From 80629c85f1041df41b5158ebb03a4725af6ecd90 Mon Sep 17 00:00:00 2001
From: Bill Wendling <isanbard@gmail.com>
Date: Fri, 19 Oct 2007 21:09:55 +0000
Subject: [PATCH] Don't branch fold inline asm statements.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43191 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/BranchFolding.cpp                  |  3 ++-
 test/CFrontend/2007-10-15-VoidPtr.c            |  3 +--
 .../2007-10-19-InlineAsmDirectives.ll          | 18 ++++++++++++++++++
 3 files changed, 21 insertions(+), 3 deletions(-)
 create mode 100644 test/Transforms/BranchFolding/2007-10-19-InlineAsmDirectives.ll

diff --git a/lib/CodeGen/BranchFolding.cpp b/lib/CodeGen/BranchFolding.cpp
index 055302f153a..d523bf585ae 100644
--- a/lib/CodeGen/BranchFolding.cpp
+++ b/lib/CodeGen/BranchFolding.cpp
@@ -271,7 +271,8 @@ static unsigned ComputeCommonTailLength(MachineBasicBlock *MBB1,
   unsigned TailLen = 0;
   while (I1 != MBB1->begin() && I2 != MBB2->begin()) {
     --I1; --I2;
-    if (!I1->isIdenticalTo(I2)) {
+    if (!I1->isIdenticalTo(I2) || 
+        I1->getOpcode() == TargetInstrInfo::INLINEASM) {
       ++I1; ++I2;
       break;
     }
diff --git a/test/CFrontend/2007-10-15-VoidPtr.c b/test/CFrontend/2007-10-15-VoidPtr.c
index 80eebdca447..c5948b93e16 100644
--- a/test/CFrontend/2007-10-15-VoidPtr.c
+++ b/test/CFrontend/2007-10-15-VoidPtr.c
@@ -1,5 +1,4 @@
-// RUN: llvm-gcc -S %s -o /dev/null
+// RUN: %llvmgcc -S %s -o /dev/null
 void bork(void **data) {
   (*(unsigned short *) (&(data[37])[927]) = 0);
 }
-
diff --git a/test/Transforms/BranchFolding/2007-10-19-InlineAsmDirectives.ll b/test/Transforms/BranchFolding/2007-10-19-InlineAsmDirectives.ll
new file mode 100644
index 00000000000..8afdcae50ae
--- /dev/null
+++ b/test/Transforms/BranchFolding/2007-10-19-InlineAsmDirectives.ll
@@ -0,0 +1,18 @@
+; RUN: llvm-as < %s | opt -std-compile-opts -o - | llc -o - | grep bork_directive | wc -l | grep 2
+
+;; We don't want branch folding to fold asm directives.
+
+define void @bork(i32 %param) {
+entry:
+	%tmp = icmp eq i32 %param, 0
+        br i1 %tmp, label %cond_true, label %cond_false
+
+cond_true:   
+        call void asm sideeffect ".bork_directive /* ${0:c}:${1:c} */", "i,i,~{dirflag},~{fpsr},~{flags}"( i32 37, i32 927 )
+        ret void
+
+cond_false:
+	call void asm sideeffect ".foo_directive ${0:c}:${1:c}", "i,i,~{dirflag},~{fpsr},~{flags}"( i32 37, i32 927 )
+        call void asm sideeffect ".bork_directive /* ${0:c}:${1:c} */", "i,i,~{dirflag},~{fpsr},~{flags}"( i32 37, i32 927 )
+        ret void
+}
-- 
2.34.1