The comment in the tests say:
@summary Add C2 x86 Superword support for scalar sum reduction optimizations : float test

and the feature itself seems to be x86 only: JDK-8074981 , yet these tests are running on Solaris SPARC. In JPRT where these end up taking minutes to run:

solaris_sparcv9_5.11-fastdebug-c2-hotspot_compiler_3 success(45m 48s)

TEST: compiler/loopopts/superword/ProdRed_Double.java
  build: 0.054 seconds
  compile: 0.053 seconds
  main: 21.08 seconds
  build: 0.0 seconds
  main: 21.151 seconds
  build: 0.0 seconds
  main: 24.229 seconds
  build: 0.0 seconds
  main: 24.123 seconds
  build: 0.001 seconds
  main: 23.9 seconds
  build: 0.0 seconds
  main: 23.902 seconds
  build: 0.0 seconds
  main: 23.446 seconds
  build: 0.0 seconds
  main: 23.554 seconds
TEST RESULT: Passed. Execution successful
--------------------------------------------------
TEST: compiler/loopopts/superword/ProdRed_Float.java
  build: 0.043 seconds
  compile: 0.042 seconds
  main: 18.001 seconds
  build: 0.0 seconds
  main: 17.987 seconds
  build: 0.0 seconds
  main: 20.413 seconds
  build: 0.001 seconds
  main: 20.429 seconds
  build: 0.0 seconds
  main: 19.81 seconds
  build: 0.001 seconds
  main: 19.972 seconds
  build: 0.001 seconds
  main: 21.394 seconds
  build: 0.0 seconds
  main: 21.383 seconds
TEST RESULT: Passed. Execution successful
--------------------------------------------------
TEST: compiler/loopopts/superword/ProdRed_Int.java
  build: 0.041 seconds
  compile: 0.041 seconds
  main: 9.789 seconds
  build: 0.0 seconds
  main: 9.735 seconds
  build: 0.0 seconds
  main: 11.248 seconds
  build: 0.0 seconds
  main: 11.218 seconds
  build: 0.0 seconds
  main: 12.541 seconds
  build: 0.001 seconds
  main: 12.556 seconds
  build: 0.0 seconds
  main: 14.821 seconds
  build: 0.001 seconds
  main: 14.799 seconds
TEST RESULT: Passed. Execution successful
--------------------------------------------------
TEST: compiler/loopopts/superword/ReductionPerf.java
  build: 0.085 seconds
  compile: 0.085 seconds
  main: 16.049 seconds
  build: 0.001 seconds
  main: 15.983 seconds
TEST RESULT: Passed. Execution successful
--------------------------------------------------
TEST: compiler/loopopts/superword/SumRed_Double.java
  build: 0.051 seconds
  compile: 0.051 seconds
  main: 28.394 seconds
  build: 0.001 seconds
  main: 28.437 seconds
  build: 0.0 seconds
  main: 34.228 seconds
  build: 0.001 seconds
  main: 34.239 seconds
  build: 0.001 seconds
  main: 32.178 seconds
  build: 0.0 seconds
  main: 32.176 seconds
  build: 0.001 seconds
  main: 34.29 seconds
  build: 0.0 seconds
  main: 34.477 seconds
TEST RESULT: Passed. Execution successful
--------------------------------------------------
TEST: compiler/loopopts/superword/SumRed_Float.java
  build: 0.052 seconds
  compile: 0.052 seconds
  main: 31.96 seconds
  build: 0.0 seconds
  main: 31.873 seconds
  build: 0.001 seconds
  main: 32.447 seconds
  build: 0.0 seconds
  main: 32.478 seconds
  build: 0.0 seconds
  main: 34.243 seconds
  build: 0.001 seconds
  main: 34.172 seconds
  build: 0.0 seconds
  main: 33.161 seconds
  build: 0.001 seconds
  main: 33.109 seconds
TEST RESULT: Passed. Execution successful
--------------------------------------------------
TEST: compiler/loopopts/superword/SumRed_Int.java
  build: 0.054 seconds
  compile: 0.054 seconds
  main: 30.109 seconds
  build: 0.0 seconds
  main: 30.019 seconds
  build: 0.0 seconds
  main: 28.672 seconds
  build: 0.001 seconds
  main: 28.526 seconds
  build: 0.001 seconds
  main: 33.196 seconds
  build: 0.001 seconds
  main: 33.239 seconds
  build: 0.0 seconds
  main: 33.683 seconds
  build: 0.0 seconds
  main: 33.746 seconds
TEST RESULT: Passed. Execution successful
--------------------------------------------------
TEST: compiler/loopopts/superword/SumRed_Long.java
  build: 0.051 seconds
  compile: 0.05 seconds
  main: 32.341 seconds
  build: 0.0 seconds
  main: 32.196 seconds
  build: 0.001 seconds
  main: 34.058 seconds
  build: 0.0 seconds
  main: 34.076 seconds
TEST RESULT: Passed. Execution successful