fallback: legalize: G_FPTOUI_SAT s128,s64

Run:main-bc8218b282-20261015-074651
Kind:fallback
Category:legalize: G_FPTOUI_SAT s128,s64
Occurrences:11 in 3 configs, 1 test files
Snippet from:rv64-double-convert.ll @fptoui_sat_f64_to_i128 via llvm-extract
Config:-mtriple=riscv64 -mattr=+d -verify-machineinstrs -target-abi=lp64d
Local check:reproduces at bc8218b282
Compiler Explorer:not uploaded (over --godbolt-limit or disabled)

Snippet:

; Function Attrs: nounwind
define i128 @fptoui_sat_f64_to_i128(double %a) #0 {
  %1 = tail call i128 @llvm.fptoui.sat.i128.f64(double %a)
  ret i128 %1
}

; Function Attrs: nocallback nocreateundeforpoison nofree nosync nounwind speculatable willreturn memory(none)
declare i128 @llvm.fptoui.sat.i128.f64(double) #1

attributes #0 = { nounwind }
attributes #1 = { 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: %1:_(s128) = G_FPTOUI_SAT %0:_(s64) (in function: fptoui_sat_f64_to_i128)
warning: Instruction selection used fallback path for fptoui_sat_f64_to_i128

Occurrences (11):

InputFunctionConfig
rv64-double-convert.llfptoui_sat_f64_to_i128-mtriple=riscv64 -mattr=+d -verify-machineinstrs -target-abi=lp64d
rv64-double-convert.llfptoui_sat_f64_to_i128-mtriple=riscv64 -mattr=+zdinx -verify-machineinstrs -target-abi=lp64
rv64-double-convert.llfptoui_sat_f64_to_i128-mtriple=riscv64 -verify-machineinstrs -target-abi=lp64
rv64-double-convert.383c50c99a.ll (mutant of rv64-double-convert.ll)fptoui_sat_f64_to_i128-mtriple=riscv64 -verify-machineinstrs -target-abi=lp64
rv64-double-convert.4362b93e03.ll (mutant of rv64-double-convert.ll)fptoui_sat_f64_to_i128-mtriple=riscv64 -verify-machineinstrs -target-abi=lp64
rv64-double-convert.66599d6876.ll (mutant of rv64-double-convert.ll)fptoui_sat_f64_to_i128-mtriple=riscv64 -mattr=+d -verify-machineinstrs -target-abi=lp64d
rv64-double-convert.8431be87f7.ll (mutant of rv64-double-convert.ll)fptoui_sat_f64_to_i128-mtriple=riscv64 -mattr=+d -verify-machineinstrs -target-abi=lp64d
rv64-double-convert.898b565c4b.ll (mutant of rv64-double-convert.ll)fptoui_sat_f64_to_i128-mtriple=riscv64 -mattr=+zdinx -verify-machineinstrs -target-abi=lp64
rv64-double-convert.98e8349228.ll (mutant of rv64-double-convert.ll)fptoui_sat_f64_to_i128-mtriple=riscv64 -verify-machineinstrs -target-abi=lp64
rv64-double-convert.c3c9e9e43d.ll (mutant of rv64-double-convert.ll)fptoui_sat_f64_to_i128-mtriple=riscv64 -mattr=+zdinx -verify-machineinstrs -target-abi=lp64
rv64-double-convert.e45669f1d3.ll (mutant of rv64-double-convert.ll)fptoui_sat_f64_to_i128-mtriple=riscv64 -mattr=+d -verify-machineinstrs -target-abi=lp64d

Generated 2026-10-15 08:05 UTC.