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| author | Wilco Dijkstra <wilco.dijkstra@arm.com> | 2024-04-17 17:18:23 +0100 |
|---|---|---|
| committer | Wilco Dijkstra <wilco.dijkstra@arm.com> | 2024-05-20 16:06:38 +0100 |
| commit | e14c673ea9ab2eca5de4db91b478f0b5297ef321 (patch) | |
| tree | b61170f0c458a7e4dcf25940776859f0766ebe25 | |
| parent | 804fa0bb92f8073394b3859edb810c3e23375530 (diff) | |
| download | gcc-e14c673ea9ab2eca5de4db91b478f0b5297ef321.zip gcc-e14c673ea9ab2eca5de4db91b478f0b5297ef321.tar.gz gcc-e14c673ea9ab2eca5de4db91b478f0b5297ef321.tar.bz2 | |
AArch64: Improve costing of ctz
Improve costing of ctz - both TARGET_CSSC and vector cases were not handled yet.
gcc:
* config/aarch64/aarch64.cc (aarch64_rtx_costs): Improve CTZ costing.
| -rw-r--r-- | gcc/config/aarch64/aarch64.cc | 22 |
1 files changed, 18 insertions, 4 deletions
diff --git a/gcc/config/aarch64/aarch64.cc b/gcc/config/aarch64/aarch64.cc index 662ff5a..ee12d88 100644 --- a/gcc/config/aarch64/aarch64.cc +++ b/gcc/config/aarch64/aarch64.cc @@ -14349,10 +14349,24 @@ aarch64_rtx_costs (rtx x, machine_mode mode, int outer ATTRIBUTE_UNUSED, return false; case CTZ: - *cost = COSTS_N_INSNS (2); - - if (speed) - *cost += extra_cost->alu.clz + extra_cost->alu.rev; + if (VECTOR_MODE_P (mode)) + { + *cost = COSTS_N_INSNS (3); + if (speed) + *cost += extra_cost->vect.alu * 3; + } + else if (TARGET_CSSC) + { + *cost = COSTS_N_INSNS (1); + if (speed) + *cost += extra_cost->alu.clz; + } + else + { + *cost = COSTS_N_INSNS (2); + if (speed) + *cost += extra_cost->alu.clz + extra_cost->alu.rev; + } return false; case COMPARE: |