fallback: legalize: G_SITOFP s128,s64

Run:explore-04ca53e65f-20261014-114124
Kind:fallback
Category:legalize: G_SITOFP s128,s64
Occurrences:16 in 10 configs, 2 test files
Snippet from:calling-conv-ilp32e.ll @caller_mixed_scalar_libcalls via llvm-extract
Config:-mtriple=riscv32 -target-abi ilp32e -frame-pointer=all -verify-machineinstrs
Local check:reproduces at 04ca53e65f
Compiler Explorer:not uploaded (over --godbolt-limit or disabled)

Snippet:

define i32 @caller_mixed_scalar_libcalls(i64 %a) {
  %1 = sitofp i64 %a to fp128
  %2 = bitcast fp128 %1 to i128
  %3 = trunc i128 %2 to i32
  ret i32 %3
}

Reproduce:

llc -mtriple=riscv32 -target-abi ilp32e -frame-pointer=all -verify-machineinstrs -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc -mtriple=riscv32 -target-abi ilp32e -frame-pointer=all -verify-machineinstrs -global-isel=0 snippet.ll -o -

Local llc output:

remark: <unknown>:0:0: unable to legalize instruction: %3:_(s128) = G_SITOFP %0:_(s64) (in function: caller_mixed_scalar_libcalls)
warning: Instruction selection used fallback path for caller_mixed_scalar_libcalls

Occurrences (16):

InputFunctionConfig
calling-conv-ilp32-ilp32f-ilp32d-common.llcaller_mixed_scalar_libcalls-mtriple=riscv32 -mattr=+d -target-abi ilp32d -verify-machineinstrs
calling-conv-ilp32-ilp32f-ilp32d-common.llcaller_mixed_scalar_libcalls-mtriple=riscv32 -mattr=+f -target-abi ilp32f -verify-machineinstrs
calling-conv-ilp32-ilp32f-ilp32d-common.llcaller_mixed_scalar_libcalls-mtriple=riscv32 -verify-machineinstrs
calling-conv-ilp32-ilp32f-ilp32d-common.llcaller_mixed_scalar_libcalls-mtriple=riscv32 -verify-machineinstrs -frame-pointer=all
calling-conv-ilp32-ilp32f-ilp32d-common.llcaller_mixed_scalar_libcalls-mtriple=riscv32 -verify-machineinstrs -frame-pointer=all -mattr=+d -target-abi ilp32d
calling-conv-ilp32-ilp32f-ilp32d-common.llcaller_mixed_scalar_libcalls-mtriple=riscv32 -verify-machineinstrs -frame-pointer=all -mattr=+f -target-abi ilp32f
calling-conv-ilp32e.llcaller_mixed_scalar_libcalls-mtriple=riscv32 -target-abi ilp32e -frame-pointer=all -verify-machineinstrs
calling-conv-ilp32e.llcaller_mixed_scalar_libcalls-mtriple=riscv32 -target-abi ilp32e -mattr=+save-restore -frame-pointer=all -verify-machineinstrs
calling-conv-ilp32e.llcaller_mixed_scalar_libcalls-mtriple=riscv32 -target-abi ilp32e -mattr=+save-restore -verify-machineinstrs
calling-conv-ilp32e.llcaller_mixed_scalar_libcalls-mtriple=riscv32 -target-abi ilp32e -verify-machineinstrs
calling-conv-ilp32-ilp32f-ilp32d-common.4bbaf3c2f9.ll (mutant of calling-conv-ilp32-ilp32f-ilp32d-common.ll)caller_mixed_scalar_libcalls-mtriple=riscv32 -verify-machineinstrs
calling-conv-ilp32-ilp32f-ilp32d-common.807a3004f5.ll (mutant of calling-conv-ilp32-ilp32f-ilp32d-common.ll)caller_mixed_scalar_libcalls-mtriple=riscv32 -mattr=+d -target-abi ilp32d -verify-machineinstrs
calling-conv-ilp32-ilp32f-ilp32d-common.834d5f15f2.ll (mutant of calling-conv-ilp32-ilp32f-ilp32d-common.ll)caller_mixed_scalar_libcalls-mtriple=riscv32 -verify-machineinstrs -frame-pointer=all -mattr=+d -target-abi ilp32d
calling-conv-ilp32-ilp32f-ilp32d-common.85a61e29ed.ll (mutant of calling-conv-ilp32-ilp32f-ilp32d-common.ll)caller_mixed_scalar_libcalls-mtriple=riscv32 -verify-machineinstrs -frame-pointer=all -mattr=+f -target-abi ilp32f
calling-conv-ilp32-ilp32f-ilp32d-common.aa7954f87b.ll (mutant of calling-conv-ilp32-ilp32f-ilp32d-common.ll)caller_mixed_scalar_libcalls-mtriple=riscv32 -verify-machineinstrs -frame-pointer=all
calling-conv-ilp32-ilp32f-ilp32d-common.cddca2d3e6.ll (mutant of calling-conv-ilp32-ilp32f-ilp32d-common.ll)caller_mixed_scalar_libcalls-mtriple=riscv32 -mattr=+f -target-abi ilp32f -verify-machineinstrs

Generated 2026-10-15 08:05 UTC.