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8217747: ZGC: Minor optimization of ZLoadBarrierStubC1

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Reviewed-by: neliasso, eosterlund
This commit is contained in:
Per Lidén
2019-01-29 10:23:38 +01:00
parent dc07b2bf32
commit 6962adcbb1
1 changed files with 9 additions and 4 deletions
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13
src/hotspot/cpu/x86/gc/z/zBarrierSetAssembler_x86.cpp
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@@ -278,11 +278,12 @@ void ZBarrierSetAssembler::generate_c1_load_barrier_stub(LIR_Assembler* ce,
Register ref = stub->ref()->as_register();
Register ref_addr = noreg;
Register tmp = noreg;
if (stub->tmp()->is_valid()) {
// Load address into tmp register
ce->leal(stub->ref_addr(), stub->tmp());
ref_addr = stub->tmp()->as_pointer_register();
ref_addr = tmp = stub->tmp()->as_pointer_register();
} else {
// Address already in register
ref_addr = stub->ref_addr()->as_address_ptr()->base()->as_pointer_register();
@@ -290,8 +291,8 @@ void ZBarrierSetAssembler::generate_c1_load_barrier_stub(LIR_Assembler* ce,
assert_different_registers(ref, ref_addr, noreg);
// Save rax unless it is the result register
if (ref != rax) {
// Save rax unless it is the result or tmp register
if (ref != rax && tmp != rax) {
__ push(rax);
}
@@ -305,9 +306,13 @@ void ZBarrierSetAssembler::generate_c1_load_barrier_stub(LIR_Assembler* ce,
// Verify result
__ verify_oop(rax, "Bad oop");
// Restore rax unless it is the result register
// Move result into place
if (ref != rax) {
__ movptr(ref, rax);
}
// Restore rax unless it is the result or tmp register
if (ref != rax && tmp != rax) {
__ pop(rax);
}