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C/C++

Showing 42 of 8226

Enhance compiler optimizer

The compiler should generate more efficient code for testing bitfields when the bits tested are located in the same byte.
over 6 years ago in C/C++ and Fortran Compilers / C/C++ 3 Not under consideration

inline ASM DS incorrect load for long long

With inline ASM to initialize a long long variable using an ASM DS instruction in 31-bit mode, the compiler is only generating an 'L' instruction, which does not load the full 64-bit register representing the long long variable: unsigned long long...
over 6 years ago in C/C++ and Fortran Compilers / C/C++ 3 Not under consideration

Insufficient inlining for function pointers

The compiler is currently unable to inline a function that is passed to another function as a function pointer parameter. As a result trivial functions may not be inlined when called using a function pointers.
over 6 years ago in C/C++ and Fortran Compilers / C/C++ 3 Planned for future release

Reliable indicator of AMODE in F7SA chain

When using Metal C, calling an ASCmode=AR function creates an ambiguous F7SA save area (in the DSA chain). The AMODE is switched BEFORE the call (BASR) is executed, and restored AFTER the return, so the AMODE of the caller (and therefore the DSAUS...
over 6 years ago in C/C++ and Fortran Compilers / C/C++ 2 Not under consideration

Document and support #pragma once in both C/C++

The z/OS C++ compiler supports the #pragma once directive. This is undocumented and not supported for the C language. This feature should be documented and supported for both the C and C++ languages.
almost 7 years ago in C/C++ and Fortran Compilers / C/C++ 2 Not under consideration

Exception Object Enhance

Exception handle is an important mechanism to help programmers debug their programs. Many of the literature books mention the use of this mechanism to increase the quality of the application. Although C11/C14 has no longer recommend the use of the...
about 7 years ago in C/C++ and Fortran Compilers / C/C++ 3 Not under consideration

#line directive causing source to not be intermixed in ASM listing

Sometimes C source code is embedded within generated pseudo assembly listings via the LIST option, like: 00012E 50D0 E004 000008 | ST r13,4(,r14)000132 18DE 000008 | LR r13,r14000134 End of Prolog 000009 | * { 000010 | * return foo();000134 58F0 3...
over 7 years ago in C/C++ and Fortran Compilers / C/C++ 3 Not under consideration

Add support to EDCDSECT for generating Doxygen-compatible comments

We have a product that has many data areas in common between C/C++ code and Assembler code. We generate the C/C++ header files from the Assembler DSECTs using the EDCDSECT utility provided by z/OS XL C/C++. We generate documentation for the C/C++ ...
almost 8 years ago in C/C++ and Fortran Compilers / C/C++ 21 Planned for future release

XL C/C++ compiler setting to disallow vector (VMX/VSX) instructions

Request for the compiler to support code generation consistent with an AIX tuning of allow_vmx=0. The AIX tuning rejects all vector instructions, treating them as illegal operations. The compiler should have a corresponding option to completely di...
almost 8 years ago in C/C++ and Fortran Compilers / C/C++ 2 Future consideration

Raise a severe error if an unknown instruction is generated

If the Compiler/Optimizer generates an invalid unknown instruction (UNKWN), it have to raise a Severe Error. The assembly list shows unknown ?UNKWN? instructions: 000027 | ALRK r8,r7,r9 000027 | UNKWN r15,r3 000027 | UNKWN r8,r6 000027 | C r0,s.uw...
about 8 years ago in C/C++ and Fortran Compilers / C/C++ 7 Not under consideration

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