fallback: legalize: G

fallback: legalize: G_VAARG s32,p0

Run:	explore-bc8218b282-20261015-075519
Kind:	fallback
Category:	legalize: G_VAARG s32,p0
Occurrences:	48 in 6 configs, 1 test files
Snippet from:	vararg.ll @va1_va_arg via llvm-extract
Config:	`-mtriple=riscv64 -mattr=+d -target-abi lp64d -verify-machineinstrs`
Local check:	reproduces at bc8218b282
Compiler Explorer:	not uploaded (over --godbolt-limit or disabled)

Snippet:

; Function Attrs: nounwind
define i32 @va1_va_arg(ptr %fmt, ...) #0 {
  %va = alloca ptr, align 8
  call void @llvm.va_start.p0(ptr %va)
  %1 = va_arg ptr %va, i32
  call void @llvm.va_end.p0(ptr %va)
  ret i32 %1
}

; Function Attrs: nocallback nofree nosync nounwind willreturn
declare void @llvm.va_end.p0(ptr) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn
declare void @llvm.va_start.p0(ptr) #1

attributes #0 = { nounwind }
attributes #1 = { nocallback nofree nosync nounwind willreturn }

Reproduce:

llc -mtriple=riscv64 -mattr=+d -target-abi lp64d -verify-machineinstrs -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc -mtriple=riscv64 -mattr=+d -target-abi lp64d -verify-machineinstrs -global-isel=0 snippet.ll -o -

Local llc output:

remark: <unknown>:0:0: unable to legalize instruction: %18:_(s32) = G_VAARG %17:_(p0), 4 (in function: va1_va_arg)
warning: Instruction selection used fallback path for va1_va_arg

Occurrences (48):

Input	Function	Config
vararg.ll	va1_va_arg	`-mtriple=riscv64 -mattr=+d -target-abi lp64d -verify-machineinstrs`
vararg.ll	va1_va_arg_alloca	`-mtriple=riscv64 -mattr=+d -target-abi lp64d -verify-machineinstrs`
vararg.ll	va4_va_copy	`-mtriple=riscv64 -mattr=+d -target-abi lp64d -verify-machineinstrs`
vararg.ll	va6_no_fixed_args	`-mtriple=riscv64 -mattr=+d -target-abi lp64d -verify-machineinstrs`
vararg.ll	va1_va_arg	`-mtriple=riscv64 -mattr=+d -target-abi lp64f -verify-machineinstrs`
vararg.ll	va1_va_arg_alloca	`-mtriple=riscv64 -mattr=+d -target-abi lp64f -verify-machineinstrs`
vararg.ll	va4_va_copy	`-mtriple=riscv64 -mattr=+d -target-abi lp64f -verify-machineinstrs`
vararg.ll	va6_no_fixed_args	`-mtriple=riscv64 -mattr=+d -target-abi lp64f -verify-machineinstrs`
vararg.ll	va1_va_arg	`-mtriple=riscv64 -target-abi lp64e -frame-pointer=all -verify-machineinstrs`
vararg.ll	va1_va_arg_alloca	`-mtriple=riscv64 -target-abi lp64e -frame-pointer=all -verify-machineinstrs`
vararg.ll	va4_va_copy	`-mtriple=riscv64 -target-abi lp64e -frame-pointer=all -verify-machineinstrs`
vararg.ll	va6_no_fixed_args	`-mtriple=riscv64 -target-abi lp64e -frame-pointer=all -verify-machineinstrs`
vararg.ll	va1_va_arg	`-mtriple=riscv64 -target-abi lp64e -verify-machineinstrs`
vararg.ll	va1_va_arg_alloca	`-mtriple=riscv64 -target-abi lp64e -verify-machineinstrs`
vararg.ll	va4_va_copy	`-mtriple=riscv64 -target-abi lp64e -verify-machineinstrs`
vararg.ll	va6_no_fixed_args	`-mtriple=riscv64 -target-abi lp64e -verify-machineinstrs`
vararg.ll	va1_va_arg	`-mtriple=riscv64 -verify-machineinstrs`
vararg.ll	va1_va_arg_alloca	`-mtriple=riscv64 -verify-machineinstrs`
vararg.ll	va4_va_copy	`-mtriple=riscv64 -verify-machineinstrs`
vararg.ll	va6_no_fixed_args	`-mtriple=riscv64 -verify-machineinstrs`
vararg.ll	va1_va_arg	`-mtriple=riscv64 -verify-machineinstrs -frame-pointer=all`
vararg.ll	va1_va_arg_alloca	`-mtriple=riscv64 -verify-machineinstrs -frame-pointer=all`
vararg.ll	va4_va_copy	`-mtriple=riscv64 -verify-machineinstrs -frame-pointer=all`
vararg.ll	va6_no_fixed_args	`-mtriple=riscv64 -verify-machineinstrs -frame-pointer=all`
vararg.09bcb4b1b3.ll (mutant of vararg.ll)	va1_va_arg	`-mtriple=riscv64 -mattr=+d -target-abi lp64d -verify-machineinstrs`
vararg.09bcb4b1b3.ll (mutant of vararg.ll)	va1_va_arg_alloca	`-mtriple=riscv64 -mattr=+d -target-abi lp64d -verify-machineinstrs`
vararg.0dec39594d.ll (mutant of vararg.ll)	va1_va_arg	`-mtriple=riscv64 -target-abi lp64e -verify-machineinstrs`
vararg.0dec39594d.ll (mutant of vararg.ll)	va1_va_arg_alloca	`-mtriple=riscv64 -target-abi lp64e -verify-machineinstrs`
vararg.1c73717c51.ll (mutant of vararg.ll)	va1_va_arg_alloca	`-mtriple=riscv64 -target-abi lp64e -verify-machineinstrs`
vararg.1c73717c51.ll (mutant of vararg.ll)	va6_no_fixed_args	`-mtriple=riscv64 -target-abi lp64e -verify-machineinstrs`
vararg.323f4b3038.ll (mutant of vararg.ll)	va1_va_arg_alloca	`-mtriple=riscv64 -mattr=+d -target-abi lp64d -verify-machineinstrs`
vararg.323f4b3038.ll (mutant of vararg.ll)	va6_no_fixed_args	`-mtriple=riscv64 -mattr=+d -target-abi lp64d -verify-machineinstrs`
vararg.3d0070cb57.ll (mutant of vararg.ll)	va1_va_arg	`-mtriple=riscv64 -mattr=+d -target-abi lp64f -verify-machineinstrs`
vararg.3d0070cb57.ll (mutant of vararg.ll)	va1_va_arg_alloca	`-mtriple=riscv64 -mattr=+d -target-abi lp64f -verify-machineinstrs`
vararg.543b83e1ed.ll (mutant of vararg.ll)	va1_va_arg	`-mtriple=riscv64 -target-abi lp64e -frame-pointer=all -verify-machineinstrs`
vararg.543b83e1ed.ll (mutant of vararg.ll)	va1_va_arg_alloca	`-mtriple=riscv64 -target-abi lp64e -frame-pointer=all -verify-machineinstrs`
vararg.55327bfce3.ll (mutant of vararg.ll)	va1_va_arg_alloca	`-mtriple=riscv64 -verify-machineinstrs`
vararg.55327bfce3.ll (mutant of vararg.ll)	va6_no_fixed_args	`-mtriple=riscv64 -verify-machineinstrs`
vararg.5c7f0102b6.ll (mutant of vararg.ll)	va1_va_arg_alloca	`-mtriple=riscv64 -target-abi lp64e -frame-pointer=all -verify-machineinstrs`
vararg.5c7f0102b6.ll (mutant of vararg.ll)	va6_no_fixed_args	`-mtriple=riscv64 -target-abi lp64e -frame-pointer=all -verify-machineinstrs`
vararg.90827a41ec.ll (mutant of vararg.ll)	va1_va_arg_alloca	`-mtriple=riscv64 -verify-machineinstrs -frame-pointer=all`
vararg.90827a41ec.ll (mutant of vararg.ll)	va6_no_fixed_args	`-mtriple=riscv64 -verify-machineinstrs -frame-pointer=all`
vararg.9d64482c58.ll (mutant of vararg.ll)	va1_va_arg_alloca	`-mtriple=riscv64 -mattr=+d -target-abi lp64f -verify-machineinstrs`
vararg.9d64482c58.ll (mutant of vararg.ll)	va6_no_fixed_args	`-mtriple=riscv64 -mattr=+d -target-abi lp64f -verify-machineinstrs`
vararg.b872b3e7d9.ll (mutant of vararg.ll)	va1_va_arg	`-mtriple=riscv64 -verify-machineinstrs -frame-pointer=all`
vararg.b872b3e7d9.ll (mutant of vararg.ll)	va1_va_arg_alloca	`-mtriple=riscv64 -verify-machineinstrs -frame-pointer=all`
vararg.ef436ca61b.ll (mutant of vararg.ll)	va1_va_arg	`-mtriple=riscv64 -verify-machineinstrs`
vararg.ef436ca61b.ll (mutant of vararg.ll)	va1_va_arg_alloca	`-mtriple=riscv64 -verify-machineinstrs`

Generated 2026-10-15 08:05 UTC.