fallback: legalize: G_INTRINSIC <2 x s32>,<4 x s16>

Snippet:

define <2 x i32> @test_pmqacc_h00_i32x2(<2 x i32> %rd, <4 x i16> %a, <4 x i16> %b) {
  %r = call <2 x i32> @llvm.riscv.pmqacc.h00.v2i32.v4i16(<2 x i32> %rd, <4 x i16> %a, <4 x i16> %b)
  ret <2 x i32> %r
}

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare <2 x i32> @llvm.riscv.pmqacc.h00.v2i32.v4i16(<2 x i32>, <4 x i16>, <4 x i16>) #0

attributes #0 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }

Reproduce:

llc -mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc -mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs -global-isel=0 snippet.ll -o -

Local llc output:

remark: <unknown>:0:0: unable to legalize instruction: %3:_(<2 x s32>) = G_INTRINSIC intrinsic(@llvm.riscv.pmqacc.h00), %0:_(<2 x s32>), %1:_(<4 x s16>), %2:_(<4 x s16>) (in function: test_pmqacc_h00_i32x2)
warning: Instruction selection used fallback path for test_pmqacc_h00_i32x2

Occurrences (42):

Generated 2026-10-15 08:05 UTC.