third_party/llvm-7.0/llvm/test/CodeGen/X86/shift-combine.ll

; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc -mtriple=i686-unknown < %s | FileCheck %s --check-prefix=X32
; RUN: llc -mtriple=x86_64-unknown < %s | FileCheck %s --check-prefix=X64

@array = weak global [4 x i32] zeroinitializer

define i32 @test_lshr_and(i32 %x) {
; X32-LABEL: test_lshr_and:
; X32:       # %bb.0:
; X32-NEXT:    movl {{[0-9]+}}(%esp), %eax
; X32-NEXT:    andl $12, %eax
; X32-NEXT:    movl array(%eax), %eax
; X32-NEXT:    retl
;
; X64-LABEL: test_lshr_and:
; X64:       # %bb.0:
; X64-NEXT:    # kill: def $edi killed $edi def $rdi
; X64-NEXT:    shrl $2, %edi
; X64-NEXT:    andl $3, %edi
; X64-NEXT:    movl array(,%rdi,4), %eax
; X64-NEXT:    retq
  %tmp2 = lshr i32 %x, 2
  %tmp3 = and i32 %tmp2, 3
  %tmp4 = getelementptr [4 x i32], [4 x i32]* @array, i32 0, i32 %tmp3
  %tmp5 = load i32, i32* %tmp4, align 4
  ret i32 %tmp5
}

define i32* @test_exact1(i32 %a, i32 %b, i32* %x)  {
; X32-LABEL: test_exact1:
; X32:       # %bb.0:
; X32-NEXT:    movl {{[0-9]+}}(%esp), %eax
; X32-NEXT:    subl {{[0-9]+}}(%esp), %eax
; X32-NEXT:    sarl %eax
; X32-NEXT:    addl {{[0-9]+}}(%esp), %eax
; X32-NEXT:    retl
;
; X64-LABEL: test_exact1:
; X64:       # %bb.0:
; X64-NEXT:    subl %edi, %esi
; X64-NEXT:    sarl $3, %esi
; X64-NEXT:    movslq %esi, %rax
; X64-NEXT:    leaq (%rdx,%rax,4), %rax
; X64-NEXT:    retq
  %sub = sub i32 %b, %a
  %shr = ashr exact i32 %sub, 3
  %gep = getelementptr inbounds i32, i32* %x, i32 %shr
  ret i32* %gep
}

define i32* @test_exact2(i32 %a, i32 %b, i32* %x)  {
; X32-LABEL: test_exact2:
; X32:       # %bb.0:
; X32-NEXT:    movl {{[0-9]+}}(%esp), %eax
; X32-NEXT:    subl {{[0-9]+}}(%esp), %eax
; X32-NEXT:    sarl %eax
; X32-NEXT:    addl {{[0-9]+}}(%esp), %eax
; X32-NEXT:    retl
;
; X64-LABEL: test_exact2:
; X64:       # %bb.0:
; X64-NEXT:    subl %edi, %esi
; X64-NEXT:    sarl $3, %esi
; X64-NEXT:    movslq %esi, %rax
; X64-NEXT:    leaq (%rdx,%rax,4), %rax
; X64-NEXT:    retq
  %sub = sub i32 %b, %a
  %shr = ashr exact i32 %sub, 3
  %gep = getelementptr inbounds i32, i32* %x, i32 %shr
  ret i32* %gep
}

define i32* @test_exact3(i32 %a, i32 %b, i32* %x)  {
; X32-LABEL: test_exact3:
; X32:       # %bb.0:
; X32-NEXT:    movl {{[0-9]+}}(%esp), %eax
; X32-NEXT:    subl {{[0-9]+}}(%esp), %eax
; X32-NEXT:    addl {{[0-9]+}}(%esp), %eax
; X32-NEXT:    retl
;
; X64-LABEL: test_exact3:
; X64:       # %bb.0:
; X64-NEXT:    subl %edi, %esi
; X64-NEXT:    sarl $2, %esi
; X64-NEXT:    movslq %esi, %rax
; X64-NEXT:    leaq (%rdx,%rax,4), %rax
; X64-NEXT:    retq
  %sub = sub i32 %b, %a
  %shr = ashr exact i32 %sub, 2
  %gep = getelementptr inbounds i32, i32* %x, i32 %shr
  ret i32* %gep
}

define i32* @test_exact4(i32 %a, i32 %b, i32* %x)  {
; X32-LABEL: test_exact4:
; X32:       # %bb.0:
; X32-NEXT:    movl {{[0-9]+}}(%esp), %eax
; X32-NEXT:    subl {{[0-9]+}}(%esp), %eax
; X32-NEXT:    shrl %eax
; X32-NEXT:    addl {{[0-9]+}}(%esp), %eax
; X32-NEXT:    retl
;
; X64-LABEL: test_exact4:
; X64:       # %bb.0:
; X64-NEXT:    # kill: def $esi killed $esi def $rsi
; X64-NEXT:    subl %edi, %esi
; X64-NEXT:    shrl $3, %esi
; X64-NEXT:    leaq (%rdx,%rsi,4), %rax
; X64-NEXT:    retq
  %sub = sub i32 %b, %a
  %shr = lshr exact i32 %sub, 3
  %gep = getelementptr inbounds i32, i32* %x, i32 %shr
  ret i32* %gep
}

define i32* @test_exact5(i32 %a, i32 %b, i32* %x)  {
; X32-LABEL: test_exact5:
; X32:       # %bb.0:
; X32-NEXT:    movl {{[0-9]+}}(%esp), %eax
; X32-NEXT:    subl {{[0-9]+}}(%esp), %eax
; X32-NEXT:    shrl %eax
; X32-NEXT:    addl {{[0-9]+}}(%esp), %eax
; X32-NEXT:    retl
;
; X64-LABEL: test_exact5:
; X64:       # %bb.0:
; X64-NEXT:    # kill: def $esi killed $esi def $rsi
; X64-NEXT:    subl %edi, %esi
; X64-NEXT:    shrl $3, %esi
; X64-NEXT:    leaq (%rdx,%rsi,4), %rax
; X64-NEXT:    retq
  %sub = sub i32 %b, %a
  %shr = lshr exact i32 %sub, 3
  %gep = getelementptr inbounds i32, i32* %x, i32 %shr
  ret i32* %gep
}

define i32* @test_exact6(i32 %a, i32 %b, i32* %x)  {
; X32-LABEL: test_exact6:
; X32:       # %bb.0:
; X32-NEXT:    movl {{[0-9]+}}(%esp), %eax
; X32-NEXT:    subl {{[0-9]+}}(%esp), %eax
; X32-NEXT:    addl {{[0-9]+}}(%esp), %eax
; X32-NEXT:    retl
;
; X64-LABEL: test_exact6:
; X64:       # %bb.0:
; X64-NEXT:    # kill: def $esi killed $esi def $rsi
; X64-NEXT:    subl %edi, %esi
; X64-NEXT:    leaq (%rsi,%rdx), %rax
; X64-NEXT:    retq
  %sub = sub i32 %b, %a
  %shr = lshr exact i32 %sub, 2
  %gep = getelementptr inbounds i32, i32* %x, i32 %shr
  ret i32* %gep
}