https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77921
Bug ID: 77921
Summary: [7 Regression] tree-ssanames.c miscompiled during PGO
bootstrap
Product: gcc
Version: 7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: gcov-profile
Assignee: unassigned at gcc dot gnu.org
Reporter: trippels at gcc dot gnu.org
Target Milestone: ---
Created attachment 39783
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=39783&action=edit
unreduced testcase
% g++ -S -Wno-coverage-mismatch -c -O2 -fprofile-use tree-ssanames.ii
.section .text.unlikely
.cfi_startproc
.type _Z12release_defsP6gimple.cold.41, @function
_Z12release_defsP6gimple.cold.41:
.L138:
.cfi_def_cfa_offset 80
.cfi_offset 3, -56
.cfi_offset 6, -48
.cfi_offset 12, -40
.cfi_offset 13, -32
.cfi_offset 14, -24
.cfi_offset 15, -16
movl %r14d, %r12d
.L123:
movq 32(%rbx), %rbx
movzwl (%rbx), %ecx
jmp .L128
.L105:
movq stderr(%rip), %rdi
movq %rbx, %rsi
call _Z16verify_imm_linksP8_IO_FILEP9tree_node
jmp .L106
.L85:
movq 48(%rdi), %rbx
testq %rbx, %rbx
je .L80
movl $0, 4(%rsp)
movl $0, 8(%rsp)
movl $0, 12(%rsp)
jmp .L98
.L82:
movzbl 73(%rdi), %edx
movq 48(%rdi), %rbx
testq %rbx, %rbx
movl %edx, 4(%rsp)
je .L87
movl $0, 8(%rsp)
movl $2, 12(%rsp)
jmp .L98
.L133:
movl 8(%rsp), %edx
jmp .L89
.L137:
movl %r14d, 8(%rsp)
jmp .L121
.L180:
.L115:
jmp .L115
Also happens on ppc64le (although in a different function):
00000000108b5450 <_Z19release_ssa_name_fnP8functionP9tree_node>:
...
108b5690: 00 00 00 48 b 108b5690
<_Z19release_ssa_name_fnP8functionP9tree_node+0x240>
