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The documentation is still rather terse because it needs to fit
onto a single line of clang --help output.
But at least it lists what the user can specify and documents the
non-obvious syntax.
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D149456
Files:
clang/include/clang/Driver/Options.td
Index: clang/include/clang/Driver/Options.td
===================================================================
--- clang/include/clang/Driver/Options.td
+++ clang/include/clang/Driver/Options.td
@@ -3957,8 +3957,12 @@
def mno_implicit_float : Flag<["-"], "mno-implicit-float">, Group<m_Group>,
HelpText<"Don't generate implicit floating point or vector instructions">;
def mimplicit_float : Flag<["-"], "mimplicit-float">, Group<m_Group>;
-def mrecip : Flag<["-"], "mrecip">, Group<m_Group>;
+def mrecip : Flag<["-"], "mrecip">, Group<m_Group>,
+ HelpText<"Equivalent to '-mrecip=all'">;
def mrecip_EQ : CommaJoined<["-"], "mrecip=">, Group<m_Group>,
Flags<[CC1Option]>,
+ HelpText<"Control use of approximate reciprocal and reciprocal square root
instructions followed by <n> iterations of "
+ "Newton-Raphson refinement. "
+ "<value> = ( ['!'] ['vec-'] ('rcp'|'sqrt') [('h'|'s'|'d')] [':'<n>]
) | 'all' | 'default' | 'none'">,
MarshallingInfoStringVector<CodeGenOpts<"Reciprocals">>;
def mprefer_vector_width_EQ : Joined<["-"], "mprefer-vector-width=">,
Group<m_Group>, Flags<[CC1Option]>,
HelpText<"Specifies preferred vector width for auto-vectorization. Defaults
to 'none' which allows target specific decisions.">,
Index: clang/include/clang/Driver/Options.td
===================================================================
--- clang/include/clang/Driver/Options.td
+++ clang/include/clang/Driver/Options.td
@@ -3957,8 +3957,12 @@
def mno_implicit_float : Flag<["-"], "mno-implicit-float">, Group<m_Group>,
HelpText<"Don't generate implicit floating point or vector instructions">;
def mimplicit_float : Flag<["-"], "mimplicit-float">, Group<m_Group>;
-def mrecip : Flag<["-"], "mrecip">, Group<m_Group>;
+def mrecip : Flag<["-"], "mrecip">, Group<m_Group>,
+ HelpText<"Equivalent to '-mrecip=all'">;
def mrecip_EQ : CommaJoined<["-"], "mrecip=">, Group<m_Group>, Flags<[CC1Option]>,
+ HelpText<"Control use of approximate reciprocal and reciprocal square root instructions followed by <n> iterations of "
+ "Newton-Raphson refinement. "
+ "<value> = ( ['!'] ['vec-'] ('rcp'|'sqrt') [('h'|'s'|'d')] [':'<n>] ) | 'all' | 'default' | 'none'">,
MarshallingInfoStringVector<CodeGenOpts<"Reciprocals">>;
def mprefer_vector_width_EQ : Joined<["-"], "mprefer-vector-width=">, Group<m_Group>, Flags<[CC1Option]>,
HelpText<"Specifies preferred vector width for auto-vectorization. Defaults to 'none' which allows target specific decisions.">,
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