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| author | Benedikt Huber <benedikt.huber@theobroma-systems.com> | 2015-11-06 17:10:17 +0000 |
|---|---|---|
| committer | Philipp Tomsich <ptomsich@gcc.gnu.org> | 2015-11-06 17:10:17 +0000 |
| commit | a6fc00da763fceeb9b7491fe07c6985949da9953 (patch) | |
| tree | b04b26d8aedd89ced8b4a670702d77564dd59a55 /gcc/doc | |
| parent | 7ad72a979bc0380cb05c036f008257fdcd54e77b (diff) | |
| download | gcc-a6fc00da763fceeb9b7491fe07c6985949da9953.zip gcc-a6fc00da763fceeb9b7491fe07c6985949da9953.tar.gz gcc-a6fc00da763fceeb9b7491fe07c6985949da9953.tar.bz2 | |
aarch64-builtins.c: Builtins for rsqrt and rsqrtf.
2015-11-06 Benedikt Huber <benedikt.huber@theobroma-systems.com>
Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
* config/aarch64/aarch64-builtins.c: Builtins for rsqrt and rsqrtf.
* config/aarch64/aarch64-protos.h: Declare.
* config/aarch64/aarch64-simd.md: Matching expressions for frsqrte and
frsqrts.
* config/aarch64/aarch64-tuning-flags.def: Added recip_sqrt.
* config/aarch64/aarch64.c: New functions. Emit rsqrt estimation code when
applicable.
* config/aarch64/aarch64.md: Added enum entries.
* config/aarch64/aarch64.opt: Added option -mlow-precision-recip-sqrt.
* testsuite/gcc.target/aarch64/rsqrt_asm_check_common.h: Common macros for
assembly checks.
* testsuite/gcc.target/aarch64/rsqrt_asm_check_negative_1.c: Make sure
frsqrts and frsqrte are not emitted.
* testsuite/gcc.target/aarch64/rsqrt_asm_check_1.c: Make sure frsqrts and
frsqrte are emitted.
* testsuite/gcc.target/aarch64/rsqrt_1.c: Functional tests for rsqrt.
Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Co-Authored-By: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
From-SVN: r229866
Diffstat (limited to 'gcc/doc')
| -rw-r--r-- | gcc/doc/invoke.texi | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 587e30e..79bea2f 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -521,6 +521,7 @@ Objective-C and Objective-C++ Dialects}. -mtls-size=@var{size} @gol -mfix-cortex-a53-835769 -mno-fix-cortex-a53-835769 @gol -mfix-cortex-a53-843419 -mno-fix-cortex-a53-843419 @gol +-mlow-precision-recip-sqrt -mno-low-precision-recip-sqrt@gol -march=@var{name} -mcpu=@var{name} -mtune=@var{name}} @emph{Adapteva Epiphany Options} @@ -12519,6 +12520,17 @@ Enable or disable the workaround for the ARM Cortex-A53 erratum number 843419. This erratum workaround is made at link time and this will only pass the corresponding flag to the linker. +@item -mlow-precision-recip-sqrt +@item -mno-low-precision-recip-sqrt +@opindex -mlow-precision-recip-sqrt +@opindex -mno-low-precision-recip-sqrt +The square root estimate uses two steps instead of three for double-precision, +and one step instead of two for single-precision. +Thus reducing latency and precision. +This is only relevant if @option{-ffast-math} activates +reciprocal square root estimate instructions. +Which in turn depends on the target processor. + @item -march=@var{name} @opindex march Specify the name of the target architecture, optionally suffixed by one or |