[clang] 63f1c03 - [Driver] Make -fvectorize and -fslp-vectorize override -O group options (#161032)

[via cfe-commits]

Author: Fangrui Song
Date: 2025-09-27T20:38:26-07:00
New Revision: 63f1c03feea17c8236774f3b5dc811d5cb3a2364

URL: https://github.com/llvm/llvm-project/commit/63f1c03feea17c8236774f3b5dc811d5cb3a2364
DIFF: https://github.com/llvm/llvm-project/commit/63f1c03feea17c8236774f3b5dc811d5cb3a2364.diff

LOG: [Driver] Make -fvectorize and -fslp-vectorize override -O group options (#161032)

`clang -fno-slp-vectorize -O2` incorrectly enabled CC1 -vectorize-slp.
Make -fvectorize and -fslp-vectorize properly override -O, following the
convention.

Fix #160633

Added: 
    

Modified: 
    clang/lib/Driver/ToolChains/CommonArgs.cpp
    clang/test/Driver/Ofast.c
    clang/test/Driver/clang_f_opts.c

Removed: 
    


################################################################################
diff  --git a/clang/lib/Driver/ToolChains/CommonArgs.cpp b/clang/lib/Driver/ToolChains/CommonArgs.cpp
index 4902c2f3c0cbe..cce4f6487c0bd 100644
--- a/clang/lib/Driver/ToolChains/CommonArgs.cpp
+++ b/clang/lib/Driver/ToolChains/CommonArgs.cpp
@@ -3346,20 +3346,16 @@ bool tools::shouldEnableVectorizerAtOLevel(const ArgList &Args, bool isSlpVec) {
 void tools::handleVectorizeLoopsArgs(const ArgList &Args,
                                      ArgStringList &CmdArgs) {
   bool EnableVec = shouldEnableVectorizerAtOLevel(Args, false);
-  OptSpecifier vectorizeAliasOption =
-      EnableVec ? options::OPT_O_Group : options::OPT_fvectorize;
-  if (Args.hasFlag(options::OPT_fvectorize, vectorizeAliasOption,
-                   options::OPT_fno_vectorize, EnableVec))
+  if (Args.hasFlag(options::OPT_fvectorize, options::OPT_fno_vectorize,
+                   EnableVec))
     CmdArgs.push_back("-vectorize-loops");
 }
 
 void tools::handleVectorizeSLPArgs(const ArgList &Args,
                                    ArgStringList &CmdArgs) {
   bool EnableSLPVec = shouldEnableVectorizerAtOLevel(Args, true);
-  OptSpecifier SLPVectAliasOption =
-      EnableSLPVec ? options::OPT_O_Group : options::OPT_fslp_vectorize;
-  if (Args.hasFlag(options::OPT_fslp_vectorize, SLPVectAliasOption,
-                   options::OPT_fno_slp_vectorize, EnableSLPVec))
+  if (Args.hasFlag(options::OPT_fslp_vectorize, options::OPT_fno_slp_vectorize,
+                   EnableSLPVec))
     CmdArgs.push_back("-vectorize-slp");
 }
 

diff  --git a/clang/test/Driver/Ofast.c b/clang/test/Driver/Ofast.c
index 612478cc89558..e04ce036638f9 100644
--- a/clang/test/Driver/Ofast.c
+++ b/clang/test/Driver/Ofast.c
@@ -2,7 +2,7 @@
 // RUN: %clang -c -O2 -Ofast -### %s 2>&1 | FileCheck -check-prefix=CHECK-OFAST %s
 // RUN: %clang -c -fno-fast-math -Ofast -### %s 2>&1 | FileCheck -check-prefix=CHECK-OFAST %s
 // RUN: %clang -c -fno-strict-aliasing -Ofast -### %s 2>&1 | FileCheck -check-prefix=CHECK-OFAST %s
-// RUN: %clang -c -fno-vectorize -Ofast -### %s 2>&1 | FileCheck -check-prefix=CHECK-OFAST %s
+// RUN: %clang -c -fno-vectorize -Ofast -### %s 2>&1 | FileCheck -check-prefix=CHECK-OFAST-NO-VECTORIZE %s
 // RUN: %clang -c -Ofast -O2 -### -Werror %s 2>&1 | FileCheck -check-prefix=CHECK-OFAST-O2 \
 // RUN:  %if target={{.*-windows-msvc.*}} %{ --check-prefix=CHECK-OFAST-O2-ALIASING-MSVC %} \
 // RUN:  %else %{ --check-prefix=CHECK-OFAST-O2-ALIASING %} %s

diff  --git a/clang/test/Driver/clang_f_opts.c b/clang/test/Driver/clang_f_opts.c
index bdeb747aa66a3..94b983f14e3ef 100644
--- a/clang/test/Driver/clang_f_opts.c
+++ b/clang/test/Driver/clang_f_opts.c
@@ -156,7 +156,7 @@
 // RUN: %clang -### -S -O2 %s 2>&1 | FileCheck -check-prefix=CHECK-VECTORIZE %s
 // RUN: %clang -### -S -Os %s 2>&1 | FileCheck -check-prefix=CHECK-VECTORIZE %s
 // RUN: %clang -### -S -O3 %s 2>&1 | FileCheck -check-prefix=CHECK-VECTORIZE %s
-// RUN: %clang -### -S -fno-vectorize -O3 %s 2>&1 | FileCheck -check-prefix=CHECK-VECTORIZE %s
+// RUN: %clang -### -S -fno-vectorize -O3 %s 2>&1 | FileCheck -check-prefix=CHECK-NO-VECTORIZE %s
 // RUN: %clang -### -S -O1 -fvectorize %s 2>&1 | FileCheck -check-prefix=CHECK-VECTORIZE %s
 // RUN: %clang -### -S -Ofast %s 2>&1 | FileCheck -check-prefix=CHECK-VECTORIZE %s
 // RUN: %clang -### -S %s 2>&1 | FileCheck -check-prefix=CHECK-NO-VECTORIZE %s
@@ -179,7 +179,7 @@
 // RUN: %clang -### -S -Os %s 2>&1 | FileCheck -check-prefix=CHECK-SLP-VECTORIZE %s
 // RUN: %clang -### -S -Oz %s 2>&1 | FileCheck -check-prefix=CHECK-SLP-VECTORIZE %s
 // RUN: %clang -### -S -O3 %s 2>&1 | FileCheck -check-prefix=CHECK-SLP-VECTORIZE %s
-// RUN: %clang -### -S -fno-slp-vectorize -O3 %s 2>&1 | FileCheck -check-prefix=CHECK-SLP-VECTORIZE %s
+// RUN: %clang -### -S -fno-slp-vectorize -O3 %s 2>&1 | FileCheck -check-prefix=CHECK-NO-SLP-VECTORIZE %s
 // RUN: %clang -### -S -O1 -fslp-vectorize %s 2>&1 | FileCheck -check-prefix=CHECK-SLP-VECTORIZE %s
 // RUN: %clang -### -S -Ofast %s 2>&1 | FileCheck -check-prefix=CHECK-SLP-VECTORIZE %s
 // RUN: %clang -### -S %s 2>&1 | FileCheck -check-prefix=CHECK-NO-SLP-VECTORIZE %s