fallback: select: G_SPLAT_VECTOR <vscale x 2 x s64>,s64

Run:explore-04ca53e65f-20261014-114124
Kind:fallback
Category:select: G_SPLAT_VECTOR <vscale x 2 x s64>,s64 NEW
Occurrences:2 in 2 configs, 1 test files
Snippet from:nontemporal-scalable.444e0302db.ll (mutant of nontemporal-scalable.ll) @test_nontemporal_P1_load_nxv2i64 via llvm-extract
Config:-mtriple=riscv32 -mattr=+zihintntl,+f,+d,+zfh,+v
Local check:reproduces at 04ca53e65f
Compiler Explorer:not uploaded (over --godbolt-limit or disabled)

Snippet:

define <vscale x 2 x i64> @test_nontemporal_P1_load_nxv2i64(ptr %p) {
  %A = alloca <vscale x 2 x i64>, align 16
  store <vscale x 2 x i64> poison, ptr %A, align 16
  %1 = load <vscale x 2 x i64>, ptr %p, align 16, !nontemporal !0, !riscv-nontemporal-domain !1
  %B = sub <vscale x 2 x i64> %1, splat (i64 -9223372036854775808)
  store <vscale x 2 x i64> %B, ptr %A, align 16
  ret <vscale x 2 x i64> %1
}

!0 = !{i32 1}
!1 = !{i32 2}

Reproduce:

llc -mtriple=riscv32 -mattr=+zihintntl,+f,+d,+zfh,+v -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc -mtriple=riscv32 -mattr=+zihintntl,+f,+d,+zfh,+v -global-isel=0 snippet.ll -o -

Local llc output:

remark: <unknown>:0:0: cannot select: %4:vrm2(<vscale x 2 x s64>) = G_SPLAT_VECTOR %6:fprb(s64) (in function: test_nontemporal_P1_load_nxv2i64)
warning: Instruction selection used fallback path for test_nontemporal_P1_load_nxv2i64

Occurrences (2):

InputFunctionConfig
nontemporal-scalable.444e0302db.ll (mutant of nontemporal-scalable.ll)test_nontemporal_P1_load_nxv2i64-mtriple=riscv32 -mattr=+zihintntl,+f,+d,+zfh,+v
nontemporal-scalable.5664244911.ll (mutant of nontemporal-scalable.ll)test_nontemporal_P1_load_nxv2i64-mtriple=riscv64 -mattr=+zihintntl,+f,+d,+zfh,+v

Generated 2026-10-15 08:05 UTC.