fallback: legalize: G_LOAD s64,p10,s32

Run:	explore-bc8218b282-20261015-075519
Kind:	fallback
Category:	legalize: G_LOAD s64,p10,s32 NEW
Occurrences:	1 in 1 configs, 1 test files
Snippet from:	addrspacecast.2e6d8b7006.ll (mutant of addrspacecast.ll) @cast1 via llvm-extract
Config:	`-mtriple=riscv64 -verify-machineinstrs`
Local check:	reproduces at bc8218b282
Compiler Explorer:	not uploaded (over --godbolt-limit or disabled)

Snippet:

@G = external global i128

define void @cast1(ptr %ptr) {
  %LGV = load i128, ptr @G, align 4
  %castptr = addrspacecast ptr %ptr to ptr addrspace(10)
  %L = load i128, ptr addrspace(10) %castptr, align 4
  %B = add i128 %LGV, %L
  call void @foo(ptr addrspace(10) %castptr)
  store i128 %B, ptr @G, align 4
  ret void
}

declare void @foo(ptr addrspace(10))

Reproduce:

llc -mtriple=riscv64 -verify-machineinstrs -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc -mtriple=riscv64 -verify-machineinstrs -global-isel=0 snippet.ll -o -

Local llc output:

remark: <unknown>:0:0: unable to legalize instruction: %40:_(s64) = G_LOAD %39:_(p10) :: (load (s32) from %ir.castptr + 12, addrspace 10) (in function: cast1)
warning: Instruction selection used fallback path for cast1

Occurrences (1):

Input	Function	Config
addrspacecast.2e6d8b7006.ll (mutant of addrspacecast.ll)	cast1	`-mtriple=riscv64 -verify-machineinstrs`

Generated 2026-10-15 08:05 UTC.