fallback: legalize: G_FPTRUNC s16,s32

Run:	explore-04ca53e65f-20261014-114124
Kind:	fallback
Category:	legalize: G_FPTRUNC s16,s32
Occurrences:	93 in 50 configs, 13 test files
Snippet from:	half-frem.ll @frem_f16 via llvm-extract
Config:	`-mtriple=riscv32 -mattr=+zfhmin -verify-machineinstrs -target-abi ilp32f`
Local check:	reproduces at 04ca53e65f
Compiler Explorer:	not uploaded (over --godbolt-limit or disabled)

Snippet:

; Function Attrs: nounwind
define half @frem_f16(half %a, half %b) #0 {
  %1 = frem half %a, %b
  ret half %1
}

attributes #0 = { nounwind }

Reproduce:

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

Local llc output:

remark: <unknown>:0:0: unable to legalize instruction: %2:_(s16) = G_FPTRUNC %5:_(s32) (in function: frem_f16)
warning: Instruction selection used fallback path for frem_f16

Occurrences (93) (first 50):

Input	Function	Config
copysign-casts.ll	fold_demote_h_s	`-mtriple=riscv32 -verify-machineinstrs`
copysign-casts.ll	fold_demote_h_s	`-mtriple=riscv32 -verify-machineinstrs -mattr=+f -mattr=+d -mattr=+zfhmin -target-abi ilp32d`
copysign-casts.ll	fold_demote_h_s	`-mtriple=riscv32 -verify-machineinstrs -mattr=+f -mattr=+d -target-abi ilp32d`
copysign-casts.ll	fold_demote_h_s	`-mtriple=riscv32 -verify-machineinstrs -mattr=+f -mattr=+zfhmin -target-abi ilp32f`
copysign-casts.ll	fold_demote_h_s	`-mtriple=riscv32 -verify-machineinstrs -mattr=+f -target-abi ilp32f`
copysign-casts.ll	fold_demote_h_s	`-mtriple=riscv64 -verify-machineinstrs`
copysign-casts.ll	fold_demote_h_s	`-mtriple=riscv64 -verify-machineinstrs -mattr=+f -mattr=+d -mattr=+zfhmin -target-abi lp64d`
copysign-casts.ll	fold_demote_h_s	`-mtriple=riscv64 -verify-machineinstrs -mattr=+f -mattr=+d -target-abi lp64d`
fp16-promote.ll	test_fptrunc_float	`-mtriple=riscv32 -mattr +d -target-abi ilp32d`
half-convert.ll	fcvt_h_s	`-mtriple=riscv32 -mattr=+d -target-abi=ilp32 -verify-machineinstrs`
half-convert.ll	fcvt_h_s	`-mtriple=riscv32 -mattr=+d -target-abi=ilp32d -verify-machineinstrs`
half-convert.ll	fcvt_h_s	`-mtriple=riscv32 -mattr=+d,+zfhmin -verify-machineinstrs -target-abi ilp32d`
half-convert.ll	fcvt_h_s	`-mtriple=riscv32 -mattr=+zfhmin -verify-machineinstrs -target-abi ilp32f`
half-convert.ll	fcvt_h_s	`-mtriple=riscv32 -verify-machineinstrs`
half-convert.ll	fcvt_h_s	`-mtriple=riscv64 -mattr=+d -target-abi=lp64 -verify-machineinstrs`
half-convert.ll	fcvt_h_s	`-mtriple=riscv64 -mattr=+d -target-abi=lp64d -verify-machineinstrs`
half-convert.ll	fcvt_h_s	`-mtriple=riscv64 -mattr=+d,+zfhmin -verify-machineinstrs -target-abi lp64d`
half-convert.ll	fcvt_h_s	`-mtriple=riscv64 -mattr=+zfhmin -verify-machineinstrs -target-abi lp64f`
half-convert.ll	fcvt_h_s	`-mtriple=riscv64 -verify-machineinstrs`
half-frem.ll	frem_f16	`-mtriple=riscv32 -mattr=+zfhmin -verify-machineinstrs -target-abi ilp32f`
half-frem.ll	frem_f16	`-mtriple=riscv32 -mattr=+zhinx -verify-machineinstrs -target-abi ilp32`
half-frem.ll	frem_f16	`-mtriple=riscv32 -mattr=+zhinxmin -verify-machineinstrs -target-abi ilp32`
half-frem.ll	frem_f16	`-mtriple=riscv64 -mattr=+zfhmin -verify-machineinstrs -target-abi lp64f`
half-frem.ll	frem_f16	`-mtriple=riscv64 -mattr=+zhinx -verify-machineinstrs -target-abi lp64`
half-frem.ll	frem_f16	`-mtriple=riscv64 -mattr=+zhinxmin -verify-machineinstrs -target-abi lp64`
copysign-casts.143461804b.ll (mutant of copysign-casts.ll)	fold_demote_h_s	`-mtriple=riscv32 -verify-machineinstrs -mattr=+f -mattr=+d -mattr=+zfhmin -target-abi ilp32d`
copysign-casts.17e6e51441.ll (mutant of copysign-casts.ll)	fold_demote_h_s	`-mtriple=riscv64 -verify-machineinstrs -mattr=+zdinx -target-abi lp64`
copysign-casts.2106af121b.ll (mutant of copysign-casts.ll)	fold_demote_h_s	`-mtriple=riscv64 -verify-machineinstrs -mattr=+f -mattr=+d -mattr=+zfhmin -target-abi lp64d`
copysign-casts.340ee8235c.ll (mutant of copysign-casts.ll)	fold_demote_h_s	`-mtriple=riscv64 -verify-machineinstrs`
copysign-casts.3b40566dc0.ll (mutant of copysign-casts.ll)	fold_demote_h_s	`-mtriple=riscv32 -verify-machineinstrs`
copysign-casts.611dc2575f.ll (mutant of copysign-casts.ll)	fold_demote_h_s	`-mtriple=riscv32 -verify-machineinstrs -mattr=+f -target-abi ilp32f`
copysign-casts.b848dff916.ll (mutant of copysign-casts.ll)	fold_demote_h_s	`-mtriple=riscv32 -verify-machineinstrs -mattr=+f -mattr=+zfhmin -target-abi ilp32f`
copysign-casts.dca54a1ed9.ll (mutant of copysign-casts.ll)	fold_demote_h_s	`-mtriple=riscv32 -verify-machineinstrs -mattr=+f -mattr=+d -target-abi ilp32d`
copysign-casts.fbcd9a2606.ll (mutant of copysign-casts.ll)	fold_demote_h_s	`-mtriple=riscv32 -verify-machineinstrs -mattr=+zdinx -target-abi ilp32`
copysign-casts.ff72e1350e.ll (mutant of copysign-casts.ll)	fold_demote_h_s	`-mtriple=riscv64 -verify-machineinstrs -mattr=+f -mattr=+d -target-abi lp64d`
half-br-fcmp.39676bd3c7.ll (mutant of half-br-fcmp.ll)	br_fcmp_one	`-mtriple=riscv64 -mattr=+zfhmin -verify-machineinstrs -target-abi lp64f`
half-br-fcmp.50b81a5082.ll (mutant of half-br-fcmp.ll)	br_fcmp_one	`-mtriple=riscv32 -mattr=+zfhmin -verify-machineinstrs -target-abi ilp32f`
half-fcmp.19c4012bf4.ll (mutant of half-fcmp.ll)	fcmp_ord	`-mtriple=riscv64 -mattr=+zfhmin -verify-machineinstrs -target-abi lp64f`
half-fcmp.1d13d88fd0.ll (mutant of half-fcmp.ll)	fcmp_ord	`-mtriple=riscv32 -mattr=+zfhmin -verify-machineinstrs -target-abi ilp32`
half-fcmp.56e3f754b9.ll (mutant of half-fcmp.ll)	fcmp_ord	`-mtriple=riscv32 -mattr=+zfhmin -verify-machineinstrs -target-abi ilp32f`
half-fcmp.97db222d68.ll (mutant of half-fcmp.ll)	fcmp_ord	`-mtriple=riscv64 -mattr=+zfhmin -verify-machineinstrs -target-abi lp64`
half-frem.20573fac36.ll (mutant of half-frem.ll)	frem_f16	`-mtriple=riscv64 -mattr=+zfhmin -verify-machineinstrs -target-abi lp64f`
half-frem.39f7f08204.ll (mutant of half-frem.ll)	frem_f16	`-mtriple=riscv32 -mattr=+zhinxmin -verify-machineinstrs -target-abi ilp32`
half-frem.4331a35ba5.ll (mutant of half-frem.ll)	frem_f16	`-mtriple=riscv32 -mattr=+zhinx -verify-machineinstrs -target-abi ilp32`
half-frem.466132f6a1.ll (mutant of half-frem.ll)	frem_f16	`-mtriple=riscv32 -mattr=+zhinx -verify-machineinstrs -target-abi ilp32`
half-frem.5215f7077c.ll (mutant of half-frem.ll)	frem_f16	`-mtriple=riscv64 -mattr=+zhinxmin -verify-machineinstrs -target-abi lp64`
half-frem.56b6c34c26.ll (mutant of half-frem.ll)	frem_f16	`-mtriple=riscv64 -mattr=+zfhmin -verify-machineinstrs -target-abi lp64f`
half-frem.627d0682ab.ll (mutant of half-frem.ll)	frem_f16	`-mtriple=riscv64 -mattr=+zfhmin -verify-machineinstrs -target-abi lp64f`
half-frem.6c7b5b5f17.ll (mutant of half-frem.ll)	frem_f16	`-mtriple=riscv64 -mattr=+zhinx -verify-machineinstrs -target-abi lp64`
half-frem.7b60dfd5b6.ll (mutant of half-frem.ll)	frem_f16	`-mtriple=riscv32 -mattr=+zfhmin -verify-machineinstrs -target-abi ilp32f`

Generated 2026-10-15 08:05 UTC.