Fixes are available
June 2011 Update for XL C/C++ for Linux, V10.1
XL C/C++ for Linux Fix Pack 8 (January 2014 Update) for 10.1
August 2010 Update for XL C/C++ for Linux, V10.1
January 2011 Update for XL C/C++ for Linux, V10.1
January 2012 Update for XL C/C++ for Linux, V10.1
July 2012 Update for XL C/C++ for Linux, V10.1
APAR status
Closed as program error.
Error description
The following test case results in an incorrect output at runtime when compiled as follows: Compile Line: ppuxlc -qaltivec -o test test.c TestCase: #include <stdio.h> #include <altivec.h> main() { static vector float v[2] = { { 0.1f, 0.2f, 0.3f, 0.4f }, { 0.9f, 0.8f, 0.7f, 0.6f } }; vector float r; union { vector float v; float f[4]; } u; r = (vector float) vec_splat_u32(0); r = vec_add(r, v[0]); r = vec_add(r, v[1]); u.v = r; printf ("%f %f %f %f\n", u.f[0], u.f[1], u.f[2], u.f[3]); } ACTUAL OUTPUT: $./test "0.400000 0.100000 0.200000 0.300000" EXPECTED OUTPUT: $./test "1.000000 1.000000 1.000000 1.000000"
Local fix
The result is correct when the array is declared as "auto".
Problem summary
USER AFFECTED: Users that have the static vector array declared in the function scope and initialized with the vector compound literal are affected by this issue. PROBLEM DESCRIPTION: The compiler generated incorrect code to initialize the static vector array declared in the function scope and initialized with the vector compound literal.
Problem conclusion
The compiler has been fixed to generate correct code to initialize the array.
Temporary fix
Comments
APAR Information
APAR number
LI75584
Reported component name
XL C/C++ SLES10
Reported component ID
5724U8300
Reported release
A10
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2010-07-28
Closed date
2010-07-28
Last modified date
2010-07-28
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Fix information
Fixed component name
XL C/C++ SLES10
Fixed component ID
5724U8300
Applicable component levels
RA10 PSN LI74997
UP06/09/13
[{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SSJT9L","label":"XL C\/C++"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"A.1","Line of Business":{"code":"LOB08","label":"Cognitive Systems"}}]
Document Information
Modified date:
17 October 2021