fallback: legalize: G_FCANONICALIZE s32

Run:	main-04ca53e65f-20261014-113325
Kind:	fallback
Category:	legalize: G_FCANONICALIZE s32
Occurrences:	32 in 11 configs, 2 test files
Snippet from:	fp-fcanonicalize.ll @fcanonicalize_f32 via llvm-extract
Config:	`--mtriple=riscv32`
Local check:	reproduces at 04ca53e65f
Compiler Explorer:	not uploaded (over --godbolt-limit or disabled)

Snippet:

define float @fcanonicalize_f32(float %x) {
  %z = call nnan float @llvm.canonicalize.f32(float %x)
  ret float %z
}

; Function Attrs: nocallback nocreateundeforpoison nofree nosync nounwind speculatable willreturn memory(none)
declare float @llvm.canonicalize.f32(float) #0

attributes #0 = { nocallback nocreateundeforpoison nofree nosync nounwind speculatable willreturn memory(none) }

Reproduce:

llc --mtriple=riscv32 -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc --mtriple=riscv32 -global-isel=0 snippet.ll -o -

Local llc output:

remark: <unknown>:0:0: unable to legalize instruction: %1:_(s32) = nnan G_FCANONICALIZE %0:_ (in function: fcanonicalize_f32)
warning: Instruction selection used fallback path for fcanonicalize_f32

Occurrences (32):

Input	Function	Config
float-arith.ll	fmsub_s	`-mtriple=riscv32 -verify-machineinstrs`
float-arith.ll	fnmadd_s	`-mtriple=riscv32 -verify-machineinstrs`
float-arith.ll	fnmadd_s_2	`-mtriple=riscv32 -verify-machineinstrs`
float-arith.ll	fnmsub_s	`-mtriple=riscv32 -verify-machineinstrs`
float-arith.ll	fnmsub_s_2	`-mtriple=riscv32 -verify-machineinstrs`
float-arith.ll	fmsub_s	`-mtriple=riscv64 -verify-machineinstrs`
float-arith.ll	fnmadd_s	`-mtriple=riscv64 -verify-machineinstrs`
float-arith.ll	fnmadd_s_2	`-mtriple=riscv64 -verify-machineinstrs`
float-arith.ll	fnmsub_s	`-mtriple=riscv64 -verify-machineinstrs`
float-arith.ll	fnmsub_s_2	`-mtriple=riscv64 -verify-machineinstrs`
fp-fcanonicalize.ll	fcanonicalize_f32	`--mtriple=riscv32`
fp-fcanonicalize.ll	fcanonicalize_f32	`--mtriple=riscv64`
fp-fcanonicalize.ll	fcanonicalize_f32	`-mtriple=riscv32 -mattr=+zfinx -verify-machineinstrs`
fp-fcanonicalize.ll	fcanonicalize_f32	`-mtriple=riscv32 -mattr=+zhinx -target-abi=ilp32 -verify-machineinstrs`
fp-fcanonicalize.ll	fcanonicalize_f32	`-mtriple=riscv64 -mattr=+zdinx -verify-machineinstrs`
fp-fcanonicalize.ll	fcanonicalize_f32	`-mtriple=riscv64 -mattr=+zfinx -verify-machineinstrs`
fp-fcanonicalize.ll	fcanonicalize_f32	`-mtriple=riscv64 -mattr=+zhinx -verify-machineinstrs`
float-arith.3f5d151b15.ll (mutant of float-arith.ll)	fnmadd_s	`-mtriple=riscv32 -mattr=+zfinx -verify-machineinstrs -target-abi=ilp32`
float-arith.5bae4c1caa.ll (mutant of float-arith.ll)	fnmadd_s	`-mtriple=riscv64 -verify-machineinstrs`
float-arith.5bae4c1caa.ll (mutant of float-arith.ll)	fnmsub_s_2	`-mtriple=riscv64 -verify-machineinstrs`
float-arith.c3ef1bc760.ll (mutant of float-arith.ll)	fnmadd_s	`-mtriple=riscv64 -mattr=+zfinx -verify-machineinstrs -target-abi=lp64`
float-arith.cbf3773989.ll (mutant of float-arith.ll)	fnmadd_s	`-mtriple=riscv32 -verify-machineinstrs`
float-arith.de81a71928.ll (mutant of float-arith.ll)	fnmadd_s	`-mtriple=riscv32 -verify-machineinstrs`
float-arith.de81a71928.ll (mutant of float-arith.ll)	fnmsub_s_2	`-mtriple=riscv32 -verify-machineinstrs`
float-arith.e46b139d97.ll (mutant of float-arith.ll)	fnmadd_s	`-mtriple=riscv64 -verify-machineinstrs`
fp-fcanonicalize.5654e6f187.ll (mutant of fp-fcanonicalize.ll)	fcanonicalize_f32	`-mtriple=riscv64 -mattr=+zfinx -verify-machineinstrs`
fp-fcanonicalize.71d4146af4.ll (mutant of fp-fcanonicalize.ll)	fcanonicalize_f32	`--mtriple=riscv64`
fp-fcanonicalize.b1a65c4a7b.ll (mutant of fp-fcanonicalize.ll)	fcanonicalize_f32	`-mtriple=riscv32 -mattr=+zfinx -verify-machineinstrs`
fp-fcanonicalize.b3304d16aa.ll (mutant of fp-fcanonicalize.ll)	fcanonicalize_f32	`--mtriple=riscv32`
fp-fcanonicalize.d473adaf78.ll (mutant of fp-fcanonicalize.ll)	fcanonicalize_f32	`-mtriple=riscv64 -mattr=+zhinx -verify-machineinstrs`
fp-fcanonicalize.df807b984e.ll (mutant of fp-fcanonicalize.ll)	fcanonicalize_f32	`-mtriple=riscv32 -mattr=+zhinx -target-abi=ilp32 -verify-machineinstrs`
fp-fcanonicalize.f54a6b6199.ll (mutant of fp-fcanonicalize.ll)	fcanonicalize_f32	`-mtriple=riscv64 -mattr=+zdinx -verify-machineinstrs`

Generated 2026-10-15 08:05 UTC.