fallback: legalize: G_FPTRUNC s16,s64

Run:explore-bc8218b282-20261015-075519
Kind:fallback
Category:legalize: G_FPTRUNC s16,s64
Occurrences:62 in 30 configs, 3 test files
Snippet from:half-convert.ll @fcvt_h_d via llvm-extract
Config:-mtriple=riscv32 -mattr=+d -target-abi=ilp32 -verify-machineinstrs
Local check:reproduces at bc8218b282
Compiler Explorer:not uploaded (over --godbolt-limit or disabled)

Snippet:

; Function Attrs: nounwind
define half @fcvt_h_d(double %a) #0 {
  %1 = fptrunc double %a to half
  ret half %1
}

attributes #0 = { nounwind }

Reproduce:

llc -mtriple=riscv32 -mattr=+d -target-abi=ilp32 -verify-machineinstrs -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc -mtriple=riscv32 -mattr=+d -target-abi=ilp32 -verify-machineinstrs -global-isel=0 snippet.ll -o -

Local llc output:

remark: <unknown>:0:0: unable to legalize instruction: %3:_(s16) = G_FPTRUNC %0:_(s64) (in function: fcvt_h_d)
warning: Instruction selection used fallback path for fcvt_h_d

Occurrences (62) (first 50):

InputFunctionConfig
copysign-casts.llfold_demote_h_d-mtriple=riscv32 -verify-machineinstrs
copysign-casts.llfold_demote_h_d-mtriple=riscv32 -verify-machineinstrs -mattr=+f -mattr=+d -mattr=+zfhmin -target-abi ilp32d
copysign-casts.llfold_demote_h_d-mtriple=riscv32 -verify-machineinstrs -mattr=+f -mattr=+d -target-abi ilp32d
copysign-casts.llfold_demote_h_d-mtriple=riscv32 -verify-machineinstrs -mattr=+f -mattr=+zfh -target-abi ilp32f
copysign-casts.llfold_demote_h_d-mtriple=riscv32 -verify-machineinstrs -mattr=+f -mattr=+zfhmin -target-abi ilp32f
copysign-casts.llfold_demote_h_d-mtriple=riscv32 -verify-machineinstrs -mattr=+f -target-abi ilp32f
copysign-casts.llfold_demote_h_d-mtriple=riscv64 -verify-machineinstrs
copysign-casts.llfold_demote_h_d-mtriple=riscv64 -verify-machineinstrs -mattr=+f -mattr=+d -mattr=+zfhmin -target-abi lp64d
copysign-casts.llfold_demote_h_d-mtriple=riscv64 -verify-machineinstrs -mattr=+f -mattr=+d -target-abi lp64d
fp16-promote.lltest_fptrunc_double-mtriple=riscv32 -mattr +d -target-abi ilp32d
half-convert.llfcvt_h_d-mtriple=riscv32 -mattr=+d -target-abi=ilp32 -verify-machineinstrs
half-convert.llfcvt_h_d-mtriple=riscv32 -mattr=+d -target-abi=ilp32d -verify-machineinstrs
half-convert.llfcvt_h_d-mtriple=riscv32 -mattr=+d,+zfhmin -verify-machineinstrs -target-abi ilp32d
half-convert.llfcvt_h_d-mtriple=riscv32 -mattr=+zfh -verify-machineinstrs -target-abi ilp32f
half-convert.llfcvt_h_d-mtriple=riscv32 -mattr=+zfhmin -verify-machineinstrs -target-abi ilp32f
half-convert.llfcvt_h_d-mtriple=riscv32 -verify-machineinstrs
half-convert.llfcvt_h_d-mtriple=riscv64 -mattr=+d -target-abi=lp64 -verify-machineinstrs
half-convert.llfcvt_h_d-mtriple=riscv64 -mattr=+d -target-abi=lp64d -verify-machineinstrs
half-convert.llfcvt_h_d-mtriple=riscv64 -mattr=+d,+zfhmin -verify-machineinstrs -target-abi lp64d
half-convert.llfcvt_h_d-mtriple=riscv64 -mattr=+zfh -verify-machineinstrs -target-abi lp64f
half-convert.llfcvt_h_d-mtriple=riscv64 -mattr=+zfhmin -verify-machineinstrs -target-abi lp64f
half-convert.llfcvt_h_d-mtriple=riscv64 -verify-machineinstrs
copysign-casts.074e60bbaa.ll (mutant of copysign-casts.ll)fold_demote_h_d-mtriple=riscv64 -verify-machineinstrs -mattr=+f -mattr=+d -target-abi lp64d
copysign-casts.2d431d7562.ll (mutant of copysign-casts.ll)fold_demote_h_d-mtriple=riscv32 -verify-machineinstrs
copysign-casts.41e1e3cd35.ll (mutant of copysign-casts.ll)fold_demote_h_d-mtriple=riscv32 -verify-machineinstrs -mattr=+f -mattr=+zfh -target-abi ilp32f
copysign-casts.5474bb05d8.ll (mutant of copysign-casts.ll)fold_demote_h_d-mtriple=riscv32 -verify-machineinstrs -mattr=+f -mattr=+zfhmin -target-abi ilp32f
copysign-casts.5602802ca3.ll (mutant of copysign-casts.ll)fold_demote_h_d-mtriple=riscv64 -verify-machineinstrs -mattr=+f -mattr=+d -target-abi lp64d
copysign-casts.5dd9fd42a7.ll (mutant of copysign-casts.ll)fold_demote_h_d-mtriple=riscv64 -verify-machineinstrs -mattr=+f -mattr=+d -mattr=+zfhmin -target-abi lp64d
copysign-casts.60e892da7a.ll (mutant of copysign-casts.ll)fold_demote_h_d-mtriple=riscv64 -verify-machineinstrs
copysign-casts.68e4a974e3.ll (mutant of copysign-casts.ll)fold_demote_h_d-mtriple=riscv64 -verify-machineinstrs
copysign-casts.73442e96d9.ll (mutant of copysign-casts.ll)fold_demote_h_d-mtriple=riscv32 -verify-machineinstrs -mattr=+f -target-abi ilp32f
copysign-casts.8a7749b76a.ll (mutant of copysign-casts.ll)fold_demote_h_d-mtriple=riscv64 -verify-machineinstrs -mattr=+f -mattr=+d -mattr=+zfhmin -target-abi lp64d
copysign-casts.a000a4b300.ll (mutant of copysign-casts.ll)fold_demote_h_d-mtriple=riscv32 -verify-machineinstrs -mattr=+f -mattr=+d -mattr=+zfhmin -target-abi ilp32d
copysign-casts.b280b91443.ll (mutant of copysign-casts.ll)fold_demote_h_d-mtriple=riscv32 -verify-machineinstrs -mattr=+f -mattr=+d -mattr=+zfhmin -target-abi ilp32d
copysign-casts.b2fc3605a9.ll (mutant of copysign-casts.ll)fold_demote_h_d-mtriple=riscv64 -verify-machineinstrs -mattr=+zdinx -target-abi lp64
copysign-casts.bd15eedfb3.ll (mutant of copysign-casts.ll)fold_demote_h_d-mtriple=riscv32 -verify-machineinstrs -mattr=+f -mattr=+d -target-abi ilp32d
copysign-casts.cdaa69b08b.ll (mutant of copysign-casts.ll)fold_demote_h_d-mtriple=riscv32 -verify-machineinstrs -mattr=+f -target-abi ilp32f
copysign-casts.cdc85a58b1.ll (mutant of copysign-casts.ll)fold_demote_h_d-mtriple=riscv32 -verify-machineinstrs -mattr=+f -mattr=+zfhmin -target-abi ilp32f
copysign-casts.ed5887ffbb.ll (mutant of copysign-casts.ll)fold_demote_h_d-mtriple=riscv32 -verify-machineinstrs -mattr=+f -mattr=+zfh -target-abi ilp32f
copysign-casts.eeecf44951.ll (mutant of copysign-casts.ll)fold_demote_h_d-mtriple=riscv32 -verify-machineinstrs -mattr=+f -mattr=+d -target-abi ilp32d
copysign-casts.f43ab355ce.ll (mutant of copysign-casts.ll)fold_demote_h_d-mtriple=riscv32 -verify-machineinstrs
copysign-casts.f968869d70.ll (mutant of copysign-casts.ll)fold_demote_h_d-mtriple=riscv32 -verify-machineinstrs -mattr=+zdinx -target-abi ilp32
half-convert.11fafc3361.ll (mutant of half-convert.ll)fcvt_h_d-mtriple=riscv64 -mattr=+d -target-abi=lp64 -verify-machineinstrs
half-convert.1b610f627d.ll (mutant of half-convert.ll)fcvt_h_d-mtriple=riscv64 -verify-machineinstrs
half-convert.1bc0812a09.ll (mutant of half-convert.ll)fcvt_h_d-mtriple=riscv32 -mattr=+zfh -verify-machineinstrs -target-abi ilp32f
half-convert.31ef69fb7a.ll (mutant of half-convert.ll)fcvt_h_d-mtriple=riscv64 -mattr=+zhinx -verify-machineinstrs -target-abi lp64
half-convert.4235706c5a.ll (mutant of half-convert.ll)fcvt_h_d-mtriple=riscv32 -mattr=+zhinx -verify-machineinstrs -target-abi ilp32
half-convert.4b86cdbc0c.ll (mutant of half-convert.ll)fcvt_h_d-mtriple=riscv64 -mattr=+zhinxmin -verify-machineinstrs -target-abi lp64
half-convert.5137e94b5a.ll (mutant of half-convert.ll)fcvt_h_d-mtriple=riscv64 -mattr=+zdinx,+zhinxmin -verify-machineinstrs -target-abi lp64
half-convert.580171e118.ll (mutant of half-convert.ll)fcvt_h_d-mtriple=riscv64 -mattr=+zfh -verify-machineinstrs -target-abi lp64f

Generated 2026-10-15 08:05 UTC.