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Bug 1546728

Summary: Build of qemu-kvm fails on ppc64 due to internal compiler error
Product: Red Hat Enterprise Linux 7 Reporter: Miroslav Rezanina <mrezanin>
Component: gccAssignee: Marek Polacek <mpolacek>
Status: CLOSED ERRATA QA Contact: Michael Petlan <mpetlan>
Severity: high Docs Contact: Vladimír Slávik <vslavik>
Priority: unspecified    
Version: 7.5CC: bugproxy, ddepaula, famz, hannsj_uhl, jakub, jen, lvivier, mcermak, mpolacek, mrezanin, muriloo, ohudlick, vslavik
Target Milestone: rc   
Target Release: 7.6   
Hardware: powerpc   
OS: Linux   
Whiteboard:
Fixed In Version: gcc-4.8.5-30.el7 Doc Type: Bug Fix
Doc Text:
Previously, GCC could crash on the PowerPC 64-bit architecture when trying to convert a vector shift-by-scalar into a shift-by-vector, because it used the wrong machine mode for the shift amount. This bug has been fixed and the shift amount now has the correct mode, so the conversion works and the code compiles without crashing.
 Story Points: ---
Clone Of: Environment:
Last Closed: 2018-10-30 07:27:17 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 1505884, 1507957, 1513404, 1528344    
Attachments:
Description Flags
preprocessed source causing error.
none
tcg-runtime-gvec.i none

Description Miroslav Rezanina 2018-02-19 12:50:16 UTC 
Description of problem:

When building latest upstream QEMU on ppc64le architecture build fails with following error:


/root/weekly/qemu-kvm/accel/tcg/tcg-runtime-gvec.c: In function ‘helper_gvec_shl8i’:
/root/weekly/qemu-kvm/accel/tcg/tcg-runtime-gvec.c:558:26: internal compiler error: in emit_move_insn, at expr.c:3495
         *(vec8 *)(d + i) = (*(vec8 *)(a + i) << shift);

Preprocessed source attached.
Comment 2 Jeff Nelson 2018-02-19 23:10:50 UTC 
Can you provide the attachment?
Comment 3 Miroslav Rezanina 2018-02-20 04:13:51 UTC 
Created attachment 1398070 [details]
preprocessed source causing error.
Comment 4 Miroslav Rezanina 2018-02-20 04:14:46 UTC 
Sorry, not sure why wasn't attachment added (added in form for new bug).
Comment 5 Marek Polacek 2018-02-20 14:27:54 UTC 
I'll see if I can bisect it but I'm afraid it's too late for 7.5.
Comment 6 Marek Polacek 2018-02-20 16:26:27 UTC 
Fixed by http://gcc.gnu.org/r227444.   Seems backportable.
Comment 8 Laurent Vivier 2018-03-29 06:59:01 UTC 
Reproducer:

-- r.c -----8<--------------------------------------------------
typedef unsigned char U1 __attribute__((vector_size(16)));
typedef unsigned short U2 __attribute__((vector_size(16)));
typedef unsigned int U4 __attribute__((vector_size(16)));
typedef unsigned long long U8 __attribute__((vector_size(16)));
void helper(void *d, void *a, int shift, int i);
void helper(void *d, void *a, int shift, int i)
{
  *(U1 *)(d + i) = *(U1 *)(a + i) << shift;
  *(U2 *)(d + i) = *(U2 *)(a + i) << shift;
  *(U4 *)(d + i) = *(U4 *)(a + i) << shift;
  *(U8 *)(d + i) = *(U8 *)(a + i) << shift;
}
-- r.c -----8<--------------------------------------------------

$ cc -c -o r.o r.c
r.c: In function ‘helper’:
r.c:8:35: internal compiler error: in emit_move_insn, at expr.c:3495
   *(U1 *)(d + i) = *(U1 *)(a + i) << shift;
                                   ^
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://bugzilla.redhat.com/bugzilla> for instructions.
Preprocessed source stored into /tmp/ccpJ2XXm.out file, please attach this to your bugreport.
Comment 12 Matt Newsome 2018-04-16 20:47:26 UTC 
*** Bug 1565536 has been marked as a duplicate of this bug. ***
Comment 13 IBM Bug Proxy 2018-04-17 06:52:11 UTC 
Created attachment 1422920 [details]
tcg-runtime-gvec.i
Comment 15 Michael Petlan 2018-07-16 17:21:09 UTC 
Reproduced successfully with gcc-4.8.5-28.el7_5.1 on both ppc64 and ppc64le; works OK with gcc-4.8.5-36.el7.

VERIFIED
Comment 17 errata-xmlrpc 2018-10-30 07:27:17 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2018:3016