diff options
| author | Cameron Zwarich <zwarich@apple.com> | 2011-07-08 21:39:21 +0000 |
|---|---|---|
| committer | Cameron Zwarich <zwarich@apple.com> | 2011-07-08 21:39:21 +0000 |
| commit | 33390848a7eca75301d04a59b89b516d83e19ee0 (patch) | |
| tree | 78f81419440b86ae4fa8a150780b7f211668b781 /docs/LangRef.html | |
| parent | cc0ddc707d5a7b1dd11141881df0bf4210f8aeee (diff) | |
| download | external_llvm-33390848a7eca75301d04a59b89b516d83e19ee0.zip external_llvm-33390848a7eca75301d04a59b89b516d83e19ee0.tar.gz external_llvm-33390848a7eca75301d04a59b89b516d83e19ee0.tar.bz2 | |
Add an intrinsic and codegen support for fused multiply-accumulate. The intent
is to use this for architectures that have a native FMA instruction.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134742 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'docs/LangRef.html')
| -rw-r--r-- | docs/LangRef.html | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/docs/LangRef.html b/docs/LangRef.html index bc72144..3201731 100644 --- a/docs/LangRef.html +++ b/docs/LangRef.html @@ -241,6 +241,7 @@ <li><a href="#int_pow">'<tt>llvm.pow.*</tt>' Intrinsic</a></li> <li><a href="#int_exp">'<tt>llvm.exp.*</tt>' Intrinsic</a></li> <li><a href="#int_log">'<tt>llvm.log.*</tt>' Intrinsic</a></li> + <li><a href="#int_fma">'<tt>llvm.fma.*</tt>' Intrinsic</a></li> </ol> </li> <li><a href="#int_manip">Bit Manipulation Intrinsics</a> @@ -6570,6 +6571,37 @@ LLVM</a>.</p> <p>This function returns the same values as the libm <tt>log</tt> functions would, and handles error conditions in the same way.</p> +<h4> + <a name="int_fma">'<tt>llvm.fma.*</tt>' Intrinsic</a> +</h4> + +<div> + +<h5>Syntax:</h5> +<p>This is an overloaded intrinsic. You can use <tt>llvm.fma</tt> on any + floating point or vector of floating point type. Not all targets support all + types however.</p> + +<pre> + declare float @llvm.fma.f32(float %a, float %b, float %c) + declare double @llvm.fma.f64(double %a, double %b, double %c) + declare x86_fp80 @llvm.fma.f80(x86_fp80 %a, x86_fp80 %b, x86_fp80 %c) + declare fp128 @llvm.fma.f128(fp128 %a, fp128 %b, fp128 %c) + declare ppc_fp128 @llvm.fma.ppcf128(ppc_fp128 %a, ppc_fp128 %b, ppc_fp128 %c) +</pre> + +<h5>Overview:</h5> +<p>The '<tt>llvm.fma.*</tt>' intrinsics perform the fused multiply-accumulate + operation.</p> + +<h5>Arguments:</h5> +<p>The argument and return value are floating point numbers of the same + type.</p> + +<h5>Semantics:</h5> +<p>This function returns the same values as the libm <tt>fma</tt> functions + would.</p> + </div> <!-- ======================================================================= --> |