* [PATCH] [i386] Remove storage only description for _Float16 w/o avx512fp16.
@ 2021-09-25 2:39 liuhongt
2021-09-25 16:34 ` Jeff Law
0 siblings, 1 reply; 2+ messages in thread
From: liuhongt @ 2021-09-25 2:39 UTC (permalink / raw)
To: gcc-patches
[1] https://gcc.gnu.org/pipermail/gcc-patches/2021-September/580207.html
gcc/ChangeLog:
* doc/extend.texi (Half-Precision): Remove storage only
description for _Float16 w/o avx512fp16.
---
gcc/doc/extend.texi | 11 +++++------
1 file changed, 5 insertions(+), 6 deletions(-)
diff --git a/gcc/doc/extend.texi b/gcc/doc/extend.texi
index 9501a60f20e..79fa1bd4bf8 100644
--- a/gcc/doc/extend.texi
+++ b/gcc/doc/extend.texi
@@ -1156,12 +1156,11 @@ It is recommended that portable code use the @code{_Float16} type defined
by ISO/IEC TS 18661-3:2015. @xref{Floating Types}.
On x86 targets with SSE2 enabled, without @option{-mavx512fp16},
-@code{_Float16} type is storage only, all operations will be emulated by
-software emulation and the @code{float} instructions. The default behavior
-for @code{FLT_EVAL_METHOD} is to keep the intermediate result of the operation
-as 32-bit precision. This may lead to inconsistent behavior between software
-emulation and AVX512-FP16 instructions. Using @option{-fexcess-precision=16}
-will force round back after each operation.
+all operations will be emulated by software emulation and the @code{float}
+instructions. The default behavior for @code{FLT_EVAL_METHOD} is to keep the
+intermediate result of the operation as 32-bit precision. This may lead to
+inconsistent behavior between software emulation and AVX512-FP16 instructions.
+Using @option{-fexcess-precision=16} will force round back after each operation.
Using @option{-mavx512fp16} will generate AVX512-FP16 instructions instead of
software emulation. The default behavior of @code{FLT_EVAL_METHOD} is to round
--
2.27.0
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [PATCH] [i386] Remove storage only description for _Float16 w/o avx512fp16.
2021-09-25 2:39 [PATCH] [i386] Remove storage only description for _Float16 w/o avx512fp16 liuhongt
@ 2021-09-25 16:34 ` Jeff Law
0 siblings, 0 replies; 2+ messages in thread
From: Jeff Law @ 2021-09-25 16:34 UTC (permalink / raw)
To: liuhongt, gcc-patches
On 9/24/2021 8:39 PM, liuhongt via Gcc-patches wrote:
> [1] https://gcc.gnu.org/pipermail/gcc-patches/2021-September/580207.html
>
> gcc/ChangeLog:
>
> * doc/extend.texi (Half-Precision): Remove storage only
> description for _Float16 w/o avx512fp16.
OK
jeff
^ permalink raw reply [flat|nested] 2+ messages in thread
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