fallback: legalize: G

fallback: legalize: G_SHL <8 x s8>

Run:	main-04ca53e65f-20261014-113325
Kind:	fallback
Category:	legalize: G_SHL <8 x s8>
Occurrences:	24 in 21 configs, 8 test files
Snippet from:	rvp-simd-64.ll @test_pslli_b 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 <8 x i8> @test_pslli_b(<8 x i8> %a) {
  %res = shl <8 x i8> %a, splat (i8 2)
  ret <8 x i8> %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: %3:_(<8 x s8>) = G_SHL %0:_, %1:_(<8 x s8>) (in function: test_pslli_b)
warning: Instruction selection used fallback path for test_pslli_b

Occurrences (24):

Input	Function	Config
rvp-simd-64.ll	test_pslli_b	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`
rvp-simd-64.ll	test_psll_bs	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`
rvp-simd-64.ll	test_psll_bs_mask	`-mtriple=riscv64 -mattr=+experimental-p,+m,+zbb -verify-machineinstrs`
calling-conv-ilp32e.6c51d35a0a.ll (mutant of calling-conv-ilp32e.ll)	caller_double_in_regs	`-mtriple=riscv32 -target-abi ilp32e -mattr=+save-restore -frame-pointer=all -verify-machineinstrs`
calling-conv-ilp32e.71612db440.ll (mutant of calling-conv-ilp32e.ll)	caller_double_in_regs	`-mtriple=riscv32 -target-abi ilp32e -mattr=+save-restore -verify-machineinstrs`
calling-conv-ilp32e.b330638fc7.ll (mutant of calling-conv-ilp32e.ll)	caller_double_in_regs	`-mtriple=riscv32 -target-abi ilp32e -frame-pointer=all -verify-machineinstrs`
calling-conv-ilp32e.f25470b973.ll (mutant of calling-conv-ilp32e.ll)	caller_double_in_regs	`-mtriple=riscv32 -target-abi ilp32e -verify-machineinstrs`
lack-of-signed-truncation-check.0505d546b7.ll (mutant of lack-of-signed-truncation-check.ll)	add_ultcmp_i32_i16	`-mtriple=riscv64-unknown-linux-gnu -mattr=+zbb`
lack-of-signed-truncation-check.744e95168f.ll (mutant of lack-of-signed-truncation-check.ll)	add_ultcmp_i32_i16	`-mtriple=riscv32-unknown-linux-gnu -mattr=+zbb`
lack-of-signed-truncation-check.ea9186983e.ll (mutant of lack-of-signed-truncation-check.ll)	add_ultcmp_i32_i16	`-mtriple=riscv64-unknown-linux-gnu`
lack-of-signed-truncation-check.f0decb43d3.ll (mutant of lack-of-signed-truncation-check.ll)	add_ultcmp_i32_i16	`-mtriple=riscv32-unknown-linux-gnu`
local-stack-slot-allocation.139095150e.ll (mutant of local-stack-slot-allocation.ll)	frame_pointer	`-mtriple=riscv32 -verify-machineinstrs`
local-stack-slot-allocation.fc662410d2.ll (mutant of local-stack-slot-allocation.ll)	frame_pointer	`-mtriple=riscv64 -verify-machineinstrs`
patchable-function-entry.138167159c.ll (mutant of patchable-function-entry.ll)	f3_2	`-mtriple=riscv64 -mattr=+c -M no-aliases`
patchable-function-entry.6e4e1aabb0.ll (mutant of patchable-function-entry.ll)	f3_2	`-mtriple=riscv32 -mattr=+c -M no-aliases`
patchable-function-entry.aa3a28e373.ll (mutant of patchable-function-entry.ll)	f3_2	`-mtriple=riscv32 -M no-aliases`
patchable-function-entry.b5a3f9876f.ll (mutant of patchable-function-entry.ll)	f3_2	`-mtriple=riscv64 -M no-aliases`
short-forward-branch-opt-qcloads.517d846d5c.ll (mutant of short-forward-branch-opt-qcloads.ll)	test_i32_volatile	`-verify-machineinstrs -mtriple=riscv32 -mattr=+xqcilo`
short-forward-branch-opt-qcloads.66a62d13f9.ll (mutant of short-forward-branch-opt-qcloads.ll)	test_i32_volatile	`-verify-machineinstrs -mtriple=riscv32 -mattr=+xqcilo,+short-forward-branch-ialu`
short-forward-branch-opt-qcloads.adc6c6a40e.ll (mutant of short-forward-branch-opt-qcloads.ll)	test_i32_volatile	`-verify-machineinstrs -mtriple=riscv32 -mattr=+xqcilo,+short-forward-branch-iload`
xcvalu.3321ba976b.ll (mutant of xcvalu.ll)	exths	`-O0 -mtriple=riscv32 -mattr=+m -mattr=+xcvalu -verify-machineinstrs`
xqcibm-extract.01990a7b2a.ll (mutant of xqcibm-extract.ll)	sexti16_i32	`-mtriple=riscv32 -mattr=+xqcibm,+zbb -verify-machineinstrs`
xqcibm-extract.68315b5917.ll (mutant of xqcibm-extract.ll)	sexti16_i32	`-mtriple=riscv32 -verify-machineinstrs`
xqcibm-extract.f51b130cd8.ll (mutant of xqcibm-extract.ll)	sexti16_i32	`-mtriple=riscv32 -mattr=+xqcibm -verify-machineinstrs`

Generated 2026-10-15 08:05 UTC.