fallback: legalize: G_SDIV <2 x s64>

Run:main-04ca53e65f-20261014-105623
Kind:fallback
Category:legalize: G_SDIV <2 x s64> NEW
Occurrences:3 in 3 configs, 1 test files
Snippet from:rv32zbs.075e70aec0.ll (mutant of rv32zbs.ll) @icmp_eq_nonpow2 via llvm-extract
Config:-mtriple=riscv32 -mattr=+zbs -verify-machineinstrs
Local check:reproduces at 04ca53e65f
Compiler Explorer:not uploaded (over --godbolt-limit or disabled)

Snippet:

@G = external global <2 x i64>
@G.1 = external global <2 x i64>

; Function Attrs: nounwind
define i1 @icmp_eq_nonpow2(i32 %x) #0 {
  %A = alloca <2 x i64>, align 16
  store <2 x i64> poison, ptr %A, align 16
  %LGV1 = load <2 x i64>, ptr @G.1, align 16
  %LGV = load <2 x i64>, ptr @G, align 16
  %cmp = icmp eq i32 %x, 32767
  %B = sdiv <2 x i64> %LGV, %LGV1
  store <2 x i64> %B, ptr %A, align 16
  ret i1 %cmp
}

attributes #0 = { nounwind }

Reproduce:

llc -mtriple=riscv32 -mattr=+zbs -verify-machineinstrs -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc -mtriple=riscv32 -mattr=+zbs -verify-machineinstrs -global-isel=0 snippet.ll -o -

Local llc output:

remark: <unknown>:0:0: unable to legalize instruction: %9:_(<2 x s64>) = G_SDIV %5:_, %3:_ (in function: icmp_eq_nonpow2)
warning: Instruction selection used fallback path for icmp_eq_nonpow2

Occurrences (3):

InputFunctionConfig
rv32zbs.075e70aec0.ll (mutant of rv32zbs.ll)icmp_eq_nonpow2-mtriple=riscv32 -mattr=+zbs -verify-machineinstrs
rv32zbs.997675a424.ll (mutant of rv32zbs.ll)icmp_eq_nonpow2-mtriple=riscv32 -mattr=+zbs,+zbb -verify-machineinstrs
rv32zbs.e4c25c0e44.ll (mutant of rv32zbs.ll)icmp_eq_nonpow2-mtriple=riscv32 -verify-machineinstrs

Generated 2026-10-15 08:05 UTC.