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| author | David Edelsohn <edelsohn@gnu.org> | 2006-02-07 18:36:23 +0000 |
|---|---|---|
| committer | David Edelsohn <dje@gcc.gnu.org> | 2006-02-07 13:36:23 -0500 |
| commit | 8fbe3bb2efdc6803b1509acd7224259cef455e52 (patch) | |
| tree | 72aa019abc73ade5fd3b5471b8007310ec10bd09 /gcc/doc | |
| parent | 2090d6a0a845c58a3c5ed6c4260db5c178ec5511 (diff) | |
| download | gcc-8fbe3bb2efdc6803b1509acd7224259cef455e52.zip gcc-8fbe3bb2efdc6803b1509acd7224259cef455e52.tar.gz gcc-8fbe3bb2efdc6803b1509acd7224259cef455e52.tar.bz2 | |
invoke.texi (xl-compat): Document conversion and support routine names.
* doc/invoke.texi (xl-compat): Document conversion and support
routine names.
From-SVN: r110706
Diffstat (limited to 'gcc/doc')
| -rw-r--r-- | gcc/doc/invoke.texi | 16 |
1 files changed, 9 insertions, 7 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 0842675..f9b65f8 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -11247,20 +11247,22 @@ implies @option{-mno-powerpc64}. GCC defaults to @option{-maix32}. @itemx -mno-xl-compat @opindex mxl-compat @opindex mno-xl-compat -Produce code that conforms more closely to IBM XLC semantics when using -AIX-compatible ABI. Pass floating-point arguments to prototyped -functions beyond the register save area (RSA) on the stack in addition -to argument FPRs. Do not assume that most significant double in 128 -bit long double value is properly rounded when comparing values. +Produce code that conforms more closely to IBM XL compiler semantics +when using AIX-compatible ABI. Pass floating-point arguments to +prototyped functions beyond the register save area (RSA) on the stack +in addition to argument FPRs. Do not assume that most significant +double in 128-bit long double value is properly rounded when comparing +values and converting to double. Use XL symbol names for long double +support routines. The AIX calling convention was extended but not initially documented to handle an obscure K&R C case of calling a function that takes the -address of its arguments with fewer arguments than declared. AIX XL +address of its arguments with fewer arguments than declared. IBM XL compilers access floating point arguments which do not fit in the RSA from the stack when a subroutine is compiled without optimization. Because always storing floating-point arguments on the stack is inefficient and rarely needed, this option is not enabled by -default and only is necessary when calling subroutines compiled by AIX +default and only is necessary when calling subroutines compiled by IBM XL compilers without optimization. @item -mpe |