llvm-project/llvm/test/CodeGen/X86/urem-seteq.ll

; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc -mtriple=i686-unknown-linux-gnu < %s | FileCheck %s --check-prefixes=CHECK,X86
; RUN: llc -mtriple=x86_64-unknown-linux-gnu < %s | FileCheck %s --check-prefixes=CHECK,X64

; This tests the BuildREMEqFold optimization with UREM, i32, odd divisor, SETEQ.
; The corresponding pseudocode is:
; Q <- [N * multInv(5, 2^32)] <=> [N * 0xCCCCCCCD] <=> [N * (-858993459)]
; res <- [Q <= (2^32 - 1) / 5] <=> [Q <= 858993459] <=> [Q < 858993460]
define i32 @test_urem_odd(i32 %X) nounwind readnone {
; X86-LABEL: test_urem_odd:
; X86:       # %bb.0:
; X86-NEXT:    imull $-858993459, {{[0-9]+}}(%esp), %ecx # imm = 0xCCCCCCCD
; X86-NEXT:    xorl %eax, %eax
; X86-NEXT:    cmpl $858993460, %ecx # imm = 0x33333334
; X86-NEXT:    setb %al
; X86-NEXT:    retl
;
; X64-LABEL: test_urem_odd:
; X64:       # %bb.0:
; X64-NEXT:    imull $-858993459, %edi, %ecx # imm = 0xCCCCCCCD
; X64-NEXT:    xorl %eax, %eax
; X64-NEXT:    cmpl $858993460, %ecx # imm = 0x33333334
; X64-NEXT:    setb %al
; X64-NEXT:    retq
  %urem = urem i32 %X, 5
  %cmp = icmp eq i32 %urem, 0
  %ret = zext i1 %cmp to i32
  ret i32 %ret
}

; This is like test_urem_odd, except the divisor has bit 30 set.
define i32 @test_urem_odd_bit30(i32 %X) nounwind readnone {
; X86-LABEL: test_urem_odd_bit30:
; X86:       # %bb.0:
; X86-NEXT:    imull $1789569707, {{[0-9]+}}(%esp), %ecx # imm = 0x6AAAAAAB
; X86-NEXT:    xorl %eax, %eax
; X86-NEXT:    cmpl $4, %ecx
; X86-NEXT:    setb %al
; X86-NEXT:    retl
;
; X64-LABEL: test_urem_odd_bit30:
; X64:       # %bb.0:
; X64-NEXT:    imull $1789569707, %edi, %ecx # imm = 0x6AAAAAAB
; X64-NEXT:    xorl %eax, %eax
; X64-NEXT:    cmpl $4, %ecx
; X64-NEXT:    setb %al
; X64-NEXT:    retq
  %urem = urem i32 %X, 1073741827
  %cmp = icmp eq i32 %urem, 0
  %ret = zext i1 %cmp to i32
  ret i32 %ret
}

; This is like test_urem_odd, except the divisor has bit 31 set.
define i32 @test_urem_odd_bit31(i32 %X) nounwind readnone {
; X86-LABEL: test_urem_odd_bit31:
; X86:       # %bb.0:
; X86-NEXT:    imull $715827883, {{[0-9]+}}(%esp), %ecx # imm = 0x2AAAAAAB
; X86-NEXT:    xorl %eax, %eax
; X86-NEXT:    cmpl $2, %ecx
; X86-NEXT:    setb %al
; X86-NEXT:    retl
;
; X64-LABEL: test_urem_odd_bit31:
; X64:       # %bb.0:
; X64-NEXT:    imull $715827883, %edi, %ecx # imm = 0x2AAAAAAB
; X64-NEXT:    xorl %eax, %eax
; X64-NEXT:    cmpl $2, %ecx
; X64-NEXT:    setb %al
; X64-NEXT:    retq
  %urem = urem i32 %X, 2147483651
  %cmp = icmp eq i32 %urem, 0
  %ret = zext i1 %cmp to i32
  ret i32 %ret
}

; This tests the BuildREMEqFold optimization with UREM, i16, even divisor, SETNE.
; In this case, D <=> 14 <=> 7 * 2^1, so D0 = 7 and K = 1.
; The corresponding pseudocode is:
; Q <- [N * multInv(D0, 2^16)] <=> [N * multInv(7, 2^16)] <=> [N * 28087]
; Q <- [Q >>rot K] <=> [Q >>rot 1]
; res <- ![Q <= (2^16 - 1) / 7] <=> ![Q <= 9362] <=> [Q > 9362]
define i16 @test_urem_even(i16 %X) nounwind readnone {
; X86-LABEL: test_urem_even:
; X86:       # %bb.0:
; X86-NEXT:    imull $28087, {{[0-9]+}}(%esp), %eax # imm = 0x6DB7
; X86-NEXT:    rorw %ax
; X86-NEXT:    movzwl %ax, %ecx
; X86-NEXT:    xorl %eax, %eax
; X86-NEXT:    cmpl $4681, %ecx # imm = 0x1249
; X86-NEXT:    seta %al
; X86-NEXT:    # kill: def $ax killed $ax killed $eax
; X86-NEXT:    retl
;
; X64-LABEL: test_urem_even:
; X64:       # %bb.0:
; X64-NEXT:    imull $28087, %edi, %eax # imm = 0x6DB7
; X64-NEXT:    rorw %ax
; X64-NEXT:    movzwl %ax, %ecx
; X64-NEXT:    xorl %eax, %eax
; X64-NEXT:    cmpl $4681, %ecx # imm = 0x1249
; X64-NEXT:    seta %al
; X64-NEXT:    # kill: def $ax killed $ax killed $eax
; X64-NEXT:    retq
  %urem = urem i16 %X, 14
  %cmp = icmp ne i16 %urem, 0
  %ret = zext i1 %cmp to i16
  ret i16 %ret
}

; This is like test_urem_even, except the divisor has bit 30 set.
define i32 @test_urem_even_bit30(i32 %X) nounwind readnone {
; X86-LABEL: test_urem_even_bit30:
; X86:       # %bb.0:
; X86-NEXT:    imull $-51622203, {{[0-9]+}}(%esp), %ecx # imm = 0xFCEC4EC5
; X86-NEXT:    rorl $3, %ecx
; X86-NEXT:    xorl %eax, %eax
; X86-NEXT:    cmpl $4, %ecx
; X86-NEXT:    setb %al
; X86-NEXT:    retl
;
; X64-LABEL: test_urem_even_bit30:
; X64:       # %bb.0:
; X64-NEXT:    imull $-51622203, %edi, %ecx # imm = 0xFCEC4EC5
; X64-NEXT:    rorl $3, %ecx
; X64-NEXT:    xorl %eax, %eax
; X64-NEXT:    cmpl $4, %ecx
; X64-NEXT:    setb %al
; X64-NEXT:    retq
  %urem = urem i32 %X, 1073741928
  %cmp = icmp eq i32 %urem, 0
  %ret = zext i1 %cmp to i32
  ret i32 %ret
}

; This is like test_urem_odd, except the divisor has bit 31 set.
define i32 @test_urem_even_bit31(i32 %X) nounwind readnone {
; X86-LABEL: test_urem_even_bit31:
; X86:       # %bb.0:
; X86-NEXT:    imull $-1157956869, {{[0-9]+}}(%esp), %ecx # imm = 0xBAFAFAFB
; X86-NEXT:    rorl %ecx
; X86-NEXT:    xorl %eax, %eax
; X86-NEXT:    cmpl $2, %ecx
; X86-NEXT:    setb %al
; X86-NEXT:    retl
;
; X64-LABEL: test_urem_even_bit31:
; X64:       # %bb.0:
; X64-NEXT:    imull $-1157956869, %edi, %ecx # imm = 0xBAFAFAFB
; X64-NEXT:    rorl %ecx
; X64-NEXT:    xorl %eax, %eax
; X64-NEXT:    cmpl $2, %ecx
; X64-NEXT:    setb %al
; X64-NEXT:    retq
  %urem = urem i32 %X, 2147483750
  %cmp = icmp eq i32 %urem, 0
  %ret = zext i1 %cmp to i32
  ret i32 %ret
}

; We should not proceed with this fold if the divisor is 1 or -1
define i32 @test_urem_one(i32 %X) nounwind readnone {
; CHECK-LABEL: test_urem_one:
; CHECK:       # %bb.0:
; CHECK-NEXT:    movl $1, %eax
; CHECK-NEXT:    ret{{[l|q]}}
  %urem = urem i32 %X, 1
  %cmp = icmp eq i32 %urem, 0
  %ret = zext i1 %cmp to i32
  ret i32 %ret
}

define i32 @test_urem_100(i32 %X) nounwind readnone {
; X86-LABEL: test_urem_100:
; X86:       # %bb.0:
; X86-NEXT:    imull $-1030792151, {{[0-9]+}}(%esp), %ecx # imm = 0xC28F5C29
; X86-NEXT:    rorl $2, %ecx
; X86-NEXT:    xorl %eax, %eax
; X86-NEXT:    cmpl $42949673, %ecx # imm = 0x28F5C29
; X86-NEXT:    setb %al
; X86-NEXT:    retl
;
; X64-LABEL: test_urem_100:
; X64:       # %bb.0:
; X64-NEXT:    imull $-1030792151, %edi, %ecx # imm = 0xC28F5C29
; X64-NEXT:    rorl $2, %ecx
; X64-NEXT:    xorl %eax, %eax
; X64-NEXT:    cmpl $42949673, %ecx # imm = 0x28F5C29
; X64-NEXT:    setb %al
; X64-NEXT:    retq
  %urem = urem i32 %X, 100
  %cmp = icmp eq i32 %urem, 0
  %ret = zext i1 %cmp to i32
  ret i32 %ret
}

; We can lower remainder of division by powers of two much better elsewhere;
; also, BuildREMEqFold does not work when the only odd factor of the divisor is 1.
; This ensures we don't touch powers of two.
define i32 @test_urem_pow2(i32 %X) nounwind readnone {
; X86-LABEL: test_urem_pow2:
; X86:       # %bb.0:
; X86-NEXT:    xorl %eax, %eax
; X86-NEXT:    testb $15, {{[0-9]+}}(%esp)
; X86-NEXT:    sete %al
; X86-NEXT:    retl
;
; X64-LABEL: test_urem_pow2:
; X64:       # %bb.0:
; X64-NEXT:    xorl %eax, %eax
; X64-NEXT:    testb $15, %dil
; X64-NEXT:    sete %al
; X64-NEXT:    retq
  %urem = urem i32 %X, 16
  %cmp = icmp eq i32 %urem, 0
  %ret = zext i1 %cmp to i32
  ret i32 %ret
}