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C/C++

Showing 42

#pragma report should be extended to C

It is very frustrating that this pragma is not available in C, but only in C++!
almost 9 years ago in C/C++ and Fortran Compilers / C/C++ 4 Not under consideration

Perform optimizations based on __attribute__((__malloc__))

Currently, __attribute__((__malloc__)) does not work as documented in the compiler docs. The documentation infers that the compiler performs certain optimizations when using __malloc__ attribute. However, it appears that the compiler simply tolera...
almost 9 years ago in C/C++ and Fortran Compilers / C/C++ 4 Not under consideration

87671, 49R, 000 BGQ , xlc++ 12.1.0.7 -O2 slow , vulcan , John Gyllenhaal

-------- Forwarded Message --------Subject: RE: 87671, 49R, 000 BGQ , xlc++ 12.1.0.7 -O2 slow , vulcan , John GyllenhaalDate: Wed, 21 Jan 2015 14:54:40 -0500From: Viktor Ganich <vganich@ca.ibm.com>To: Paul Szepietowski <pauls@llnl.gov>...
over 9 years ago in C/C++ and Fortran Compilers / C/C++ 4 Not under consideration

Using CPACF with HW built-In instructions

ISV likes to use HW Crypto support of CPACF (see Principles of Operation) in their applications running on z/OS. As of requiremts of their architecture and as of performance reasons, they do not use ICSF. So they have to use the CPACF instructions...
over 9 years ago in C/C++ and Fortran Compilers / C/C++ 7 Not under consideration

Behaviour of comma operator in C++

We use multiple C and C++ compilers, including IBM XL C/C++ for AIX V11.1.0.18. XL C++ appears to treat comma expressions differently depending if they are an argument to a return statement or a function or if they are used elsewhere. This behavio...
over 9 years ago in C/C++ and Fortran Compilers / C/C++ 3 Not under consideration

Long compile time with -qsmp=omp for non-openmp files

XLC enforces -qhot optimization steps with -qsmp=omp option even for non-OMP source files, making the compile time unnecessarily long for such cases. The -qsmp=omp compile time issue becomes a dramatic problem because in user's makefile, the optio...
about 10 years ago in C/C++ and Fortran Compilers / C/C++ 6 Not under consideration

DB2 & CICS coprocessors do not provide enough debug information

To convert to co-processors we need to have the CICS and DB2 listings or something equivalent. We always print the first page of the DB2 and CICS pre-processor listingbecause they tell the applications the verson of DB2 the program was compiled us...
about 10 years ago in C/C++ and Fortran Compilers / C/C++ 4 Not under consideration

z/OS XL C/C++ allow GENASM and __asm without using METAL C

Separate GENASM and METAL C/C++ compiler options and allow calling of operating system services directly from a non-METAL C/C++ program using __asm language extension.
over 10 years ago in C/C++ and Fortran Compilers / C/C++ 3 Not under consideration

RFE for header file cache optimization on C compiler

We would like to see the following implemented with the C compiler frontend just like it is for the C++ compiler frontend beginning with Xlc 12.1: -qxflag=dircache[,m[,n]] where m and n are optional * m is a integral prime number between 2 and 71 ...
over 10 years ago in C/C++ and Fortran Compilers / C/C++ 5 Not under consideration

Provide some 64-bit compiler intrinsics when compiling 32-bit on a 64- bit architecture

The xlC compiler supplies (many) intrinsics that be used in lieu of assembly. Some of these intrinsic work on 32-bit words, and some on 64- bit double-words. (There are many others, but our interest here is 32- bit and 64-bit). __lwarx() load-word...
almost 11 years ago in C/C++ and Fortran Compilers / C/C++ 8 Not under consideration

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