llvm/test/CodeGen/SPIRV/transcoding/OpBitReverse-subbyte.ll

; The goal of the test case is to ensure valid SPIR-V code emision
; on translation of integers with bit width less than 8.

; RUN: llc -O0 -mtriple=spirv64-unknown-unknown %s --spirv-ext=+SPV_KHR_bit_instructions -o - | FileCheck %s --check-prefix=CHECK-SPIRV
; RUN: %if spirv-tools %{ llc -O0 -mtriple=spirv64-unknown-unknown %s --spirv-ext=+SPV_KHR_bit_instructions -o - -filetype=obj | spirv-val %}

; RUN: llc -O0 -mtriple=spirv32-unknown-unknown %s --spirv-ext=+SPV_KHR_bit_instructions -o - | FileCheck %s --check-prefix=CHECK-SPIRV
; RUN: %if spirv-tools %{ llc -O0 -mtriple=spirv32-unknown-unknown %s --spirv-ext=+SPV_KHR_bit_instructions -o - -filetype=obj | spirv-val %}

; TODO: This test currently fails with LLVM_ENABLE_EXPENSIVE_CHECKS enabled
; XFAIL: expensive_checks

; CHECK-SPIRV: OpCapability BitInstructions
; CHECK-SPIRV: OpExtension "SPV_KHR_bit_instructions"
; CHECK-SPIRV: %[[#CharTy:]] = OpTypeInt 8 0
; CHECK-SPIRV-NO: %[[#CharTy:]] = OpTypeInt 8 0
; CHECK-SPIRV-COUNT-2: %[[#]] = OpBitReverse %[[#CharTy]] %[[#]]

; TODO: Add a check to ensure that there's no behavior change of bitreverse operation
;       between the LLVM-IR and SPIR-V for i2 and i4

define spir_func void @foo(i2 %a, i4 %b) {
entry:
  %res2 = tail call i2 @llvm.bitreverse.i2(i2 %a)
  %res4 = tail call i4 @llvm.bitreverse.i4(i4 %b)
  ret void
}

declare i2 @llvm.bitreverse.i2(i2)
declare i4 @llvm.bitreverse.i4(i4)