Split fnmadd_b15, fmadd_b15, fmsub_b15, and fnmsub_b15 in rv32i_m

[UmerShahidengr]

Description

This PR is the continuation of PR#461. In PR#461, fnmadd_b15, fmadd_b15, fmsub_b15, and fnmsub_b15 tests were split into 300 test files each, now these tests have been re-merged and split into 50 tests using this script. Each splited test has 768 tests (1286), and adding 1538 signature entries (2 entries per test, 768 tests implies 7682=1538 entries). Sail log file per test is now 2.1MB and consists of ~96k lines. Each split-test has been saved into a separate directory to make it easier to access and run.

Ratified/Unratified Extensions

• Ratified
• Unratified

List Extensions

RV32IF_Zicsr,RV32IFD_Zicsr,RV64IF_Zicsr,RV64IFD_Zicsr,RV32EF_Zicsr,RV32EFD_Zicsr,RV64EF_Zicsr,RV64EFD_Zicsr

Reference Model Used

• SAIL
• Spike
• Other - < SPECIFY HERE >

Mandatory Checklist:

• All tests are compliant with the test-format spec present in this repo ?
• Ran the new tests on RISCOF with SAIL/Spike as reference model successfully ?
• Ran the new tests on RISCOF in coverage mode
• Link to Google-Drive folder containing the new coverage reports (See this for more info): < SPECIFY HERE >
• Link to PR in RISCV-ISAC from which the reports were generated : < SPECIFY HERE >
• Changelog entry created with a minor patch

[allenjbaum]

I see only files being deleted; I see nothing being added. What am I missing here?