fallback: legalize: G_FPTRUNC s16,s64

Run:explore-04ca53e65f-20261014-114124
Kind:fallback
Category:legalize: G_FPTRUNC s16,s64
Occurrences:33 in 21 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 04ca53e65f
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 (33):

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.2ef695f3e4.ll (mutant of copysign-casts.ll)fold_demote_h_d-mtriple=riscv32 -verify-machineinstrs -mattr=+f -mattr=+zfhmin -target-abi ilp32f
copysign-casts.5888be1086.ll (mutant of copysign-casts.ll)fold_demote_h_d-mtriple=riscv32 -verify-machineinstrs -mattr=+f -mattr=+zfh -target-abi ilp32f
copysign-casts.7bf5b7dde9.ll (mutant of copysign-casts.ll)fold_demote_h_d-mtriple=riscv64 -verify-machineinstrs
copysign-casts.831a187dd9.ll (mutant of copysign-casts.ll)fold_demote_h_d-mtriple=riscv32 -verify-machineinstrs
copysign-casts.852e62f77e.ll (mutant of copysign-casts.ll)fold_demote_h_d-mtriple=riscv32 -verify-machineinstrs -mattr=+f -target-abi ilp32f
copysign-casts.981d8de5cf.ll (mutant of copysign-casts.ll)fold_demote_h_d-mtriple=riscv32 -verify-machineinstrs -mattr=+zdinx -target-abi ilp32
copysign-casts.a74e7f5ca2.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.cfd79953f7.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.e05a042155.ll (mutant of copysign-casts.ll)fold_demote_h_d-mtriple=riscv64 -verify-machineinstrs -mattr=+f -mattr=+d -target-abi lp64d
copysign-casts.ed31f78218.ll (mutant of copysign-casts.ll)fold_demote_h_d-mtriple=riscv32 -verify-machineinstrs -mattr=+f -mattr=+d -target-abi ilp32d
fp16-promote.683b8ae874.ll (mutant of fp16-promote.ll)test_fptrunc_double-mtriple=riscv32 -mattr +d -target-abi ilp32d

Generated 2026-10-15 08:05 UTC.