RFR: 8307513: C2: intrinsify Math.max(long,long) and Math.min(long,long) [v2]

[Galder Zamarreño]

> This patch intrinsifies `Math.max(long, long)` and `Math.min(long, long)` in order to help improve vectorization performance.
> 
> Currently vectorization does not kick in for loops containing either of these calls because of the following error:
> 
> 
> VLoop::check_preconditions: failed: control flow in loop not allowed
> 
> 
> The control flow is due to the java implementation for these methods, e.g.
> 
> 
> public static long max(long a, long b) {
>     return (a >= b) ? a : b;
> }
> 
> 
> This patch intrinsifies the calls to replace the CmpL + Bool nodes for MaxL/MinL nodes respectively.
> By doing this, vectorization no longer finds the control flow and so it can carry out the vectorization.
> E.g.
> 
> 
> SuperWord::transform_loop:
>     Loop: N518/N126  counted [int,int),+4 (1025 iters)  main has_sfpt strip_mined
>  518  CountedLoop  === 518 246 126  [[ 513 517 518 242 521 522 422 210 ]] inner stride: 4 main of N518 strip mined !orig=[419],[247],[216],[193] !jvms: Test::test @ bci:14 (line 21)
> 
> 
> Applying the same changes to `ReductionPerf` as in https://github.com/openjdk/jdk/pull/13056, we can compare the results before and after. Before the patch, on darwin/aarch64 (M1):
> 
> 
> ==============================
> Test summary
> ==============================
>    TEST                                              TOTAL  PASS  FAIL ERROR
>    jtreg:test/hotspot/jtreg/compiler/loopopts/superword/ReductionPerf.java
>                                                          1     1     0     0
> ==============================
> TEST SUCCESS
> 
> long min   1155
> long max   1173
> 
> 
> After the patch, on darwin/aarch64 (M1):
> 
> 
> ==============================
> Test summary
> ==============================
>    TEST                                              TOTAL  PASS  FAIL ERROR
>    jtreg:test/hotspot/jtreg/compiler/loopopts/superword/ReductionPerf.java
>                                                          1     1     0     0
> ==============================
> TEST SUCCESS
> 
> long min   1042
> long max   1042
> 
> 
> This patch does not add an platform-specific backend implementations for the MaxL/MinL nodes.
> Therefore, it still relies on the macro expansion to transform those into CMoveL.
> 
> I've run tier1 and hotspot compiler tests on darwin/aarch64 and got these results:
> 
> 
> ==============================
> Test summary
> ==============================
>    TEST                                              TOTAL  PASS  FAIL ERROR
>    jtreg:test/hotspot/jtreg:tier1                     2500  2500     0     0
>>> jtreg:test/jdk:tier1                     ...

Galder Zamarreño has updated the pull request incrementally with 17 additional commits since the last revision:

 - Remove previous benchmark effort
 - Multiply array value in reduction for vectorization to kick in
 - Renamed benchmark methods
 - Add min/max benchmark that includes loops and reductions
 - Skip single array benchmarks
 - Add an intermediate % that is more representative of real life
 - Fix compilation error
 - Fix min case to distribute numbers as per probability
 - Distribute values targetting a branch percentage
   
   * Use a random increment algorithm,
   to create an array of values such that min/max
   branch percentage matches.
 - Fix format of assembly for the movl to movq switch
 - ... and 7 more: https://git.openjdk.org/jdk/compare/3dd72b89...28778c84

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/20098/files
  - new: https://git.openjdk.org/jdk/pull/20098/files/3dd72b89..28778c84

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20098&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20098&range=00-01

  Stats: 562 lines in 5 files changed: 418 ins; 132 del; 12 mod
  Patch: https://git.openjdk.org/jdk/pull/20098.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20098/head:pull/20098

PR: https://git.openjdk.org/jdk/pull/20098