fallback: translate: fptrunc double

Run:	main-04ca53e65f-20261014-105623
Kind:	fallback
Category:	translate: fptrunc double
Occurrences:	18 in 14 configs, 3 test files
Snippet from:	bfloat-convert.ll @fcvt_bf16_d via llvm-extract
Config:	`-mtriple=riscv32 -mattr=+d -verify-machineinstrs -target-abi ilp32d`
Local check:	reproduces at 04ca53e65f
Compiler Explorer:	not uploaded (over --godbolt-limit or disabled)

Snippet:

; Function Attrs: nounwind
define bfloat @fcvt_bf16_d(double %a) #0 {
  %1 = fptrunc double %a to bfloat
  ret bfloat %1
}

attributes #0 = { nounwind }

Reproduce:

llc -mtriple=riscv32 -mattr=+d -verify-machineinstrs -target-abi ilp32d -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc -mtriple=riscv32 -mattr=+d -verify-machineinstrs -target-abi ilp32d -global-isel=0 snippet.ll -o -

Local llc output:

remark: <unknown>:0:0: unable to translate instruction: fptrunc: '  %1 = fptrunc double %a to bfloat' (in function: fcvt_bf16_d)
warning: Instruction selection used fallback path for fcvt_bf16_d

Occurrences (18):

Input	Function	Config
bf16-promote.ll	test_fptrunc_double	`-mtriple=riscv32 -mattr=+d -target-abi=ilp32d`
bf16-promote.ll	test_fptrunc_double	`-mtriple=riscv64 -mattr=+d -target-abi=lp64d`
bfloat-convert.ll	fcvt_bf16_d	`-mtriple=riscv32 -mattr=+d -verify-machineinstrs -target-abi ilp32d`
bfloat-convert.ll	fcvt_bf16_d	`-mtriple=riscv32 -mattr=+d,+zfbfmin -verify-machineinstrs -target-abi ilp32d`
bfloat-convert.ll	fcvt_bf16_d	`-mtriple=riscv32 -mattr=+zfbfmin -verify-machineinstrs -target-abi ilp32f`
bfloat-convert.ll	fcvt_bf16_d	`-mtriple=riscv64 -mattr=+d -verify-machineinstrs -target-abi lp64d`
bfloat-convert.ll	fcvt_bf16_d	`-mtriple=riscv64 -mattr=+d,+zfbfmin -verify-machineinstrs -target-abi lp64d`
bfloat-convert.ll	fcvt_bf16_d	`-mtriple=riscv64 -mattr=+zfbfmin -verify-machineinstrs -target-abi lp64f`
bfloat.ll	double_to_bfloat	`-mtriple=riscv32 -mattr=+d -target-abi=ilp32 -verify-machineinstrs`
bfloat.ll	double_to_bfloat	`-mtriple=riscv32 -mattr=+d -target-abi=ilp32d -verify-machineinstrs`
bfloat.ll	double_to_bfloat	`-mtriple=riscv32 -verify-machineinstrs`
bfloat.ll	double_to_bfloat	`-mtriple=riscv64 -mattr=+d -target-abi=lp64 -verify-machineinstrs`
bfloat.ll	double_to_bfloat	`-mtriple=riscv64 -mattr=+d -target-abi=lp64d -verify-machineinstrs`
bfloat.ll	double_to_bfloat	`-mtriple=riscv64 -verify-machineinstrs`
bf16-promote.1206224c4a.ll (mutant of bf16-promote.ll)	test_fptrunc_double	`-mtriple=riscv32 -mattr=+d -target-abi=ilp32d`
bf16-promote.4945c69c68.ll (mutant of bf16-promote.ll)	test_fptrunc_double	`-mtriple=riscv64 -mattr=+d -target-abi=lp64d`
bf16-promote.8b91f67f87.ll (mutant of bf16-promote.ll)	test_fptrunc_double	`-mtriple=riscv32 -mattr=+d -target-abi=ilp32d`
bf16-promote.9833be5952.ll (mutant of bf16-promote.ll)	test_fptrunc_double	`-mtriple=riscv64 -mattr=+d -target-abi=lp64d`

Generated 2026-10-15 08:05 UTC.