diff options
| -rw-r--r-- | clang/lib/Driver/Tools.cpp | 9 | ||||
| -rw-r--r-- | clang/test/Driver/preserve-uselistorder.c | 9 | ||||
| -rw-r--r-- | clang/test/Driver/save-temps.c | 2 |
3 files changed, 20 insertions, 0 deletions
diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp index 1e34d7f403a..2d2526c4bdf 100644 --- a/clang/lib/Driver/Tools.cpp +++ b/clang/lib/Driver/Tools.cpp @@ -2678,6 +2678,15 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA, assert(JA.getType() == types::TY_PP_Asm && "Unexpected output type!"); } + + // Preserve use-list order by default when emitting bitcode, so that + // loading the bitcode up in 'opt' or 'llc' and running passes gives the + // same result as running passes here. For LTO, we don't need to preserve + // the use-list order, since serialization to bitcode is part of the flow. + if (JA.getType() == types::TY_LLVM_BC) { + CmdArgs.push_back("-mllvm"); + CmdArgs.push_back("-preserve-bc-uselistorder"); + } } // We normally speed up the clang process a bit by skipping destructors at diff --git a/clang/test/Driver/preserve-uselistorder.c b/clang/test/Driver/preserve-uselistorder.c new file mode 100644 index 00000000000..ac022300f2e --- /dev/null +++ b/clang/test/Driver/preserve-uselistorder.c @@ -0,0 +1,9 @@ +// RUN: %clang -target x86_64-apple-darwin -emit-llvm -arch x86_64 %s -### 2>&1 \ +// RUN: | FileCheck %s +// CHECK: "-emit-llvm-bc" +// CHECK: "-preserve-bc-uselistorder" + +// RUN: %clang -target x86_64-apple-darwin -flto -arch x86_64 %s -### 2>&1 \ +// RUN: | FileCheck -check-prefix=LTO %s +// LTO: "-emit-llvm-bc" +// LTO-NOT: "-preserve-bc-uselistorder" diff --git a/clang/test/Driver/save-temps.c b/clang/test/Driver/save-temps.c index 438d748932b..0b1a17f34f5 100644 --- a/clang/test/Driver/save-temps.c +++ b/clang/test/Driver/save-temps.c @@ -1,6 +1,7 @@ // RUN: %clang -target x86_64-apple-darwin -save-temps -arch x86_64 %s -### 2>&1 \ // RUN: | FileCheck %s // CHECK: "-o" "save-temps.i" +// CHECK: "-preserve-bc-uselistorder" // CHECK: "-disable-llvm-optzns" // CHECK: "-o" "save-temps.bc" // CHECK: "-o" "save-temps.s" @@ -12,6 +13,7 @@ // RUN: %clang -target x86_64-apple-darwin -save-temps=cwd -arch x86_64 %s -### 2>&1 \ // RUN: | FileCheck %s -check-prefix=CWD // CWD: "-o" "save-temps.i" +// CWD: "-preserve-bc-uselistorder" // CWD: "-disable-llvm-optzns" // CWD: "-o" "save-temps.bc" // CWD: "-o" "save-temps.s" |
