RFR: 8310192: RISC-V: Merge vector min & max instructs with similar match rules

[Gui Cao]

On Fri, 16 Jun 2023 10:45:03 GMT, Ludovic Henry <luhenry at openjdk.org> wrote:

>> Hi, We merged vector min and max instructions with similar matching rules in this PR, and modified some comments of the copy_memory function in stubGenerator_riscv.cpp.
>> We can use Float256VectorTests.java Double256VectorTests.java to emit vmax_fp/vmin_fp nodes and the compilation log is as follows:
>> 
>> 13e     B22: #	out( B50 B23 ) <- in( B21 )  Freq: 76.431
>> 13e     loadV V2, [R17]	# vector (rvv)
>> 146     vmax_fp V3, V1, V2
>> 15e     bgeu  R9, R13, B50	#@cmpU_branch  P=0.000001 C=-1.000000
>> 
>> 
>> 13e     B22: #	out( B50 B23 ) <- in( B21 )  Freq: 76.431
>> 13e     loadV V2, [R17]	# vector (rvv)
>> 146     vmin_fp V3, V1, V2
>> 15e     bgeu  R9, R13, B50	#@cmpU_branch  P=0.000001 C=-1.000000
>> 
>> Please take a look and have some reviews. Thanks a lot.
>> 
>> ## Testing:
>> - [x] Tier1 tests (release)
>> - [x] Tier2 tests (release)
>> - [x] Tier3 tests (release)
>> - [x] test/jdk/jdk/incubator/vector (fastdebug)
>
> Marked as reviewed by luhenry (Committer).

@luhenry @RealFYang Thanks for the review!

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PR Comment: https://git.openjdk.org/jdk/pull/14510#issuecomment-1607444898