fallback: legalize: G

fallback: legalize: G_ADD <2 x s32>

Run:	explore-bc8218b282-20261015-075519
Kind:	fallback
Category:	legalize: G_ADD <2 x s32>
Occurrences:	23 in 2 configs, 5 test files
Snippet from:	calling-conv-p-ext-vector.ll @test_cc_v2i32 via llvm-extract
Config:	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`
Local check:	reproduces at bc8218b282
Compiler Explorer:	not uploaded (over --godbolt-limit or disabled)

Snippet:

define <2 x i32> @test_cc_v2i32(<2 x i32> %a, <2 x i32> %b) {
  %res = add <2 x i32> %a, %b
  ret <2 x i32> %res
}

Reproduce:

llc -mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc -mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs -global-isel=0 snippet.ll -o -

Local llc output:

remark: <unknown>:0:0: unable to legalize instruction: %2:_(<2 x s32>) = G_ADD %0:_, %1:_ (in function: test_cc_v2i32)
warning: Instruction selection used fallback path for test_cc_v2i32

Occurrences (23):

Input	Function	Config
calling-conv-p-ext-vector.ll	test_cc_v2i32	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`
rvp-mul-parts-acc-fold.ll	pmacc_h00	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`
rvp-mul-parts-acc-fold.ll	pmacc_h01	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`
rvp-mul-parts-acc-fold.ll	pmacc_h11	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`
rvp-mul-parts-acc-fold.ll	pmaccu_h00	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`
rvp-mul-parts-acc-fold.ll	pmaccu_h01	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`
rvp-mul-parts-acc-fold.ll	pmaccu_h11	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`
rvp-mul-parts-acc-fold.ll	pmaccsu_h00	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`
rvp-mul-parts-acc-fold.ll	pmaccsu_h11	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`
rvp-simd-32.ll	test_pwadd_h	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`
rvp-simd-32.ll	test_pwaddu_h	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`
rvp-simd-64.ll	test_padd_w	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`
rvp-simd-64.ll	test_psh1add_w	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`
rvp-simd-64.ll	test_paaddu_w	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`
rvp-simd-64.ll	test_padd_ws_splat_lhs	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`
rvp-simd-64.ll	test_padd_ws_splat_rhs	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`
rvp-widening-add-acc.ll	test_pwadda_v2i16	`-mtriple=riscv64 -mattr=+experimental-p -verify-machineinstrs`
rvp-widening-add-acc.ll	test_pwaddau_v2i16	`-mtriple=riscv64 -mattr=+experimental-p -verify-machineinstrs`
rvp-mul-parts-acc-fold.2172ae6bb7.ll (mutant of rvp-mul-parts-acc-fold.ll)	pmaccu_h00	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`
rvp-mul-parts-acc-fold.2172ae6bb7.ll (mutant of rvp-mul-parts-acc-fold.ll)	pmaccsu_h11	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`
rvp-mul-parts-acc-fold.a34f85887c.ll (mutant of rvp-mul-parts-acc-fold.ll)	pmaccu_h01	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`
rvp-widening-add-acc.1d9b95bba6.ll (mutant of rvp-widening-add-acc.ll)	test_pwaddau_v2i16	`-mtriple=riscv64 -mattr=+experimental-p -verify-machineinstrs`
rvp-widening-add-acc.483cbb9468.ll (mutant of rvp-widening-add-acc.ll)	test_pwadda_v2i16	`-mtriple=riscv64 -mattr=+experimental-p -verify-machineinstrs`

Generated 2026-10-15 08:05 UTC.