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| author | Michael Meissner <meissner@linux.vnet.ibm.com> | 2016-07-08 14:49:37 +0000 |
|---|---|---|
| committer | Michael Meissner <meissner@gcc.gnu.org> | 2016-07-08 14:49:37 +0000 |
| commit | cef4b65070a67ba1afa3359f21c48e4529ac154b (patch) | |
| tree | 96eebe6ef0657e6a060a3cd1606157920acef1a2 /gcc/doc | |
| parent | 3c3ecf52a6394009877a6771c871603c13fd035f (diff) | |
| download | gcc-cef4b65070a67ba1afa3359f21c48e4529ac154b.zip gcc-cef4b65070a67ba1afa3359f21c48e4529ac154b.tar.gz gcc-cef4b65070a67ba1afa3359f21c48e4529ac154b.tar.bz2 | |
re PR target/71806 (PowerPC -mcpu=power9 enables __float128 without an explicit -mfloat128)
[gcc]
2016-07-08 Michael Meissner <meissner@linux.vnet.ibm.com>
PR target/71806
* config/rs6000/rs6000-cpus.def (ISA_3_0_MASKS_SERVER): Do not
enable -mfloat128-hardware by default.
(ISA_3_0_MASKS_IEEE): New macro to give all of the VSX options
that IEEE 128-bit hardware support needs.
* config/rs6000/rs6000.c (rs6000_option_override_internal): If
-mcpu=power9 -mfloat128, enable -mfloat128-hardware by default.
Use ISA_3_0_MASKS_IEEE as the set of options that IEEE 128-bit
floating point requires.
* doc/invoke.texi (RS/6000 and PowerPC Options): Document
-mfloat128 and -mfloat128-hardware changes.
[gcc/testsuite]
2016-07-08 Michael Meissner <meissner@linux.vnet.ibm.com>
PR target/71806
* gcc.target/powerpc/p9-lxvx-stxvx-3.c: Add -mfloat128 option.
From-SVN: r238164
Diffstat (limited to 'gcc/doc')
| -rw-r--r-- | gcc/doc/invoke.texi | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index b6398ff..e185178 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -20355,9 +20355,14 @@ hardware instructions. The VSX instruction set (@option{-mvsx}, @option{-mcpu=power7}, or @option{-mcpu=power8}) must be enabled to use the @option{-mfloat128} -option. The @code{-mfloat128} option only works on PowerPC 64-bit +option. The @option{-mfloat128} option only works on PowerPC 64-bit Linux systems. +If you use the ISA 3.0 instruction set (@option{-mcpu=power9}), the +@option{-mfloat128} option will also enable the generation of ISA 3.0 +IEEE 128-bit floating point instructions. Otherwise, IEEE 128-bit +floating point will be done with software emulation. + @item -mfloat128-hardware @itemx -mno-float128-hardware @opindex mfloat128-hardware @@ -20365,6 +20370,13 @@ Linux systems. Enable/disable using ISA 3.0 hardware instructions to support the @var{__float128} data type. +If you use @option{-mfloat128-hardware}, it will enable the option +@option{-mfloat128} as well. + +If you select ISA 3.0 instructions with @option{-mcpu=power9}, but do +not use either @option{-mfloat128} or @option{-mfloat128-hardware}, +the IEEE 128-bit floating point support will not be enabled. + @item -mmodulo @itemx -mno-modulo @opindex mmodulo |