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8164103: C2: Broken cmpxchgb encoding on x86

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Reviewed-by: kvn, shade, psandoz
This commit is contained in:
Vladimir Ivanov 2016-08-17 22:09:57 +03:00
parent 2eab293b99
commit e3d5b655af
1 changed files with 4 additions and 4 deletions

4
hotspot/src/cpu/x86/vm/x86_64.ad

@ -7355,7 +7355,7 @@ instruct compareAndSwapB(rRegI res,
"movzbl $res, $res" %}
opcode(0x0F, 0xB0);
ins_encode(lock_prefix,
REX_reg_mem(newval, mem_ptr),
REX_breg_mem(newval, mem_ptr),
OpcP, OpcS,
reg_mem(newval, mem_ptr),
REX_breg(res), Opcode(0x0F), Opcode(0x94), reg(res), // sete
@ -7424,7 +7424,7 @@ instruct compareAndExchangeB(
"If rax == $mem_ptr then store $newval into $mem_ptr\n\t" %}
opcode(0x0F, 0xB0);
ins_encode(lock_prefix,
REX_reg_mem(newval, mem_ptr),
REX_breg_mem(newval, mem_ptr),
OpcP, OpcS,
reg_mem(newval, mem_ptr) // lock cmpxchg
);