fallback: legalize: G

fallback: legalize: G_CLMUL s96

Run:	explore-04ca53e65f-20261014-114124
Kind:	fallback
Category:	legalize: G_CLMUL s96
Occurrences:	15 in 10 configs, 1 test files
Snippet from:	clmul.ll @clmul_i96 via llvm-extract
Config:	`-mtriple=riscv32 -mattr=+m -verify-machineinstrs`
Local check:	reproduces at 04ca53e65f
Compiler Explorer:	not uploaded (over --godbolt-limit or disabled)

Snippet:

define i96 @clmul_i96(i96 %x, i96 %y) {
  %a = call i96 @llvm.clmul.i96(i96 %x, i96 %y)
  ret i96 %a
}

; Function Attrs: nocallback nocreateundeforpoison nofree nosync nounwind speculatable willreturn memory(none)
declare i96 @llvm.clmul.i96(i96, i96) #0

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

Reproduce:

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

Local llc output:

remark: <unknown>:0:0: unable to legalize instruction: %5:_(s96) = G_CLMUL %0:_, %1:_ (in function: clmul_i96)
warning: Instruction selection used fallback path for clmul_i96

Occurrences (15):

Input	Function	Config
clmul.ll	clmul_i96	`-mtriple=riscv32 -mattr=+m -verify-machineinstrs`
clmul.ll	clmul_i96	`-mtriple=riscv32 -mattr=+m,+zbc -verify-machineinstrs`
clmul.ll	clmul_i96	`-mtriple=riscv32 -mattr=+m,+zbs -verify-machineinstrs`
clmul.ll	clmul_i96	`-mtriple=riscv32 -mattr=+m,+zvbc -verify-machineinstrs`
clmul.ll	clmul_i96	`-mtriple=riscv32 -verify-machineinstrs`
clmul.ll	clmul_i96	`-mtriple=riscv64 -mattr=+m -verify-machineinstrs`
clmul.ll	clmul_i96	`-mtriple=riscv64 -mattr=+m,+zbc -verify-machineinstrs`
clmul.ll	clmul_i96	`-mtriple=riscv64 -mattr=+m,+zbs -verify-machineinstrs`
clmul.ll	clmul_i96	`-mtriple=riscv64 -mattr=+m,+zvbc -verify-machineinstrs`
clmul.ll	clmul_i96	`-mtriple=riscv64 -verify-machineinstrs`
clmul.090f674934.ll (mutant of clmul.ll)	clmul_i96	`-mtriple=riscv64 -mattr=+m -verify-machineinstrs`
clmul.3260931539.ll (mutant of clmul.ll)	clmul_i96	`-mtriple=riscv64 -mattr=+m,+zvbc -verify-machineinstrs`
clmul.5764d9a7ff.ll (mutant of clmul.ll)	clmul_i96	`-mtriple=riscv64 -mattr=+m,+zbs -verify-machineinstrs`
clmul.da3442da73.ll (mutant of clmul.ll)	clmul_i96	`-mtriple=riscv64 -mattr=+m,+zbc -verify-machineinstrs`
clmul.e6209407a9.ll (mutant of clmul.ll)	clmul_i96	`-mtriple=riscv64 -verify-machineinstrs`

Generated 2026-10-15 08:05 UTC.