fallback: legalize: G_FPTRUNC s16,s128

Run:main-04ca53e65f-20261014-105623
Kind:fallback
Category:legalize: G_FPTRUNC s16,s128
Occurrences:28 in 14 configs, 1 test files
Snippet from:half-convert.ll @fcvt_h_q 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 void @fcvt_h_q(fp128 %x, ptr %y) #0 {
  %a = fptrunc fp128 %x to half
  store half %a, ptr %y, align 2
  ret void
}

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:_(s128) (in function: fcvt_h_q)
warning: Instruction selection used fallback path for fcvt_h_q

Occurrences (28):

InputFunctionConfig
half-convert.llfcvt_h_q-mtriple=riscv32 -mattr=+d -target-abi=ilp32 -verify-machineinstrs
half-convert.llfcvt_h_q-mtriple=riscv32 -mattr=+d -target-abi=ilp32d -verify-machineinstrs
half-convert.llfcvt_h_q-mtriple=riscv32 -mattr=+d,+zfh -verify-machineinstrs -target-abi ilp32d
half-convert.llfcvt_h_q-mtriple=riscv32 -mattr=+d,+zfhmin -verify-machineinstrs -target-abi ilp32d
half-convert.llfcvt_h_q-mtriple=riscv32 -mattr=+zfh -verify-machineinstrs -target-abi ilp32f
half-convert.llfcvt_h_q-mtriple=riscv32 -mattr=+zfhmin -verify-machineinstrs -target-abi ilp32f
half-convert.llfcvt_h_q-mtriple=riscv32 -verify-machineinstrs
half-convert.llfcvt_h_q-mtriple=riscv64 -mattr=+d -target-abi=lp64 -verify-machineinstrs
half-convert.llfcvt_h_q-mtriple=riscv64 -mattr=+d -target-abi=lp64d -verify-machineinstrs
half-convert.llfcvt_h_q-mtriple=riscv64 -mattr=+d,+zfh -verify-machineinstrs -target-abi lp64d
half-convert.llfcvt_h_q-mtriple=riscv64 -mattr=+d,+zfhmin -verify-machineinstrs -target-abi lp64d
half-convert.llfcvt_h_q-mtriple=riscv64 -mattr=+zfh -verify-machineinstrs -target-abi lp64f
half-convert.llfcvt_h_q-mtriple=riscv64 -mattr=+zfhmin -verify-machineinstrs -target-abi lp64f
half-convert.llfcvt_h_q-mtriple=riscv64 -verify-machineinstrs
half-convert.1e76f56a77.ll (mutant of half-convert.ll)fcvt_h_q-mtriple=riscv64 -mattr=+d -target-abi=lp64d -verify-machineinstrs
half-convert.2433e733e1.ll (mutant of half-convert.ll)fcvt_h_q-mtriple=riscv32 -mattr=+zfh -verify-machineinstrs -target-abi ilp32f
half-convert.4415e3cbe0.ll (mutant of half-convert.ll)fcvt_h_q-mtriple=riscv64 -mattr=+d,+zfhmin -verify-machineinstrs -target-abi lp64d
half-convert.49e4dcd95d.ll (mutant of half-convert.ll)fcvt_h_q-mtriple=riscv32 -verify-machineinstrs
half-convert.6ea9883821.ll (mutant of half-convert.ll)fcvt_h_q-mtriple=riscv64 -mattr=+d -target-abi=lp64 -verify-machineinstrs
half-convert.8e11f7903d.ll (mutant of half-convert.ll)fcvt_h_q-mtriple=riscv64 -mattr=+zfhmin -verify-machineinstrs -target-abi lp64f
half-convert.9044761186.ll (mutant of half-convert.ll)fcvt_h_q-mtriple=riscv64 -mattr=+zfh -verify-machineinstrs -target-abi lp64f
half-convert.9b166b2bce.ll (mutant of half-convert.ll)fcvt_h_q-mtriple=riscv64 -verify-machineinstrs
half-convert.9d44f7d883.ll (mutant of half-convert.ll)fcvt_h_q-mtriple=riscv32 -mattr=+zfhmin -verify-machineinstrs -target-abi ilp32f
half-convert.b4372f2150.ll (mutant of half-convert.ll)fcvt_h_q-mtriple=riscv64 -mattr=+d,+zfh -verify-machineinstrs -target-abi lp64d
half-convert.b980201751.ll (mutant of half-convert.ll)fcvt_h_q-mtriple=riscv32 -mattr=+d -target-abi=ilp32d -verify-machineinstrs
half-convert.bed9361c2e.ll (mutant of half-convert.ll)fcvt_h_q-mtriple=riscv32 -mattr=+d,+zfh -verify-machineinstrs -target-abi ilp32d
half-convert.c8a70de7e3.ll (mutant of half-convert.ll)fcvt_h_q-mtriple=riscv32 -mattr=+d,+zfhmin -verify-machineinstrs -target-abi ilp32d
half-convert.db08ba4b50.ll (mutant of half-convert.ll)fcvt_h_q-mtriple=riscv32 -mattr=+d -target-abi=ilp32 -verify-machineinstrs

Generated 2026-10-15 08:05 UTC.