fallback: legalize: G

fallback: legalize: G_FMAXIMUM s64

Run:	explore-04ca53e65f-20261014-114124
Kind:	fallback
Category:	legalize: G_FMAXIMUM s64
Occurrences:	16 in 4 configs, 1 test files
Snippet from:	double-maximum-minimum.ll @fmaximum_f64 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 double @fmaximum_f64(double %a, double %b) #0 {
  %1 = call double @llvm.maximum.f64(double %a, double %b)
  ret double %1
}

; Function Attrs: nocallback nocreateundeforpoison nofree nosync nounwind speculatable willreturn memory(none)
declare double @llvm.maximum.f64(double, double) #1

attributes #0 = { nounwind }
attributes #1 = { nocallback nocreateundeforpoison nofree nosync nounwind speculatable willreturn memory(none) }

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 legalize instruction: %2:_(s64) = G_FMAXIMUM %0:_, %1:_ (in function: fmaximum_f64)
warning: Instruction selection used fallback path for fmaximum_f64

Occurrences (16):

Input	Function	Config
double-maximum-minimum.ll	fmaximum_f64	`-mtriple=riscv32 -mattr=+d -verify-machineinstrs -target-abi=ilp32d`
double-maximum-minimum.ll	fmaximum_nnan_op_f64	`-mtriple=riscv32 -mattr=+d -verify-machineinstrs -target-abi=ilp32d`
double-maximum-minimum.ll	fmaximum_f64	`-mtriple=riscv32 -mattr=+zdinx -verify-machineinstrs -target-abi=ilp32`
double-maximum-minimum.ll	fmaximum_nnan_op_f64	`-mtriple=riscv32 -mattr=+zdinx -verify-machineinstrs -target-abi=ilp32`
double-maximum-minimum.ll	fmaximum_f64	`-mtriple=riscv64 -mattr=+d -verify-machineinstrs -target-abi=lp64d`
double-maximum-minimum.ll	fmaximum_nnan_op_f64	`-mtriple=riscv64 -mattr=+d -verify-machineinstrs -target-abi=lp64d`
double-maximum-minimum.ll	fmaximum_f64	`-mtriple=riscv64 -mattr=+zdinx -verify-machineinstrs -target-abi=lp64`
double-maximum-minimum.ll	fmaximum_nnan_op_f64	`-mtriple=riscv64 -mattr=+zdinx -verify-machineinstrs -target-abi=lp64`
double-maximum-minimum.262365057e.ll (mutant of double-maximum-minimum.ll)	fmaximum_f64	`-mtriple=riscv32 -mattr=+zdinx -verify-machineinstrs -target-abi=ilp32`
double-maximum-minimum.48f7033ab3.ll (mutant of double-maximum-minimum.ll)	fmaximum_nnan_op_f64	`-mtriple=riscv64 -mattr=+zdinx -verify-machineinstrs -target-abi=lp64`
double-maximum-minimum.8a9e46a32d.ll (mutant of double-maximum-minimum.ll)	fmaximum_f64	`-mtriple=riscv64 -mattr=+zdinx -verify-machineinstrs -target-abi=lp64`
double-maximum-minimum.8c3bc9455a.ll (mutant of double-maximum-minimum.ll)	fmaximum_nnan_op_f64	`-mtriple=riscv32 -mattr=+zdinx -verify-machineinstrs -target-abi=ilp32`
double-maximum-minimum.aa24d404b5.ll (mutant of double-maximum-minimum.ll)	fmaximum_nnan_op_f64	`-mtriple=riscv32 -mattr=+d -verify-machineinstrs -target-abi=ilp32d`
double-maximum-minimum.cc977b7e62.ll (mutant of double-maximum-minimum.ll)	fmaximum_f64	`-mtriple=riscv32 -mattr=+d -verify-machineinstrs -target-abi=ilp32d`
double-maximum-minimum.f1e2032058.ll (mutant of double-maximum-minimum.ll)	fmaximum_f64	`-mtriple=riscv64 -mattr=+d -verify-machineinstrs -target-abi=lp64d`
double-maximum-minimum.f42cc2c4c4.ll (mutant of double-maximum-minimum.ll)	fmaximum_nnan_op_f64	`-mtriple=riscv64 -mattr=+d -verify-machineinstrs -target-abi=lp64d`

Generated 2026-10-15 08:05 UTC.