Optimize suspend checks in optimizing compiler.

- Remove the ones added during graph build (they were added
  for the baseline code generator).
- Emit them at loop back edges after phi moves, so that the test
  can directly jump to the loop header.
- Fix x86 and x86_64 suspend check by using cmpw instead of cmpl.

Change-Id: I6fad5795a55705d86c9e1cb85bf5d63dadfafa2a

1 files changed, 8 insertions, 0 deletions

diff --git a/compiler/utils/x86/assembler_x86.cc b/compiler/utils/x86/assembler_x86.cc
index 2c9bc28923..f888d46dd1 100644
--- a/compiler/utils/x86/assembler_x86.cc
+++ b/compiler/utils/x86/assembler_x86.cc
@@ -746,6 +746,7 @@ void X86Assembler::xchgl(Register dst, Register src) {
   EmitRegisterOperand(dst, src);
 }
 
+
 void X86Assembler::xchgl(Register reg, const Address& address) {
   AssemblerBuffer::EnsureCapacity ensured(&buffer_);
   EmitUint8(0x87);
@@ -753,6 +754,13 @@ void X86Assembler::xchgl(Register reg, const Address& address) {
 }
 
 
+void X86Assembler::cmpw(const Address& address, const Immediate& imm) {
+  AssemblerBuffer::EnsureCapacity ensured(&buffer_);
+  EmitUint8(0x66);
+  EmitComplex(7, address, imm);
+}
+
+
 void X86Assembler::cmpl(Register reg, const Immediate& imm) {
   AssemblerBuffer::EnsureCapacity ensured(&buffer_);
   EmitComplex(7, Operand(reg), imm);