https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80884
Bug ID: 80884
Summary: [8 regression] test case
gcc.target/powerpc/20050830-1.c fails starting with
r247886
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: seurer at gcc dot gnu.org
Target Milestone: ---
This test fails on power6 (BE obviously) but still works on power7 and later.
The test case is looking for a specific assembler instruction
spawn -ignore SIGHUP /home/seurer/gcc/build/gcc-trunk-p6/gcc/xgcc
-B/home/seurer/gcc/build/gcc-trunk-p6/gcc/
/home/seurer/gcc/gcc-trunk-p6/gcc/testsuite/gcc.target/powerpc/20050830-1.c
-fno-diagnostics-show-caret -fdiagnostics-color=never -O2 -ffat-lto-objects -S
-o 20050830-1.s
PASS: gcc.target/powerpc/20050830-1.c (test for excess errors)
FAIL: gcc.target/powerpc/20050830-1.c scan-assembler bdn
and the assembler output changed like this from r247885 to r247886:
seurer@makalu-lp1:~/gcc/build/gcc-test$ diff 20050830-1.s.old 20050830-1.s.new
19,30c19,29
< addis 10,2,.LC0@toc@ha
< addi 9,3,-512
< rldicl 9,9,56,40
< addi 9,9,1
< ld 8,.LC0@toc@l(10)
< addi 10,3,-256
< sldi 3,3,2
< cmpwi 7,10,256
< mtctr 9
< add 3,3,8
< li 9,42
< blt 7,.L7
---
> addis 9,2,.LC0@toc@ha
> addi 10,3,-512
> rlwinm 10,10,0,0,23
> subf 10,10,3
> ld 8,.LC0@toc@l(9)
> sldi 10,10,2
> sldi 9,3,2
> addi 7,8,-1024
> add 9,9,8
> add 10,10,7
> li 8,42
33,35c32,35
< stw 9,0(3)
< addi 3,3,-1024
< bdnz .L3
---
> stw 8,0(9)
> addi 9,9,-1024
> cmpld 7,9,10
> bne 7,.L3
38,41d37
< .L7:
< li 10,1
< mtctr 10
< b .L3
45c41
< .ident "GCC: (GNU) 8.0.0 20170511 (experimental) [trunk revision
247885]"
---
> .ident "GCC: (GNU) 8.0.0 20170511 (experimental) [trunk revision
> 247886]"
When I tried it with a compiler built for power7 there was no difference is the
assembly before/after this revision.
