fallback: legalize: G

fallback: legalize: G_MUL <4 x s16>

Run:	explore-04ca53e65f-20261014-114124
Kind:	fallback
Category:	legalize: G_MUL <4 x s16>
Occurrences:	13 in 5 configs, 5 test files
Snippet from:	rvp-simd-64.ll @test_pmul_h via llvm-extract
Config:	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`
Local check:	reproduces at 04ca53e65f
Compiler Explorer:	not uploaded (over --godbolt-limit or disabled)

Snippet:

define <4 x i16> @test_pmul_h(<4 x i16> %a, <4 x i16> %b) {
  %res = mul <4 x i16> %a, %b
  ret <4 x i16> %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:_(<4 x s16>) = G_MUL %0:_, %1:_ (in function: test_pmul_h)
warning: Instruction selection used fallback path for test_pmul_h

Occurrences (13):

Input	Function	Config
rvp-simd-32.ll	test_pwmul_b	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`
rvp-simd-32.ll	test_pwmulu_b	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`
rvp-simd-32.ll	test_pwmulsu_b	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`
rvp-simd-64.ll	test_pmul_h	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`
rvp-widening-convert.57cfd69c23.ll (mutant of rvp-widening-convert.ll)	test_pwcvt_v4i8	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`
srem-vector-lkk.3dad909432.ll (mutant of srem-vector-lkk.ll)	dont_fold_srem_one	`-mtriple=riscv64 -mattr=+m -verify-machineinstrs`
srem-vector-lkk.89f6620cb9.ll (mutant of srem-vector-lkk.ll)	dont_fold_srem_one	`-mtriple=riscv32 -verify-machineinstrs`
srem-vector-lkk.a4bf9ecf02.ll (mutant of srem-vector-lkk.ll)	dont_fold_srem_one	`-mtriple=riscv64 -verify-machineinstrs`
srem-vector-lkk.e0083009ad.ll (mutant of srem-vector-lkk.ll)	dont_fold_srem_one	`-mtriple=riscv32 -mattr=+m -verify-machineinstrs`
urem-vector-lkk.4a0f1e0a2c.ll (mutant of urem-vector-lkk.ll)	dont_fold_urem_one	`-mtriple=riscv32 -verify-machineinstrs`
urem-vector-lkk.59ce91cab3.ll (mutant of urem-vector-lkk.ll)	dont_fold_urem_one	`-mtriple=riscv64 -verify-machineinstrs`
urem-vector-lkk.6f2768d3af.ll (mutant of urem-vector-lkk.ll)	dont_fold_urem_one	`-mtriple=riscv64 -mattr=+m -verify-machineinstrs`
urem-vector-lkk.99c173e3df.ll (mutant of urem-vector-lkk.ll)	dont_fold_urem_one	`-mtriple=riscv32 -mattr=+m -verify-machineinstrs`

Generated 2026-10-15 08:05 UTC.