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8209651: better TLS poll for x64 C2

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Reviewed-by: kvn
This commit is contained in:
Dean Long 2018-08-22 13:53:48 -07:00
parent ed3779b175
commit 2406a52bd6
1 changed files with 3 additions and 26 deletions
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29
src/hotspot/cpu/x86/x86_64.ad
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@ -317,18 +317,6 @@ reg_class ptr_rsp_reg(RSP, RSP_H);
// Singleton class for TLS pointer
reg_class ptr_r15_reg(R15, R15_H);
// The registers which can be used for
// a thread local safepoint poll
// * R12 is reserved for heap base
// * R13 cannot be encoded for addressing without an offset byte
// * R15 is reserved for the JavaThread
reg_class ptr_rex_reg(R8, R8_H,
R9, R9_H,
R10, R10_H,
R11, R11_H,
R14, R14_H);
// Class for all long registers (excluding RSP)
reg_class long_reg_with_rbp(RAX, RAX_H,
RDX, RDX_H,
@ -3557,16 +3545,6 @@ operand r15_RegP()
interface(REG_INTER);
%}
operand rex_RegP()
%{
constraint(ALLOC_IN_RC(ptr_rex_reg));
match(RegP);
match(rRegP);
format %{ %}
interface(REG_INTER);
%}
operand rRegL()
%{
constraint(ALLOC_IN_RC(long_reg));
@ -12360,7 +12338,7 @@ instruct safePoint_poll_far(rFlagsReg cr, rRegP poll)
ins_pipe(ialu_reg_mem);
%}
instruct safePoint_poll_tls(rFlagsReg cr, rex_RegP poll)
instruct safePoint_poll_tls(rFlagsReg cr, rRegP poll)
%{
predicate(SafepointMechanism::uses_thread_local_poll());
match(SafePoint poll);
@ -12369,13 +12347,12 @@ instruct safePoint_poll_tls(rFlagsReg cr, rex_RegP poll)
format %{ "testl rax, [$poll]\t"
"# Safepoint: poll for GC" %}
ins_cost(125);
size(3); /* setting an explicit size will cause debug builds to assert if size is incorrect */
size(4); /* setting an explicit size will cause debug builds to assert if size is incorrect */
ins_encode %{
__ relocate(relocInfo::poll_type);
address pre_pc = __ pc();
__ testl(rax, Address($poll$$Register, 0));
address post_pc = __ pc();
guarantee(pre_pc[0] == 0x41 && pre_pc[1] == 0x85, "must emit #rex test-ax [reg]");
assert(nativeInstruction_at(pre_pc)->is_safepoint_poll(), "must emit test %%eax [reg]");
%}
ins_pipe(ialu_reg_mem);
%}