From: Rafael Espindola <rafael.espindola@gmail.com>
Date: Thu, 16 Oct 2014 20:00:02 +0000 (+0000)
Subject: Delete -std-compile-opts.
X-Git-Url: http://plrg.eecs.uci.edu/git/?p=oota-llvm.git;a=commitdiff_plain;h=2f8f1d34e39546223c960932a5ede83fa400b3f8;hp=6eaa62af77fbf5f950741b284672b676665ba07f

Delete -std-compile-opts.

These days -std-compile-opts was just a silly alias for -O3.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219951 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/docs/CommandGuide/opt.rst b/docs/CommandGuide/opt.rst
index ad5b62cf6e5..3a050f7d815 100644
--- a/docs/CommandGuide/opt.rst
+++ b/docs/CommandGuide/opt.rst
@@ -62,27 +62,14 @@ OPTIONS
  available.  The order in which the options occur on the command line are the
  order in which they are executed (within pass constraints).
 
-.. option:: -std-compile-opts
-
- This is short hand for a standard list of *compile time optimization* passes.
- It might be useful for other front end compilers as well.  To discover the
- full set of options available, use the following command:
-
- .. code-block:: sh
-
-     llvm-as < /dev/null | opt -std-compile-opts -disable-output -debug-pass=Arguments
-
 .. option:: -disable-inlining
 
- This option is only meaningful when :option:`-std-compile-opts` is given.  It
- simply removes the inlining pass from the standard list.
+ This option simply removes the inlining pass from the standard list.
 
 .. option:: -disable-opt
 
- This option is only meaningful when :option:`-std-compile-opts` is given.  It
- disables most, but not all, of the :option:`-std-compile-opts`.  The ones that
- remain are :option:`-verify`, :option:`-lower-setjmp`, and
- :option:`-funcresolve`.
+ This option is only meaningful when :option:`-std-link-opts` is given.  It
+ disables most passes.
 
 .. option:: -strip-debug
 
@@ -95,9 +82,7 @@ OPTIONS
  This option causes opt to add a verify pass after every pass otherwise
  specified on the command line (including :option:`-verify`).  This is useful
  for cases where it is suspected that a pass is creating an invalid module but
- it is not clear which pass is doing it.  The combination of
- :option:`-std-compile-opts` and :option:`-verify-each` can quickly track down
- this kind of problem.
+ it is not clear which pass is doing it.
 
 .. option:: -stats
 
diff --git a/docs/HowToSubmitABug.rst b/docs/HowToSubmitABug.rst
index 702dc0c6112..9f997d2757d 100644
--- a/docs/HowToSubmitABug.rst
+++ b/docs/HowToSubmitABug.rst
@@ -89,7 +89,7 @@ Then run:
 
 .. code-block:: bash
 
-   opt -std-compile-opts -debug-pass=Arguments foo.bc -disable-output
+   opt -O3 -debug-pass=Arguments foo.bc -disable-output
 
 This command should do two things: it should print out a list of passes, and
 then it should crash in the same way as clang.  If it doesn't crash, please
diff --git a/lib/Target/README.txt b/lib/Target/README.txt
index bf8d465d0ae..0fa56e66747 100644
--- a/lib/Target/README.txt
+++ b/lib/Target/README.txt
@@ -733,7 +733,7 @@ f (unsigned long a, unsigned long b, unsigned long c)
   return ((a & (c - 1)) != 0) | ((b & (c - 1)) != 0);
 }
 Both should combine to ((a|b) & (c-1)) != 0.  Currently not optimized with
-"clang -emit-llvm-bc | opt -std-compile-opts".
+"clang -emit-llvm-bc | opt -O3".
 
 //===---------------------------------------------------------------------===//
 
@@ -746,7 +746,7 @@ void clear_pmd_range(unsigned long start, unsigned long end)
 }
 The expression should optimize to something like
 "!((start|end)&~PMD_MASK). Currently not optimized with "clang
--emit-llvm-bc | opt -std-compile-opts".
+-emit-llvm-bc | opt -O3".
 
 //===---------------------------------------------------------------------===//
 
@@ -765,7 +765,7 @@ int f(int x, int y)
  return (abs(x)) >= 0;
 }
 This should optimize to x == INT_MIN. (With -fwrapv.)  Currently not
-optimized with "clang -emit-llvm-bc | opt -std-compile-opts".
+optimized with "clang -emit-llvm-bc | opt -O3".
 
 //===---------------------------------------------------------------------===//
 
@@ -803,117 +803,117 @@ rshift_gt (unsigned int a)
 
 All should simplify to a single comparison.  All of these are
 currently not optimized with "clang -emit-llvm-bc | opt
--std-compile-opts".
+-O3".
 
 //===---------------------------------------------------------------------===//
 
 From GCC Bug 32605:
 int c(int* x) {return (char*)x+2 == (char*)x;}
 Should combine to 0.  Currently not optimized with "clang
--emit-llvm-bc | opt -std-compile-opts" (although llc can optimize it).
+-emit-llvm-bc | opt -O3" (although llc can optimize it).
 
 //===---------------------------------------------------------------------===//
 
 int a(unsigned b) {return ((b << 31) | (b << 30)) >> 31;}
 Should be combined to  "((b >> 1) | b) & 1".  Currently not optimized
-with "clang -emit-llvm-bc | opt -std-compile-opts".
+with "clang -emit-llvm-bc | opt -O3".
 
 //===---------------------------------------------------------------------===//
 
 unsigned a(unsigned x, unsigned y) { return x | (y & 1) | (y & 2);}
 Should combine to "x | (y & 3)".  Currently not optimized with "clang
--emit-llvm-bc | opt -std-compile-opts".
+-emit-llvm-bc | opt -O3".
 
 //===---------------------------------------------------------------------===//
 
 int a(int a, int b, int c) {return (~a & c) | ((c|a) & b);}
 Should fold to "(~a & c) | (a & b)".  Currently not optimized with
-"clang -emit-llvm-bc | opt -std-compile-opts".
+"clang -emit-llvm-bc | opt -O3".
 
 //===---------------------------------------------------------------------===//
 
 int a(int a,int b) {return (~(a|b))|a;}
 Should fold to "a|~b".  Currently not optimized with "clang
--emit-llvm-bc | opt -std-compile-opts".
+-emit-llvm-bc | opt -O3".
 
 //===---------------------------------------------------------------------===//
 
 int a(int a, int b) {return (a&&b) || (a&&!b);}
 Should fold to "a".  Currently not optimized with "clang -emit-llvm-bc
-| opt -std-compile-opts".
+| opt -O3".
 
 //===---------------------------------------------------------------------===//
 
 int a(int a, int b, int c) {return (a&&b) || (!a&&c);}
 Should fold to "a ? b : c", or at least something sane.  Currently not
-optimized with "clang -emit-llvm-bc | opt -std-compile-opts".
+optimized with "clang -emit-llvm-bc | opt -O3".
 
 //===---------------------------------------------------------------------===//
 
 int a(int a, int b, int c) {return (a&&b) || (a&&c) || (a&&b&&c);}
 Should fold to a && (b || c).  Currently not optimized with "clang
--emit-llvm-bc | opt -std-compile-opts".
+-emit-llvm-bc | opt -O3".
 
 //===---------------------------------------------------------------------===//
 
 int a(int x) {return x | ((x & 8) ^ 8);}
 Should combine to x | 8.  Currently not optimized with "clang
--emit-llvm-bc | opt -std-compile-opts".
+-emit-llvm-bc | opt -O3".
 
 //===---------------------------------------------------------------------===//
 
 int a(int x) {return x ^ ((x & 8) ^ 8);}
 Should also combine to x | 8.  Currently not optimized with "clang
--emit-llvm-bc | opt -std-compile-opts".
+-emit-llvm-bc | opt -O3".
 
 //===---------------------------------------------------------------------===//
 
 int a(int x) {return ((x | -9) ^ 8) & x;}
 Should combine to x & -9.  Currently not optimized with "clang
--emit-llvm-bc | opt -std-compile-opts".
+-emit-llvm-bc | opt -O3".
 
 //===---------------------------------------------------------------------===//
 
 unsigned a(unsigned a) {return a * 0x11111111 >> 28 & 1;}
 Should combine to "a * 0x88888888 >> 31".  Currently not optimized
-with "clang -emit-llvm-bc | opt -std-compile-opts".
+with "clang -emit-llvm-bc | opt -O3".
 
 //===---------------------------------------------------------------------===//
 
 unsigned a(char* x) {if ((*x & 32) == 0) return b();}
 There's an unnecessary zext in the generated code with "clang
--emit-llvm-bc | opt -std-compile-opts".
+-emit-llvm-bc | opt -O3".
 
 //===---------------------------------------------------------------------===//
 
 unsigned a(unsigned long long x) {return 40 * (x >> 1);}
 Should combine to "20 * (((unsigned)x) & -2)".  Currently not
-optimized with "clang -emit-llvm-bc | opt -std-compile-opts".
+optimized with "clang -emit-llvm-bc | opt -O3".
 
 //===---------------------------------------------------------------------===//
 
 int g(int x) { return (x - 10) < 0; }
 Should combine to "x <= 9" (the sub has nsw).  Currently not
-optimized with "clang -emit-llvm-bc | opt -std-compile-opts".
+optimized with "clang -emit-llvm-bc | opt -O3".
 
 //===---------------------------------------------------------------------===//
 
 int g(int x) { return (x + 10) < 0; }
 Should combine to "x < -10" (the add has nsw).  Currently not
-optimized with "clang -emit-llvm-bc | opt -std-compile-opts".
+optimized with "clang -emit-llvm-bc | opt -O3".
 
 //===---------------------------------------------------------------------===//
 
 int f(int i, int j) { return i < j + 1; }
 int g(int i, int j) { return j > i - 1; }
 Should combine to "i <= j" (the add/sub has nsw).  Currently not
-optimized with "clang -emit-llvm-bc | opt -std-compile-opts".
+optimized with "clang -emit-llvm-bc | opt -O3".
 
 //===---------------------------------------------------------------------===//
 
 unsigned f(unsigned x) { return ((x & 7) + 1) & 15; }
 The & 15 part should be optimized away, it doesn't change the result. Currently
-not optimized with "clang -emit-llvm-bc | opt -std-compile-opts".
+not optimized with "clang -emit-llvm-bc | opt -O3".
 
 //===---------------------------------------------------------------------===//
 
diff --git a/test/Analysis/BasicAA/2008-04-15-Byval.ll b/test/Analysis/BasicAA/2008-04-15-Byval.ll
index 428189a8a87..2ea0314d5b6 100644
--- a/test/Analysis/BasicAA/2008-04-15-Byval.ll
+++ b/test/Analysis/BasicAA/2008-04-15-Byval.ll
@@ -1,4 +1,4 @@
-; RUN: opt < %s -std-compile-opts -S | FileCheck %s
+; RUN: opt < %s -O3 -S | FileCheck %s
 ; ModuleID = 'small2.c'
 target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
 target triple = "i386-apple-darwin8"
diff --git a/test/Assembler/2010-02-05-FunctionLocalMetadataBecomesNull.ll b/test/Assembler/2010-02-05-FunctionLocalMetadataBecomesNull.ll
index f6a8bd1b932..5cb869d7b39 100644
--- a/test/Assembler/2010-02-05-FunctionLocalMetadataBecomesNull.ll
+++ b/test/Assembler/2010-02-05-FunctionLocalMetadataBecomesNull.ll
@@ -1,4 +1,4 @@
-; RUN: opt -std-compile-opts < %s | llvm-dis | not grep badref
+; RUN: opt -O3 < %s | llvm-dis | not grep badref
 ; RUN: verify-uselistorder %s
 
 target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
diff --git a/test/CodeGen/PowerPC/ppcf128-1.ll b/test/CodeGen/PowerPC/ppcf128-1.ll
index 1047fe5d3ba..2cec934c66f 100644
--- a/test/CodeGen/PowerPC/ppcf128-1.ll
+++ b/test/CodeGen/PowerPC/ppcf128-1.ll
@@ -1,4 +1,4 @@
-; RUN: opt < %s -std-compile-opts | llc > %t
+; RUN: opt < %s -O3 | llc > %t
 ; ModuleID = 'ld3.c'
 target datalayout = "E-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f128:64:128"
 target triple = "powerpc-apple-darwin8"
diff --git a/test/CodeGen/Thumb2/2009-12-01-LoopIVUsers.ll b/test/CodeGen/Thumb2/2009-12-01-LoopIVUsers.ll
index 524e5a6b7b6..89b7148f5ec 100644
--- a/test/CodeGen/Thumb2/2009-12-01-LoopIVUsers.ll
+++ b/test/CodeGen/Thumb2/2009-12-01-LoopIVUsers.ll
@@ -1,4 +1,4 @@
-; RUN: opt < %s -std-compile-opts | \
+; RUN: opt < %s -O3 | \
 ; RUN:   llc -mtriple=thumbv7-apple-darwin10 -mattr=+neon | FileCheck %s
 
 define void @fred(i32 %three_by_three, i8* %in, double %dt1, i32 %x_size, i32 %y_size, i8* %bp) nounwind {
diff --git a/test/CodeGen/X86/asm-block-labels.ll b/test/CodeGen/X86/asm-block-labels.ll
index 6dbfb16a6d5..93524386c6b 100644
--- a/test/CodeGen/X86/asm-block-labels.ll
+++ b/test/CodeGen/X86/asm-block-labels.ll
@@ -1,4 +1,4 @@
-; RUN: opt < %s -std-compile-opts | llc -no-integrated-as
+; RUN: opt < %s -O3 | llc -no-integrated-as
 ; ModuleID = 'block12.c'
 target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
 target triple = "i686-apple-darwin8"
diff --git a/test/CodeGen/X86/dllimport-x86_64.ll b/test/CodeGen/X86/dllimport-x86_64.ll
index 666409fd4c0..839bca4f3c3 100644
--- a/test/CodeGen/X86/dllimport-x86_64.ll
+++ b/test/CodeGen/X86/dllimport-x86_64.ll
@@ -4,7 +4,7 @@
 ; RUN: llc -mtriple x86_64-pc-mingw32 -O0 < %s | FileCheck %s -check-prefix=FAST
 ; PR6275
 ;
-; RUN: opt -mtriple x86_64-pc-win32 -std-compile-opts -S < %s | FileCheck %s -check-prefix=OPT
+; RUN: opt -mtriple x86_64-pc-win32 -O3 -S < %s | FileCheck %s -check-prefix=OPT
 
 @Var1 = external dllimport global i32
 @Var2 = available_externally dllimport unnamed_addr constant i32 1
diff --git a/test/CodeGen/X86/dllimport.ll b/test/CodeGen/X86/dllimport.ll
index 695bfce821b..231ad65740b 100644
--- a/test/CodeGen/X86/dllimport.ll
+++ b/test/CodeGen/X86/dllimport.ll
@@ -4,7 +4,7 @@
 ; RUN: llc -mtriple i386-pc-mingw32 -O0 < %s | FileCheck %s -check-prefix=FAST
 ; PR6275
 ;
-; RUN: opt -mtriple i386-pc-win32 -std-compile-opts -S < %s | FileCheck %s -check-prefix=OPT
+; RUN: opt -mtriple i386-pc-win32 -O3 -S < %s | FileCheck %s -check-prefix=OPT
 
 @Var1 = external dllimport global i32
 @Var2 = available_externally dllimport unnamed_addr constant i32 1
diff --git a/test/CodeGen/X86/nancvt.ll b/test/CodeGen/X86/nancvt.ll
index 8036710b225..8a665fa79cf 100644
--- a/test/CodeGen/X86/nancvt.ll
+++ b/test/CodeGen/X86/nancvt.ll
@@ -1,4 +1,4 @@
-; RUN: opt < %s -std-compile-opts | llc > %t
+; RUN: opt < %s -O3 | llc > %t
 ; RUN: grep 2147027116 %t | count 3
 ; RUN: grep 2147228864 %t | count 3
 ; RUN: grep 2146502828 %t | count 3
diff --git a/test/Feature/weak_constant.ll b/test/Feature/weak_constant.ll
index fba7f12e1de..d331bf59e83 100644
--- a/test/Feature/weak_constant.ll
+++ b/test/Feature/weak_constant.ll
@@ -1,4 +1,4 @@
-; RUN: opt < %s -std-compile-opts -S > %t
+; RUN: opt < %s -O3 -S > %t
 ; RUN:   grep undef %t | count 1
 ; RUN:   grep 5 %t | count 1
 ; RUN:   grep 7 %t | count 1
diff --git a/test/Transforms/BranchFolding/2007-10-19-InlineAsmDirectives.ll b/test/Transforms/BranchFolding/2007-10-19-InlineAsmDirectives.ll
index 598ea0e354e..d4b94fe62c7 100644
--- a/test/Transforms/BranchFolding/2007-10-19-InlineAsmDirectives.ll
+++ b/test/Transforms/BranchFolding/2007-10-19-InlineAsmDirectives.ll
@@ -1,4 +1,4 @@
-; RUN: opt < %s -std-compile-opts -o - | llc -no-integrated-as -o - | grep bork_directive | wc -l | grep 2
+; RUN: opt < %s -O3 -o - | llc -no-integrated-as -o - | grep bork_directive | wc -l | grep 2
 
 ;; We don't want branch folding to fold asm directives.
 
diff --git a/test/Transforms/InstCombine/2007-10-10-EliminateMemCpy.ll b/test/Transforms/InstCombine/2007-10-10-EliminateMemCpy.ll
index fe935f96e9e..656fb34061d 100644
--- a/test/Transforms/InstCombine/2007-10-10-EliminateMemCpy.ll
+++ b/test/Transforms/InstCombine/2007-10-10-EliminateMemCpy.ll
@@ -1,5 +1,5 @@
 ; RUN: opt < %s -instcombine -S | not grep call
-; RUN: opt < %s -std-compile-opts -S | not grep xyz
+; RUN: opt < %s -O3 -S | not grep xyz
 target datalayout = "E-p:64:64:64-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128"
 
 @.str = internal constant [4 x i8] c"xyz\00"		; <[4 x i8]*> [#uses=1]
diff --git a/test/Transforms/Mem2Reg/2007-08-27-VolatileLoadsStores.ll b/test/Transforms/Mem2Reg/2007-08-27-VolatileLoadsStores.ll
index ea0d515498c..ea581d197e5 100644
--- a/test/Transforms/Mem2Reg/2007-08-27-VolatileLoadsStores.ll
+++ b/test/Transforms/Mem2Reg/2007-08-27-VolatileLoadsStores.ll
@@ -1,4 +1,4 @@
-; RUN: opt < %s -std-compile-opts -S | grep volatile | count 3
+; RUN: opt < %s -O3 -S | grep volatile | count 3
 ; PR1520
 ; Don't promote load volatiles/stores. This is really needed to handle setjmp/lonjmp properly.
 
diff --git a/tools/bugpoint/bugpoint.cpp b/tools/bugpoint/bugpoint.cpp
index a575861ede2..d0bade507d2 100644
--- a/tools/bugpoint/bugpoint.cpp
+++ b/tools/bugpoint/bugpoint.cpp
@@ -62,10 +62,6 @@ UseValgrind("enable-valgrind",
 static cl::list<const PassInfo*, bool, PassNameParser>
 PassList(cl::desc("Passes available:"), cl::ZeroOrMore);
 
-static cl::opt<bool>
-StandardCompileOpts("std-compile-opts",
-                   cl::desc("Include the standard compile time optimizations"));
-
 static cl::opt<bool>
 StandardLinkOpts("std-link-opts",
                  cl::desc("Include the standard link time optimizations"));
@@ -170,12 +166,6 @@ int main(int argc, char **argv) {
   if (D.addSources(InputFilenames)) return 1;
 
   AddToDriver PM(D);
-  if (StandardCompileOpts) {
-    PassManagerBuilder Builder;
-    Builder.OptLevel = 3;
-    Builder.Inliner = createFunctionInliningPass();
-    Builder.populateModulePassManager(PM);
-  }
 
   if (StandardLinkOpts) {
     PassManagerBuilder Builder;
diff --git a/tools/opt/opt.cpp b/tools/opt/opt.cpp
index f1a945a6000..8a3362912c7 100644
--- a/tools/opt/opt.cpp
+++ b/tools/opt/opt.cpp
@@ -108,10 +108,6 @@ static cl::opt<bool>
 DisableOptimizations("disable-opt",
                      cl::desc("Do not run any optimization passes"));
 
-static cl::opt<bool>
-StandardCompileOpts("std-compile-opts",
-                   cl::desc("Include the standard compile time optimizations"));
-
 static cl::opt<bool>
 StandardLinkOpts("std-link-opts",
                  cl::desc("Include the standard link time optimizations"));
@@ -233,26 +229,6 @@ static void AddOptimizationPasses(PassManagerBase &MPM,FunctionPassManager &FPM,
   Builder.populateModulePassManager(MPM);
 }
 
-static void AddStandardCompilePasses(PassManagerBase &PM) {
-  PM.add(createVerifierPass());                  // Verify that input is correct
-
-  // If the -strip-debug command line option was specified, do it.
-  if (StripDebug)
-    addPass(PM, createStripSymbolsPass(true));
-
-  // Verify debug info only after it's (possibly) stripped.
-  PM.add(createDebugInfoVerifierPass());
-
-  if (DisableOptimizations) return;
-
-  // -std-compile-opts adds the same module passes as -O3.
-  PassManagerBuilder Builder;
-  if (!DisableInline)
-    Builder.Inliner = createFunctionInliningPass();
-  Builder.OptLevel = 3;
-  Builder.populateModulePassManager(PM);
-}
-
 static void AddStandardLinkPasses(PassManagerBase &PM) {
   PassManagerBuilder Builder;
   Builder.VerifyInput = true;
@@ -479,21 +455,12 @@ int main(int argc, char **argv) {
     NoOutput = true;
   }
 
-  // If the -strip-debug command line option was specified, add it.  If
-  // -std-compile-opts was also specified, it will handle StripDebug.
-  if (StripDebug && !StandardCompileOpts)
+  // If the -strip-debug command line option was specified, add it.
+  if (StripDebug)
     addPass(Passes, createStripSymbolsPass(true));
 
   // Create a new optimization pass for each one specified on the command line
   for (unsigned i = 0; i < PassList.size(); ++i) {
-    // Check to see if -std-compile-opts was specified before this option.  If
-    // so, handle it.
-    if (StandardCompileOpts &&
-        StandardCompileOpts.getPosition() < PassList.getPosition(i)) {
-      AddStandardCompilePasses(Passes);
-      StandardCompileOpts = false;
-    }
-
     if (StandardLinkOpts &&
         StandardLinkOpts.getPosition() < PassList.getPosition(i)) {
       AddStandardLinkPasses(Passes);
@@ -566,12 +533,6 @@ int main(int argc, char **argv) {
       Passes.add(createPrintModulePass(errs()));
   }
 
-  // If -std-compile-opts was specified at the end of the pass list, add them.
-  if (StandardCompileOpts) {
-    AddStandardCompilePasses(Passes);
-    StandardCompileOpts = false;
-  }
-
   if (StandardLinkOpts) {
     AddStandardLinkPasses(Passes);
     StandardLinkOpts = false;
diff --git a/utils/findmisopt b/utils/findmisopt
index 88f991a634c..24052209428 100755
--- a/utils/findmisopt
+++ b/utils/findmisopt
@@ -74,8 +74,8 @@ echo "Unoptimized program: $prog"
 echo "  Optimized program: $optprog"
 
 # Define the list of optimizations to run. This comprises the same set of 
-# optimizations that opt -std-compile-opts and gccld run, in the same order.
-opt_switches=`llvm-as < /dev/null -o - | opt -std-compile-opts -disable-output -debug-pass=Arguments 2>&1 | sed 's/Pass Arguments: //'`
+# optimizations that opt -O3 runs, in the same order.
+opt_switches=`llvm-as < /dev/null -o - | opt -O3 -disable-output -debug-pass=Arguments 2>&1 | sed 's/Pass Arguments: //'`
 all_switches="$opt_switches"
 echo "Passes : $all_switches"