** Package changed: linux (Ubuntu) => gcc-8 (Ubuntu)
** Also affects: ubuntu-z-systems
Importance: Undecided
Status: New
** Changed in: ubuntu-z-systems
Status: New => Triaged
** Changed in: ubuntu-z-systems
Importance: Undecided => High
** Changed in: ubuntu-z-systems
Assignee: (unassigned) => Matthias Klose (doko)
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https://bugs.launchpad.net/bugs/1837522
Title:
GCC Miscompilation of vector shift
Status in Ubuntu on IBM z Systems:
Triaged
Status in gcc-8 package in Ubuntu:
New
Bug description:
Vector shift miscompilation
---Steps to Reproduce---
t.c:
__vector int
foo (__vector int a, int s)
{
return a << (s + 3);
}
gcc -O3 -march=z13 t.c -S -mzvector
foo:
veslf %v24,%v24,0(%r2) <---- +3 is omitted
br %r14
Contact Information = [email protected]
Userspace tool common name: GCC
The userspace tool has the following bit modes: 64
Backported fix has been applied to GCC 8 branch as r273493:
https://gcc.gnu.org/viewcvs?rev=273493&root=gcc&view=rev
S/390: Fix vector shift count operand
We currently use subst definitions to handle the different variants of shift
count operands. Unfortunately, in the vector shift pattern the shift count
operand is used directly. Without it being adjusted for the 'subst' variants
the
displacement value is omitted resulting in a wrong shift count being applied.
This patch needs to be applied to older branches as well.
gcc/ChangeLog:
2019-07-15 Andreas Krebbel <[email protected]>
Backport from mainline
2019-07-01 Andreas Krebbel <[email protected]>
* config/s390/vector.md: Fix shift count operand printing.
gcc/testsuite/ChangeLog:
2019-07-15 Andreas Krebbel <[email protected]>
Backport from mainline
2019-07-01 Andreas Krebbel <[email protected]>
* gcc.target/s390/vector/vec-shift-2.c: New test.
Added:
branches/gcc-8-branch/gcc/testsuite/gcc.target/s390/vector/vec-shift-2.c
Modified:
branches/gcc-8-branch/gcc/ChangeLog
branches/gcc-8-branch/gcc/config/s390/vector.md
branches/gcc-8-branch/gcc/testsuite/ChangeLog
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