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authorJeff Law <jlaw@ventanamicro.com>2025-03-16 17:43:48 -0600
committerJeff Law <jlaw@ventanamicro.com>2025-03-16 17:46:00 -0600
commit9d68a2a67351fc5b56262c0028ef8fd1d1466627 (patch)
tree4fa5a630de8e5ee15819e105fbbc6888b326fd8b /gcc/rust/util
parentb2b139ddee763dd5fd71a3368e5e66399e3c52a3 (diff)
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[RISC-V][PR target/116256][V4] Fix minor code quality regression in reassociated arithmetic
Arggh. This time add arguments for rv32. Hand edited the testcase part of the patch, but I think I got it right. One. More. Time. -pedantic-errors this time ;( Adding an explicit -std=gnu23 to shut that up. Part of me wants to know why that's getting added by the pre-commit, but not enough to chase it down. -- This failed pre-commit CI the first time through. The only change is in the return type in the test bool -> _Bool. The patch for target/116256 significantly simplified the condition and, I guess not too surprisingly, exposed a minor code quality regression. Specifically the split part of the define_insn_and_split only splits after reload (because we use a match_scratch). So there's nothing to combine the load-immediate with the subsequent add into an addi when the immediate fits into a simm12 field. This patch adjusts the split code to handle that scenario directly and generate the more efficient code. We can squeeze out the slli in this test with a bit more work, but that's out of scope right now since that isn't a regression. Tested in my tester. Waiting on pre-commit testing to render a verdict. PR target/116256 gcc * config/riscv/riscv.md (reassociation splitters): Do not load the adjusted addend into a register if it fits in a simm12. gcc/testsuite * gcc.target/riscv/pr116256-1.c: New test.
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