superfluous TEST instruction

[Ulf Zibis]

Much thanks, but not visible on the web. :-(
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=5044093

-Ulf


Am 19.03.2010 19:43, schrieb Vladimir Kozlov:
> RFE: 5044093
>
> Vladimir
>
> Ulf Zibis wrote:
>> If I understand the Intel manual right, the zero flag is already set 
>> from the SHR instruction, so newly testing on 0 by TEST instruction 
>> seems superfluous.
>>
>> Am I wrong ?
>>
>>
>>   0x00b88942: shr    $0x10,%eax         ;*iushr
>>                                         ; - 
>> java.lang.Character::isBMPCodePoint at 3 (line 2737)
>>                                         ; - 
>> java.lang.Character::charCount at 1 (line 2907)
>>                                         ; - 
>> java.lang.Character::charCount at 26 (line 2946)
>>   0x00b88945: test   %eax,%eax
>>   0x00b88947: je     0x00b88973         ;*ifeq
>>                                         ; - 
>> java.lang.Character::charCount at 4 (line 2907)
>>                                         ; - 
>> java.lang.Character::charCount at 26 (line 2946)
>>
>>
>> -Ulf
>>
>>
>
>