrupt-5]$ cat ymm.i void __attribute__((interrupt)) fn1 (void) { asm ("#" : : : "ymm0"); } [hjl@gnu-6 interrupt-5]$ make ymm.s /export/build/gnu/gcc/build-x86_64-linux/gcc/xgcc -B/export/build/gnu/gcc/build-x86_64-linux/gcc/ -O2 -mavx -S -o ymm.s ymm.i [hjl@gnu-6 interrupt-5]$ cat ymm.s .file "ymm.i" .section .text.unlikely,"ax",@progbits .LCOLDB0: .text .LHOTB0: .p2align 4,,15 .globl fn1 .type fn1, @function fn1: .LFB0: .cfi_startproc subq $24, %rsp .cfi_def_cfa_offset 32 vmovaps %xmm0, (%rsp) .cfi_offset 17, -32 #APP # 5 "ymm.i" 1 # # 0 "" 2 #NO_APP vzeroupper vmovaps (%rsp), %xmm0 addq $24, %rsp .cfi_def_cfa_offset 8 iret .cfi_endproc .LFE0: .size fn1, .-fn1 .section .text.unlikely .LCOLDE0: .text .LHOTE0: .ident "GCC: (GNU) 6.0.0 20150917 (experimental)" .section .note.GNU-stack,"",@progbits [hjl@gnu-6 interrupt-5]$