fallback: translate: fptrunc float

Run:	main-04ca53e65f-20261014-113325
Kind:	fallback
Category:	translate: fptrunc float
Occurrences:	24 in 18 configs, 4 test files
Snippet from:	xandesbfhcvt.ll @fcvt_bf16_s via llvm-extract
Config:	`-mtriple=riscv32 -mattr=+xandesbfhcvt -target-abi ilp32f -verify-machineinstrs`
Local check:	reproduces at 04ca53e65f
Compiler Explorer:	not uploaded (over --godbolt-limit or disabled)

Snippet:

; Function Attrs: nounwind
define bfloat @fcvt_bf16_s(float %a) #0 {
  %1 = fptrunc float %a to bfloat
  ret bfloat %1
}

attributes #0 = { nounwind }

Reproduce:

llc -mtriple=riscv32 -mattr=+xandesbfhcvt -target-abi ilp32f -verify-machineinstrs -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc -mtriple=riscv32 -mattr=+xandesbfhcvt -target-abi ilp32f -verify-machineinstrs -global-isel=0 snippet.ll -o -

Local llc output:

remark: <unknown>:0:0: unable to translate instruction: fptrunc: '  %1 = fptrunc float %a to bfloat' (in function: fcvt_bf16_s)
warning: Instruction selection used fallback path for fcvt_bf16_s

Occurrences (24):

Input	Function	Config
bf16-promote.ll	test_fptrunc_float	`-mtriple=riscv32 -mattr=+d -target-abi=ilp32d`
bf16-promote.ll	test_fptrunc_float	`-mtriple=riscv64 -mattr=+d -target-abi=lp64d`
bfloat-convert.ll	fcvt_bf16_s	`-mtriple=riscv32 -mattr=+d -verify-machineinstrs -target-abi ilp32d`
bfloat-convert.ll	fcvt_bf16_s	`-mtriple=riscv32 -mattr=+d,+zfbfmin -verify-machineinstrs -target-abi ilp32d`
bfloat-convert.ll	fcvt_bf16_s	`-mtriple=riscv32 -mattr=+zfbfmin -verify-machineinstrs -target-abi ilp32f`
bfloat-convert.ll	fcvt_bf16_s	`-mtriple=riscv64 -mattr=+d -verify-machineinstrs -target-abi lp64d`
bfloat-convert.ll	fcvt_bf16_s	`-mtriple=riscv64 -mattr=+d,+zfbfmin -verify-machineinstrs -target-abi lp64d`
bfloat-convert.ll	fcvt_bf16_s	`-mtriple=riscv64 -mattr=+zfbfmin -verify-machineinstrs -target-abi lp64f`
bfloat.ll	float_to_bfloat	`-mtriple=riscv32 -mattr=+d -target-abi=ilp32 -verify-machineinstrs`
bfloat.ll	float_to_bfloat	`-mtriple=riscv32 -mattr=+d -target-abi=ilp32d -verify-machineinstrs`
bfloat.ll	float_to_bfloat	`-mtriple=riscv32 -verify-machineinstrs`
bfloat.ll	float_to_bfloat	`-mtriple=riscv64 -mattr=+d -target-abi=lp64 -verify-machineinstrs`
bfloat.ll	float_to_bfloat	`-mtriple=riscv64 -mattr=+d -target-abi=lp64d -verify-machineinstrs`
bfloat.ll	float_to_bfloat	`-mtriple=riscv64 -verify-machineinstrs`
xandesbfhcvt.ll	fcvt_bf16_s	`-mtriple=riscv32 -mattr=+xandesbfhcvt -target-abi ilp32f -verify-machineinstrs`
xandesbfhcvt.ll	fcvt_bf16_s	`-mtriple=riscv32 -mattr=+zfh,+xandesbfhcvt -target-abi ilp32f -verify-machineinstrs`
xandesbfhcvt.ll	fcvt_bf16_s	`-mtriple=riscv64 -mattr=+xandesbfhcvt -target-abi lp64f -verify-machineinstrs`
xandesbfhcvt.ll	fcvt_bf16_s	`-mtriple=riscv64 -mattr=+zfh,+xandesbfhcvt -target-abi lp64f -verify-machineinstrs`
bf16-promote.2b3ba0e3d9.ll (mutant of bf16-promote.ll)	test_fptrunc_float	`-mtriple=riscv64 -mattr=+d -target-abi=lp64d`
bf16-promote.65aac7c3b1.ll (mutant of bf16-promote.ll)	test_fptrunc_float	`-mtriple=riscv32 -mattr=+d -target-abi=ilp32d`
xandesbfhcvt.17c3aed0df.ll (mutant of xandesbfhcvt.ll)	fcvt_bf16_s	`-mtriple=riscv32 -mattr=+xandesbfhcvt -target-abi ilp32f -verify-machineinstrs`
xandesbfhcvt.9e0abce959.ll (mutant of xandesbfhcvt.ll)	fcvt_bf16_s	`-mtriple=riscv64 -mattr=+xandesbfhcvt -target-abi lp64f -verify-machineinstrs`
xandesbfhcvt.b3abc5fb1b.ll (mutant of xandesbfhcvt.ll)	fcvt_bf16_s	`-mtriple=riscv64 -mattr=+zfh,+xandesbfhcvt -target-abi lp64f -verify-machineinstrs`
xandesbfhcvt.c830176ca6.ll (mutant of xandesbfhcvt.ll)	fcvt_bf16_s	`-mtriple=riscv32 -mattr=+zfh,+xandesbfhcvt -target-abi ilp32f -verify-machineinstrs`

Generated 2026-10-15 08:05 UTC.