From d73566609ea050ab73e0a3cda1c3840fd1a3d8fb Mon Sep 17 00:00:00 2001
From: Dan Gohman <gohman@apple.com>
Date: Tue, 17 Mar 2009 02:17:27 +0000
Subject: [PATCH] Recognize "bswapq" as an alternate spelling for the bswap
 instruction.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@67071 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/X86/X86TargetAsmInfo.cpp  |  4 ++--
 test/CodeGen/X86/bswap-inline-asm.ll | 12 ++++++++++++
 2 files changed, 14 insertions(+), 2 deletions(-)
 create mode 100644 test/CodeGen/X86/bswap-inline-asm.ll

diff --git a/lib/Target/X86/X86TargetAsmInfo.cpp b/lib/Target/X86/X86TargetAsmInfo.cpp
index 226feb7c1e6..f3faa7022cd 100644
--- a/lib/Target/X86/X86TargetAsmInfo.cpp
+++ b/lib/Target/X86/X86TargetAsmInfo.cpp
@@ -411,8 +411,8 @@ bool X86TargetAsmInfo<BaseTAI>::ExpandInlineAsm(CallInst *CI) const {
 
     // bswap $0
     if (AsmPieces.size() == 2 &&
-        AsmPieces[0] == "bswap" && (AsmPieces[1] == "$0" ||
-                                    AsmPieces[1] == "${0:q}")) {
+        (AsmPieces[0] == "bswap" || AsmPieces[0] == "bswapq") &&
+        (AsmPieces[1] == "$0" || AsmPieces[1] == "${0:q}")) {
       // No need to check constraints, nothing other than the equivalent of
       // "=r,0" would be valid here.
       return LowerToBSwap(CI);
diff --git a/test/CodeGen/X86/bswap-inline-asm.ll b/test/CodeGen/X86/bswap-inline-asm.ll
new file mode 100644
index 00000000000..c44d845c832
--- /dev/null
+++ b/test/CodeGen/X86/bswap-inline-asm.ll
@@ -0,0 +1,12 @@
+; RUN: llvm-as < %s | llc -march=x86-64 > %t
+; RUN: not grep APP %t
+; RUN: grep bswapq %t | count 2
+
+define i64 @foo(i64 %x) nounwind {
+	%asmtmp = tail call i64 asm "bswap $0", "=r,0,~{dirflag},~{fpsr},~{flags}"(i64 %x) nounwind
+	ret i64 %asmtmp
+}
+define i64 @bar(i64 %x) nounwind {
+	%asmtmp = tail call i64 asm "bswapq ${0:q}", "=r,0,~{dirflag},~{fpsr},~{flags}"(i64 %x) nounwind
+	ret i64 %asmtmp
+}