[riscv-port] RFR: 8281967: riscv: Intrinsify bigIntegerLeftShift [v2]
Taiping Guo
tguo at openjdk.java.net
Tue Mar 1 01:42:12 UTC 2022
> BigInteger intrinsic: bigIntegerLeftShift intrinsic is missed in current vm. It should be implemented.
> Since that there is no hardware that supports rvv1.0 for now, I used `test/jdk/java/math/BigInteger/ModPow.java` testcase to compare the number of instructions executed with and without intrinsic. The number of instructions executed for the method `shiftLeftImplWorker` compiled by C2 without intrinsic is about 9.2x ( vlen=256 ) that of version with intrinsic.
>
> Full jtreg tests on qemu are passed without new failures.
Taiping Guo has updated the pull request incrementally with one additional commit since the last revision:
call shadd for shift+add
-------------
Changes:
- all: https://git.openjdk.java.net/riscv-port/pull/61/files
- new: https://git.openjdk.java.net/riscv-port/pull/61/files/c3f6020d..10e04ab7
Webrevs:
- full: https://webrevs.openjdk.java.net/?repo=riscv-port&pr=61&range=01
- incr: https://webrevs.openjdk.java.net/?repo=riscv-port&pr=61&range=00-01
Stats: 10 lines in 1 file changed: 0 ins; 6 del; 4 mod
Patch: https://git.openjdk.java.net/riscv-port/pull/61.diff
Fetch: git fetch https://git.openjdk.java.net/riscv-port pull/61/head:pull/61
PR: https://git.openjdk.java.net/riscv-port/pull/61
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