commit 8ae3ffb29489a127f2a6242c33845dac8d50e508
author Mark Mendell <mark.p.mendell@intel.com> Wed Aug 12 21:16:41 2015 -0400
committer Mark Mendell <mark.p.mendell@intel.com> Fri Aug 14 12:58:40 2015 -0400
tree cb5cc72e4a699a8ef6b044d530539c13b02604b7
parent f67ab129d868b8355a8403a9627f96ac1e41a796

Add 'bsr' instruction to x86 and x86_64

Add support for 'bsr' instruction.  Add tests.

Change-Id: I1cd8b30d7f3f5ee7fbeef8124cc6a31bf8ce59d5
Signed-off-by: Mark Mendell <mark.p.mendell@intel.com>

compiler/utils/x86/assembler_x86.cc

diff --git a/compiler/utils/x86/assembler_x86.cc b/compiler/utils/x86/assembler_x86.cc
index 914bd56..9b3d792 100644
--- a/compiler/utils/x86/assembler_x86.cc
+++ b/compiler/utils/x86/assembler_x86.cc
@@ -158,6 +158,20 @@
   EmitUint8(0xC8 + dst);
 }
 
+void X86Assembler::bsrl(Register dst, Register src) {
+  AssemblerBuffer::EnsureCapacity ensured(&buffer_);
+  EmitUint8(0x0F);
+  EmitUint8(0xBD);
+  EmitRegisterOperand(dst, src);
+}
+
+void X86Assembler::bsrl(Register dst, const Address& src) {
+  AssemblerBuffer::EnsureCapacity ensured(&buffer_);
+  EmitUint8(0x0F);
+  EmitUint8(0xBD);
+  EmitOperand(dst, src);
+}
+
 void X86Assembler::movzxb(Register dst, ByteRegister src) {
   AssemblerBuffer::EnsureCapacity ensured(&buffer_);
   EmitUint8(0x0F);

compiler/utils/x86/assembler_x86.h

diff --git a/compiler/utils/x86/assembler_x86.h b/compiler/utils/x86/assembler_x86.h
index 850e1da..a9227f3 100644
--- a/compiler/utils/x86/assembler_x86.h
+++ b/compiler/utils/x86/assembler_x86.h
@@ -234,6 +234,8 @@
   void movntl(const Address& dst, Register src);
 
   void bswapl(Register dst);
+  void bsrl(Register dst, Register src);
+  void bsrl(Register dst, const Address& src);
 
   void movzxb(Register dst, ByteRegister src);
   void movzxb(Register dst, const Address& src);

compiler/utils/x86/assembler_x86_test.cc

diff --git a/compiler/utils/x86/assembler_x86_test.cc b/compiler/utils/x86/assembler_x86_test.cc
index c257b78..731b5f4 100644
--- a/compiler/utils/x86/assembler_x86_test.cc
+++ b/compiler/utils/x86/assembler_x86_test.cc
@@ -230,4 +230,17 @@
   DriverStr(expected, "rep_movsw");
 }
 
+TEST_F(AssemblerX86Test, Bsrl) {
+  DriverStr(RepeatRR(&x86::X86Assembler::bsrl, "bsrl %{reg2}, %{reg1}"), "bsrl");
+}
+
+TEST_F(AssemblerX86Test, BsrlAddress) {
+  GetAssembler()->bsrl(x86::Register(x86::EDI), x86::Address(
+      x86::Register(x86::EDI), x86::Register(x86::EBX), x86::TIMES_4, 12));
+  const char* expected =
+    "bsrl 0xc(%EDI,%EBX,4), %EDI\n";
+
+  DriverStr(expected, "bsrl_address");
+}
+
 }  // namespace art