[flang] Update -falias-analysis help text #73548
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As requested by @branach-space on llvm#73111. This makes it clearer that -f[no-]alias-analysis will always override -O flags, no matter their ordering.
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@llvm/pr-subscribers-clang @llvm/pr-subscribers-flang-driver Author: Tom Eccles (tblah) ChangesAs requested by @branach-space on #73111. This makes it clearer that -f[no-]alias-analysis will always override -O flags, no matter their ordering. Full diff: https://github.com/llvm/llvm-project/pull/73548.diff 3 Files Affected:
diff --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td
index 9689f12fd01417b..3a6df56496ed0f3 100644
--- a/clang/include/clang/Driver/Options.td
+++ b/clang/include/clang/Driver/Options.td
@@ -6334,8 +6334,8 @@ defm loop_versioning : BoolOptionWithoutMarshalling<"f", "version-loops-for-stri
PosFlag<SetTrue, [], [ClangOption], "Create unit-strided versions of loops">,
NegFlag<SetFalse, [], [ClangOption], "Do not create unit-strided loops (default)">>;
defm alias_analysis : BoolOptionWithoutMarshalling<"f", "alias-analysis",
- PosFlag<SetTrue, [], [], "Pass alias information on to LLVM (default when optimizing for speed)">,
- NegFlag<SetFalse, [], [], "Do not pass alias information on to LLVM (default for unoptimized builds)">>;
+ PosFlag<SetTrue, [], [], "Pass alias information on to LLVM (default when optimizing for speed). Overrides -O0.">,
+ NegFlag<SetFalse, [], [], "Do not pass alias information on to LLVM (default for unoptimized builds). Overrides -O flags.">>;
} // let Visibility = [FC1Option, FlangOption]
def J : JoinedOrSeparate<["-"], "J">,
diff --git a/flang/test/Driver/driver-help-hidden.f90 b/flang/test/Driver/driver-help-hidden.f90
index b276f1906e1a457..f005c43b1d990c4 100644
--- a/flang/test/Driver/driver-help-hidden.f90
+++ b/flang/test/Driver/driver-help-hidden.f90
@@ -26,7 +26,7 @@
! CHECK-NEXT: -D <macro>=<value> Define <macro> to <value> (or 1 if <value> omitted)
! CHECK-NEXT: -emit-llvm Use the LLVM representation for assembler and object files
! CHECK-NEXT: -E Only run the preprocessor
-! CHECK-NEXT: -falias-analysis Pass alias information on to LLVM (default when optimizing for speed)
+! CHECK-NEXT: -falias-analysis Pass alias information on to LLVM (default when optimizing for speed). Overrides -O0.
! CHECK-NEXT: -falternative-parameter-statement
! CHECK-NEXT: Enable the old style PARAMETER statement
! CHECK-NEXT: -fapprox-func Allow certain math function calls to be replaced with an approximately equivalent calculation
@@ -63,7 +63,7 @@
! CHECK-NEXT: -flto Enable LTO in 'full' mode
! CHECK-NEXT: -fms-runtime-lib=<value>
! CHECK-NEXT: Select Windows run-time library
-! CHECK-NEXT: -fno-alias-analysis Do not pass alias information on to LLVM (default for unoptimized builds)
+! CHECK-NEXT: -fno-alias-analysis Do not pass alias information on to LLVM (default for unoptimized builds). Overrides -O flags.
! CHECK-NEXT: -fno-automatic Implies the SAVE attribute for non-automatic local objects in subprograms unless RECURSIVE
! CHECK-NEXT: -fno-color-diagnostics Disable colors in diagnostics
! CHECK-NEXT: -fno-integrated-as Disable the integrated assembler
diff --git a/flang/test/Driver/driver-help.f90 b/flang/test/Driver/driver-help.f90
index 452c62541e72e61..0cd05c0a64ac062 100644
--- a/flang/test/Driver/driver-help.f90
+++ b/flang/test/Driver/driver-help.f90
@@ -22,7 +22,7 @@
! HELP-NEXT: -D <macro>=<value> Define <macro> to <value> (or 1 if <value> omitted)
! HELP-NEXT: -emit-llvm Use the LLVM representation for assembler and object files
! HELP-NEXT: -E Only run the preprocessor
-! HELP-NEXT: -falias-analysis Pass alias information on to LLVM (default when optimizing for speed)
+! HELP-NEXT: -falias-analysis Pass alias information on to LLVM (default when optimizing for speed). Overrides -O0.
! HELP-NEXT: -falternative-parameter-statement
! HELP-NEXT: Enable the old style PARAMETER statement
! HELP-NEXT: -fapprox-func Allow certain math function calls to be replaced with an approximately equivalent calculation
@@ -53,7 +53,7 @@
! HELP-NEXT: -flto Enable LTO in 'full' mode
! HELP-NEXT: -fms-runtime-lib=<value>
! HELP-NEXT: Select Windows run-time library
-! HELP-NEXT: -fno-alias-analysis Do not pass alias information on to LLVM (default for unoptimized builds)
+! HELP-NEXT: -fno-alias-analysis Do not pass alias information on to LLVM (default for unoptimized builds). Overrides -O flags.
! HELP-NEXT: -fno-automatic Implies the SAVE attribute for non-automatic local objects in subprograms unless RECURSIVE
! HELP-NEXT: -fno-color-diagnostics Disable colors in diagnostics
! HELP-NEXT: -fno-integrated-as Disable the integrated assembler
@@ -149,7 +149,7 @@
! HELP-FC1-NEXT: -emit-llvm Use the LLVM representation for assembler and object files
! HELP-FC1-NEXT: -emit-obj Emit native object files
! HELP-FC1-NEXT: -E Only run the preprocessor
-! HELP-FC1-NEXT: -falias-analysis Pass alias information on to LLVM (default when optimizing for speed)
+! HELP-FC1-NEXT: -falias-analysis Pass alias information on to LLVM (default when optimizing for speed). Overrides -O0.
! HELP-FC1-NEXT: -falternative-parameter-statement
! HELP-FC1-NEXT: Enable the old style PARAMETER statement
! HELP-FC1-NEXT: -fapprox-func Allow certain math function calls to be replaced with an approximately equivalent calculation
@@ -196,7 +196,7 @@
! HELP-FC1-NEXT: -flogical-abbreviations Enable logical abbreviations
! HELP-FC1-NEXT: -flto=<value> Set LTO mode
! HELP-FC1-NEXT: -flto Enable LTO in 'full' mode
-! HELP-FC1-NEXT: -fno-alias-analysis Do not pass alias information on to LLVM (default for unoptimized builds)
+! HELP-FC1-NEXT: -fno-alias-analysis Do not pass alias information on to LLVM (default for unoptimized builds). Overrides -O flags.
! HELP-FC1-NEXT: -fno-analyzed-objects-for-unparse
! HELP-FC1-NEXT: Do not use the analyzed objects when unparsing
! HELP-FC1-NEXT: -fno-automatic Implies the SAVE attribute for non-automatic local objects in subprograms unless RECURSIVE
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@banach-space I'm happy to change the behavior too if you'd prefer that |
banach-space
approved these changes
Nov 28, 2023
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Thanks, LGTM!
@banach-space I'm happy to change the behavior too if you'd prefer that
That would be great, but could be done independently. Up to you!
In general, I feel that -f{no-}alias-analysis interacts with -O{#N} in a way that should be avoided. But I'd need to look more into how -O{#N} are defined to have a more informed opinion. So just restricting this option for now (provided it still work for you in the intended way) should be fine.
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Closing this because I decided to just remove the |
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As requested by @branach-space on #73111. This makes it clearer that -f[no-]alias-analysis will always override -O flags, no matter their ordering.