diff options
Diffstat (limited to 'docs/LangRef.html')
| -rw-r--r-- | docs/LangRef.html | 19 |
1 files changed, 11 insertions, 8 deletions
diff --git a/docs/LangRef.html b/docs/LangRef.html index c1482115a6..3a474a554d 100644 --- a/docs/LangRef.html +++ b/docs/LangRef.html @@ -3006,10 +3006,12 @@ call void @llvm.dbg.value(metadata !24, i64 0, metadata !25) <div> <p><tt>fpmath</tt> metadata may be attached to any instruction of floating point - type. It can be used to express the maximum acceptable relative error in the - result of that instruction, in ULPs, thus potentially allowing the compiler - to use a more efficient but less accurate method of computing it. - ULP is defined as follows:</p> + type. It can be used to express the maximum acceptable error in the result of + that instruction, in ULPs, thus potentially allowing the compiler to use a + more efficient but less accurate method of computing it. The number of ULPs + may also be the string <tt>"fast"</tt>, which tells the compiler that speed + matters more than accuracy, so any fairly accurate method of computation is + fine as long as it is quick. ULP is defined as follows:</p> <blockquote> @@ -3021,13 +3023,14 @@ call void @llvm.dbg.value(metadata !24, i64 0, metadata !25) </blockquote> -<p>The metadata node shall consist of a single non-negative floating - point number representing the maximum relative error. For example, - 2.5 ULP:</p> +<p>The metadata node shall consist of a single positive floating point number + representing the maximum relative error, or the string <tt>"fast"</tt>. + For example:</p> <div class="doc_code"> <pre> -!0 = metadata !{ float 2.5 } +!0 = metadata !{ float 2.5 } ; maximum acceptable inaccuracy is 2.5 ULPs +!1 = metadata !{ !metadata !"fast" } ; potentially unbounded inaccuracy </pre> </div> |