8164103: C2: Broken cmpxchgb encoding on x86
Reviewed-by: kvn, shade, psandoz
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2eab293b99
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@ -986,7 +986,7 @@ void MachEpilogNode::emit(CodeBuffer& cbuf, PhaseRegAlloc* ra_) const
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emit_opcode(cbuf, 0x58 | RBP_enc);
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if (StackReservedPages > 0 && C->has_reserved_stack_access()) {
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__ reserved_stack_check();
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__ reserved_stack_check();
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}
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if (do_polling() && C->is_method_compilation()) {
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@ -7355,7 +7355,7 @@ instruct compareAndSwapB(rRegI res,
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"movzbl $res, $res" %}
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opcode(0x0F, 0xB0);
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ins_encode(lock_prefix,
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REX_reg_mem(newval, mem_ptr),
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REX_breg_mem(newval, mem_ptr),
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OpcP, OpcS,
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reg_mem(newval, mem_ptr),
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REX_breg(res), Opcode(0x0F), Opcode(0x94), reg(res), // sete
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@ -7380,7 +7380,7 @@ instruct compareAndSwapS(rRegI res,
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opcode(0x0F, 0xB1);
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ins_encode(lock_prefix,
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SizePrefix,
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REX_reg_mem(newval, mem_ptr),
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REX_reg_mem(newval, mem_ptr),
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OpcP, OpcS,
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reg_mem(newval, mem_ptr),
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REX_breg(res), Opcode(0x0F), Opcode(0x94), reg(res), // sete
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@ -7424,7 +7424,7 @@ instruct compareAndExchangeB(
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"If rax == $mem_ptr then store $newval into $mem_ptr\n\t" %}
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opcode(0x0F, 0xB0);
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ins_encode(lock_prefix,
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REX_reg_mem(newval, mem_ptr),
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REX_breg_mem(newval, mem_ptr),
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OpcP, OpcS,
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reg_mem(newval, mem_ptr) // lock cmpxchg
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);
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