fallback: legalize: G_FPTOSI s32,s128

Run:	explore-bc8218b282-20261015-075519
Kind:	fallback
Category:	legalize: G_FPTOSI s32,s128
Occurrences:	2 in 1 configs, 1 test files
Snippet from:	fp128.ll @test_add_and_fptosi via llvm-extract
Config:	`-mtriple=riscv32 -verify-machineinstrs`
Local check:	reproduces at bc8218b282
Compiler Explorer:	not uploaded (over --godbolt-limit or disabled)

Snippet:

@x = external local_unnamed_addr global fp128, align 16
@y = external local_unnamed_addr global fp128, align 16

; Function Attrs: nounwind
define i32 @test_add_and_fptosi() #0 {
  %1 = load fp128, ptr @x, align 16
  %2 = load fp128, ptr @y, align 16
  %3 = fadd fp128 %1, %2
  %4 = fptosi fp128 %3 to i32
  ret i32 %4
}

attributes #0 = { nounwind }

Reproduce:

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

Local llc output:

remark: <unknown>:0:0: unable to legalize instruction: %5:_(s32) = G_FPTOSI %4:_(s128) (in function: test_add_and_fptosi)
warning: Instruction selection used fallback path for test_add_and_fptosi

Occurrences (2):

Input	Function	Config
fp128.ll	test_add_and_fptosi	`-mtriple=riscv32 -verify-machineinstrs`
fp128.0392cb2e82.ll (mutant of fp128.ll)	test_add_and_fptosi	`-mtriple=riscv32 -verify-machineinstrs`

Generated 2026-10-15 08:05 UTC.