llvm/test/CodeGen/SPIRV/branching/OpSwitchChar.ll

;; __kernel void test_switch(__global int* res, uchar val)
;; {
;;   switch(val)
;;   {
;;   case 0:
;;     *res = 1;
;;     break;
;;   case 1:
;;     *res = 2;
;;     break;
;;   case 2:
;;     *res = 3;
;;     break;
;;   }
;; }

; RUN: llc -O0 -mtriple=spirv32-unknown-unknown %s -o - | FileCheck %s --check-prefix=CHECK-SPIRV

; CHECK-SPIRV: OpSwitch %[[#]] %[[#]] 0 %[[#]] 1 %[[#]] 2 %[[#]]

define spir_kernel void @test_switch(i32 addrspace(1)* %res, i8 zeroext %val) {
entry:
  %res.addr = alloca i32 addrspace(1)*, align 4
  %val.addr = alloca i8, align 1
  store i32 addrspace(1)* %res, i32 addrspace(1)** %res.addr, align 4
  store i8 %val, i8* %val.addr, align 1
  %0 = load i8, i8* %val.addr, align 1
  switch i8 %0, label %sw.epilog [
    i8 0, label %sw.bb
    i8 1, label %sw.bb1
    i8 2, label %sw.bb2
  ]

sw.bb:                                            ; preds = %entry
  %1 = load i32 addrspace(1)*, i32 addrspace(1)** %res.addr, align 4
  store i32 1, i32 addrspace(1)* %1, align 4
  br label %sw.epilog

sw.bb1:                                           ; preds = %entry
  %2 = load i32 addrspace(1)*, i32 addrspace(1)** %res.addr, align 4
  store i32 2, i32 addrspace(1)* %2, align 4
  br label %sw.epilog

sw.bb2:                                           ; preds = %entry
  %3 = load i32 addrspace(1)*, i32 addrspace(1)** %res.addr, align 4
  store i32 3, i32 addrspace(1)* %3, align 4
  br label %sw.epilog

sw.epilog:                                        ; preds = %entry, %sw.bb2, %sw.bb1, %sw.bb
  ret void
}