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| author | H.J. Lu <hongjiu.lu@intel.com> | 2009-02-18 02:16:03 +0000 |
|---|---|---|
| committer | H.J. Lu <hjl@gcc.gnu.org> | 2009-02-17 18:16:03 -0800 |
| commit | bce08d5003e0cb1f63cbe92895be8cbcc5c48547 (patch) | |
| tree | 69c176a033d12f090d8e12d52fe61b4ace95034f /gcc/doc | |
| parent | 5600f233ef5f740908f0480b76936e503b1d4cda (diff) | |
| download | gcc-bce08d5003e0cb1f63cbe92895be8cbcc5c48547.zip gcc-bce08d5003e0cb1f63cbe92895be8cbcc5c48547.tar.gz gcc-bce08d5003e0cb1f63cbe92895be8cbcc5c48547.tar.bz2 | |
re PR target/39082 (union with long double doesn't follow x86-64 psABI)
gcc/
2009-02-17 H.J. Lu <hongjiu.lu@intel.com>
PR target/39082
* c.opt (Wabi): Support C and ObjC.
(Wpsabi): New.
* c-opts.c (c_common_handle_option): Handle OPT_Wabi.
* config/i386/i386.c (classify_argument): Warn once about the ABI
change when passing union with long double.
* doc/invoke.texi: Update -Wabi for warning psABI changes.
gcc/testsuite/
2009-02-17 H.J. Lu <hongjiu.lu@intel.com>
PR target/39082
* g++.dg/compat/struct-layout-1_generate.c (dg_options): Add
-Wno-abi for x86.
* gcc.dg/compat/struct-layout-1_generate.c (dg_options): Likewise.
* gcc.target/i386/pr39082-1.c: New.
* gcc.target/x86_64/abi/abi-x86_64.exp (additional_flags): Add
-Wno-abi.
* gcc.target/x86_64/abi/args.h (XMM_T): Add _m64 and _m128 if
CHECK_M64_M128 is defined.
(check_f_arguments): Add "do".
(check_vector_arguments): New.
(check_m64_arguments): Likewise.
(check_m128_arguments): Likewise.
* gcc.target/x86_64/abi/defines.h: Include <xmmintrin.h>.
(CHECK_M64_M128): Define.
* gcc.target/x86_64/abi/test_m64m128_returning.c: New. Based
on abitest.
* gcc.target/x86_64/abi/test_passing_m64m128.c: Likewise.
* gcc.target/x86_64/abi/test_passing_structs.c: Define __m128
tests only if CHECK_M64_M128 is defined.
* gcc.target/x86_64/abi/test_passing_structs.c (m128_struct): New.
(m128_2_struct): Likewise.
(check_struct_passing5): Likewise.
(check_struct_passing6): Likewise.
(main): Test struct with __m128 if CHECK_M64_M128 is defined.
* gcc.target/x86_64/abi/test_passing_unions.c (un4): New.
(un5): Likewise.
(check_union_passing4): Likewise.
(main): Test union with __m128 if CHECK_M64_M128 is defined.
From-SVN: r144257
Diffstat (limited to 'gcc/doc')
| -rw-r--r-- | gcc/doc/invoke.texi | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 6d36794..f52b643 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -1966,7 +1966,7 @@ Do not assume @samp{inline} for functions defined inside a class scope. functions will have linkage like inline functions; they just won't be inlined by default. -@item -Wabi @r{(C++ and Objective-C++ only)} +@item -Wabi @r{(C, Objective-C, C++ and Objective-C++ only)} @opindex Wabi @opindex Wno-abi Warn when G++ generates code that is probably not compatible with the @@ -2066,6 +2066,27 @@ Instantiations of these templates may be mangled incorrectly. @end itemize +It also warns psABI related changes. The known psABI changes at this +point include: + +@itemize @bullet + +@item +For SYSV/x86-64, when passing union with long double, it is changed to +pass in memory as specified in psABI. For example: + +@smallexample +union U @{ + long double ld; + int i; +@}; +@end smallexample + +@noindent +@code{union U} will always be passed in memory. + +@end itemize + @item -Wctor-dtor-privacy @r{(C++ and Objective-C++ only)} @opindex Wctor-dtor-privacy @opindex Wno-ctor-dtor-privacy |