On Thu, Oct 21, 2021 at 5:07 PM Martin Sebor via Gcc <gcc@gcc.gnu.org> wrote: > > I put #pragma GCC optimize "0" at the top of gimplify.c to help > me debug something in a bootstrapped compiler. The file failed > to compile with many assembler errors like this: > > /tmp/ccL9zcXD.s: Assembler messages: > /tmp/ccL9zcXD.s:9: Error: CFI instruction used without previous > .cfi_startproc > > I've done this before and had no problems. Is this supposed to > work or was I just lucky when it did before?
I see that dwarf2out_do_cfi_asm is sticky, once true or false, it will always return true or false. So it might be an issue there. Thanks, Andrew Pinski > > Thanks > Martin > > PS The top of gimplify.s is below (this is with no other code > changes to any files except the #pragma). > > .file "gimplify.c" > .text > .local _ZZ20gimplify_va_arg_exprPP9tree_nodePP6gimpleS4_E9gave_help > .comm > _ZZ20gimplify_va_arg_exprPP9tree_nodePP6gimpleS4_E9gave_help,1,1 > .p2align 4 > .type _ZL19handled_component_pPK9tree_node, @function > _ZL19handled_component_pPK9tree_node: > pushq %rbp > .cfi_def_cfa_offset 16 > .cfi_offset 6, -16 > movq %rsp, %rbp > .cfi_def_cfa_register 6 > movq %rdi, -8(%rbp) > movq -8(%rbp), %rax > movzwl (%rax), %eax > movzwl %ax, %eax > subl $47, %eax > cmpl $6, %eax > ja .L2 > movl $1, %eax > jmp .L3 > .L2: > movl $0, %eax > .L3: > popq %rbp > .cfi_def_cfa 7, 8 > ret
