fallback: legalize: G_INSERT_VECTOR_ELT <3 x s32>,s32,s64

Snippet:

@G = external global float
@G.1 = external global i64

define <3 x float> @exp10_v3f32(<3 x float> %x) {
  %LGV1 = load i64, ptr @G.1, align 4
  %LGV = load float, ptr @G, align 4
  %r = call <3 x float> @llvm.exp10.v3f32(<3 x float> %x)
  %I = insertelement <3 x float> %x, float %LGV, i64 %LGV1
  store <3 x float> %I, ptr poison, align 16
  ret <3 x float> %r
}

; Function Attrs: nocallback nocreateundeforpoison nofree nosync nounwind speculatable willreturn memory(none)
declare <3 x float> @llvm.exp10.v3f32(<3 x float>) #0

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

Reproduce:

llc -mtriple=riscv64 -mattr=+d -verify-machineinstrs -target-abi=lp64d -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc -mtriple=riscv64 -mattr=+d -verify-machineinstrs -target-abi=lp64d -global-isel=0 snippet.ll -o -

Local llc output:

remark: <unknown>:0:0: unable to legalize instruction: %10:_(<3 x s32>) = G_INSERT_VECTOR_ELT %0:_, %7:_(s32), %5:_(s64) (in function: exp10_v3f32)
warning: Instruction selection used fallback path for exp10_v3f32

Occurrences (1):

Generated 2026-10-15 08:05 UTC.