http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47008
Summary: [4.6 Regression] gfortran.dg/extends_2.f03 FAIL with
-Os -fschedule-insns
Product: gcc
Version: 4.6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rtl-optimization
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: zso...@seznam.cz
Host: x86_64-pc-linux-gnu
Target: x86_64-pc-linux-gnu
Created attachment 22814
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=22814
reduced testcase
Output:
$ gfortran -Os -fno-asynchronous-unwind-tables
-fno-inline-functions-called-once -fschedule-insns testcase.f03
$ ./a.out
Aborted
$ gfortran -Os -fno-asynchronous-unwind-tables
-fno-inline-functions-called-once -fschedule-insns extends_2.f03
$ ./a.out
Aborted
$ gfortran -Os -fno-asynchronous-unwind-tables
-fno-inline-functions-called-once -fschedule-insns -fsched-pressure
extends_3.f03
$ ./a.out
Aborted
For testcase.f03, in the assembly, the problem is there:
# store 123455 to [rsp+8], &supervisor == rsp+8
mov DWORD PTR [rsp+8], 123455 # person.1.ss,
lea rsi, [rsp+8] # tmp64,
# rsp -= 8 (parameter for entry() ?)
push 0 #
# &supervisor == rsp+8+8 == rsp+16
mov eax, 538976288 # tmp67,
# loads old value of &supervisor(+4)
lea rdx, [rsp+12] # tmp65,
lea rbx, [rsp+56] # tmp72,
mov rdi, rdx # tmp66, tmp65
mov edx, OFFSET FLAT:.LC3 #,
# starts storing 4 bytes under previously used &supervisor, overwrites 123455
rep stosd
Tested revisions (for reduced testcase):
r168026 - fail
r165699 - OK
4.5 r166509 - OK
