implement aliases for shld/shrd, part of rdar://8418316
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@113937 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/AsmParser/X86AsmParser.cpp b/lib/Target/X86/AsmParser/X86AsmParser.cpp
index 4856cc9..7afa7e6 100644
--- a/lib/Target/X86/AsmParser/X86AsmParser.cpp
+++ b/lib/Target/X86/AsmParser/X86AsmParser.cpp
@@ -833,6 +833,15 @@
Operands.push_back(X86Operand::CreateImm(One, NameLoc, NameLoc));
std::swap(Operands[1], Operands[2]);
}
+
+ // FIXME: Hack to handle recognize "sh[lr]d op,op" -> "shld $1, op,op".
+ if ((Name.startswith("shld") || Name.startswith("shrd")) &&
+ Operands.size() == 3) {
+ const MCExpr *One = MCConstantExpr::Create(1, getParser().getContext());
+ Operands.insert(Operands.begin()+1,
+ X86Operand::CreateImm(One, NameLoc, NameLoc));
+ }
+
// FIXME: Hack to handle recognize "in[bwl] <op>". Canonicalize it to
// "inb <op>, %al".
diff --git a/test/MC/AsmParser/X86/x86_instructions.s b/test/MC/AsmParser/X86/x86_instructions.s
index 3bd2a30..0f0c1ed 100644
--- a/test/MC/AsmParser/X86/x86_instructions.s
+++ b/test/MC/AsmParser/X86/x86_instructions.s
@@ -268,3 +268,14 @@
rcll 0xdeadbeef(%ebx,%ecx,8)
rcr %ecx
rcrl 0x12345678
+
+// rdar://8418316
+// CHECK: shldw $1, %bx, %bx
+// CHECK: shldw $1, %bx, %bx
+// CHECK: shrdw $1, %bx, %bx
+// CHECK: shrdw $1, %bx, %bx
+
+shld %bx,%bx
+shld $1, %bx,%bx
+shrd %bx,%bx
+shrd $1, %bx,%bx