fallback: legalize: G_FCANONICALIZE s32

Run:	explore-04ca53e65f-20261014-114124
Kind:	fallback
Category:	legalize: G_FCANONICALIZE s32
Occurrences:	28 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 (28):

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.10bcc0debf.ll (mutant of float-arith.ll)	fmsub_s	`-mtriple=riscv64 -verify-machineinstrs`
float-arith.5a85d49df5.ll (mutant of float-arith.ll)	fmsub_s	`-mtriple=riscv32 -mattr=+zfinx -verify-machineinstrs -target-abi=ilp32`
float-arith.a831cc31c3.ll (mutant of float-arith.ll)	fmsub_s	`-mtriple=riscv32 -verify-machineinstrs`
float-arith.e9dfd21cfb.ll (mutant of float-arith.ll)	fmsub_s	`-mtriple=riscv64 -mattr=+zfinx -verify-machineinstrs -target-abi=lp64`
fp-fcanonicalize.2618247d85.ll (mutant of fp-fcanonicalize.ll)	fcanonicalize_f32	`-mtriple=riscv64 -mattr=+zfinx -verify-machineinstrs`
fp-fcanonicalize.38ff79c14a.ll (mutant of fp-fcanonicalize.ll)	fcanonicalize_f32	`-mtriple=riscv64 -mattr=+zdinx -verify-machineinstrs`
fp-fcanonicalize.5de1867197.ll (mutant of fp-fcanonicalize.ll)	fcanonicalize_f32	`-mtriple=riscv64 -mattr=+zhinx -verify-machineinstrs`
fp-fcanonicalize.a73d3ec331.ll (mutant of fp-fcanonicalize.ll)	fcanonicalize_f32	`-mtriple=riscv32 -mattr=+zhinx -target-abi=ilp32 -verify-machineinstrs`
fp-fcanonicalize.e116aa5722.ll (mutant of fp-fcanonicalize.ll)	fcanonicalize_f32	`--mtriple=riscv32`
fp-fcanonicalize.f4033dd9fb.ll (mutant of fp-fcanonicalize.ll)	fcanonicalize_f32	`--mtriple=riscv64`
fp-fcanonicalize.f45e7686da.ll (mutant of fp-fcanonicalize.ll)	fcanonicalize_f32	`-mtriple=riscv32 -mattr=+zfinx -verify-machineinstrs`

Generated 2026-10-15 08:05 UTC.