test/CodeGen/X86/bitreverse.ll

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

; These tests just check that the plumbing is in place for @llvm.bitreverse. The
; actual output is massive at the moment as llvm.bitreverse is not yet legal.

declare <2 x i16> @llvm.bitreverse.v2i16(<2 x i16>) readnone

define <2 x i16> @test_bitreverse_v2i16(<2 x i16> %a) nounwind {
; CHECK-LABEL: test_bitreverse_v2i16:
; CHECK:       # BB#0:
; CHECK-NEXT:    pushl %edi
; CHECK-NEXT:    pushl %esi
; CHECK-NEXT:    movzwl {{[0-9]+}}(%esp), %edx
; CHECK-NEXT:    movzwl {{[0-9]+}}(%esp), %eax
; CHECK-NEXT:    movl %eax, %ecx
; CHECK-NEXT:    shll $15, %ecx
; CHECK-NEXT:    movl %eax, %esi
; CHECK-NEXT:    andl $2, %esi
; CHECK-NEXT:    shll $13, %esi
; CHECK-NEXT:    orl %ecx, %esi
; CHECK-NEXT:    movl %eax, %ecx
; CHECK-NEXT:    andl $4, %ecx
; CHECK-NEXT:    shll $11, %ecx
; CHECK-NEXT:    orl %esi, %ecx
; CHECK-NEXT:    movl %eax, %esi
; CHECK-NEXT:    andl $8, %esi
; CHECK-NEXT:    shll $9, %esi
; CHECK-NEXT:    orl %ecx, %esi
; CHECK-NEXT:    movl %eax, %edi
; CHECK-NEXT:    andl $16, %edi
; CHECK-NEXT:    shll $7, %edi
; CHECK-NEXT:    orl %esi, %edi
; CHECK-NEXT:    movl %eax, %ecx
; CHECK-NEXT:    andl $32, %ecx
; CHECK-NEXT:    shll $5, %ecx
; CHECK-NEXT:    orl %edi, %ecx
; CHECK-NEXT:    movl %eax, %esi
; CHECK-NEXT:    andl $64, %esi
; CHECK-NEXT:    shll $3, %esi
; CHECK-NEXT:    leal (%eax,%eax), %edi
; CHECK-NEXT:    andl $256, %edi # imm = 0x100
; CHECK-NEXT:    orl %esi, %edi
; CHECK-NEXT:    movl %eax, %esi
; CHECK-NEXT:    shrl %esi
; CHECK-NEXT:    andl $128, %esi
; CHECK-NEXT:    orl %edi, %esi
; CHECK-NEXT:    movl %eax, %edi
; CHECK-NEXT:    shrl $3, %edi
; CHECK-NEXT:    andl $64, %edi
; CHECK-NEXT:    orl %esi, %edi
; CHECK-NEXT:    movl %eax, %esi
; CHECK-NEXT:    shrl $5, %esi
; CHECK-NEXT:    andl $32, %esi
; CHECK-NEXT:    orl %edi, %esi
; CHECK-NEXT:    movl %eax, %edi
; CHECK-NEXT:    shrl $7, %edi
; CHECK-NEXT:    andl $16, %edi
; CHECK-NEXT:    orl %esi, %edi
; CHECK-NEXT:    movl %eax, %esi
; CHECK-NEXT:    shrl $9, %esi
; CHECK-NEXT:    andl $8, %esi
; CHECK-NEXT:    orl %edi, %esi
; CHECK-NEXT:    movl %eax, %edi
; CHECK-NEXT:    shrl $11, %edi
; CHECK-NEXT:    andl $4, %edi
; CHECK-NEXT:    orl %esi, %edi
; CHECK-NEXT:    movl %eax, %esi
; CHECK-NEXT:    shrl $13, %esi
; CHECK-NEXT:    andl $2, %esi
; CHECK-NEXT:    orl %edi, %esi
; CHECK-NEXT:    shrl $15, %eax
; CHECK-NEXT:    orl %esi, %eax
; CHECK-NEXT:    orl %ecx, %eax
; CHECK-NEXT:    movl %edx, %ecx
; CHECK-NEXT:    shll $15, %ecx
; CHECK-NEXT:    movl %edx, %esi
; CHECK-NEXT:    andl $2, %esi
; CHECK-NEXT:    shll $13, %esi
; CHECK-NEXT:    orl %ecx, %esi
; CHECK-NEXT:    movl %edx, %ecx
; CHECK-NEXT:    andl $4, %ecx
; CHECK-NEXT:    shll $11, %ecx
; CHECK-NEXT:    orl %esi, %ecx
; CHECK-NEXT:    movl %edx, %esi
; CHECK-NEXT:    andl $8, %esi
; CHECK-NEXT:    shll $9, %esi
; CHECK-NEXT:    orl %ecx, %esi
; CHECK-NEXT:    movl %edx, %edi
; CHECK-NEXT:    andl $16, %edi
; CHECK-NEXT:    shll $7, %edi
; CHECK-NEXT:    orl %esi, %edi
; CHECK-NEXT:    movl %edx, %ecx
; CHECK-NEXT:    andl $32, %ecx
; CHECK-NEXT:    shll $5, %ecx
; CHECK-NEXT:    orl %edi, %ecx
; CHECK-NEXT:    movl %edx, %esi
; CHECK-NEXT:    andl $64, %esi
; CHECK-NEXT:    shll $3, %esi
; CHECK-NEXT:    leal (%edx,%edx), %edi
; CHECK-NEXT:    andl $256, %edi # imm = 0x100
; CHECK-NEXT:    orl %esi, %edi
; CHECK-NEXT:    movl %edx, %esi
; CHECK-NEXT:    shrl %esi
; CHECK-NEXT:    andl $128, %esi
; CHECK-NEXT:    orl %edi, %esi
; CHECK-NEXT:    movl %edx, %edi
; CHECK-NEXT:    shrl $3, %edi
; CHECK-NEXT:    andl $64, %edi
; CHECK-NEXT:    orl %esi, %edi
; CHECK-NEXT:    movl %edx, %esi
; CHECK-NEXT:    shrl $5, %esi
; CHECK-NEXT:    andl $32, %esi
; CHECK-NEXT:    orl %edi, %esi
; CHECK-NEXT:    movl %edx, %edi
; CHECK-NEXT:    shrl $7, %edi
; CHECK-NEXT:    andl $16, %edi
; CHECK-NEXT:    orl %esi, %edi
; CHECK-NEXT:    movl %edx, %esi
; CHECK-NEXT:    shrl $9, %esi
; CHECK-NEXT:    andl $8, %esi
; CHECK-NEXT:    orl %edi, %esi
; CHECK-NEXT:    movl %edx, %edi
; CHECK-NEXT:    shrl $11, %edi
; CHECK-NEXT:    andl $4, %edi
; CHECK-NEXT:    orl %esi, %edi
; CHECK-NEXT:    movl %edx, %esi
; CHECK-NEXT:    shrl $13, %esi
; CHECK-NEXT:    andl $2, %esi
; CHECK-NEXT:    orl %edi, %esi
; CHECK-NEXT:    shrl $15, %edx
; CHECK-NEXT:    orl %esi, %edx
; CHECK-NEXT:    orl %ecx, %edx
; CHECK-NEXT:    # kill: %AX<def> %AX<kill> %EAX<kill>
; CHECK-NEXT:    # kill: %DX<def> %DX<kill> %EDX<kill>
; CHECK-NEXT:    popl %esi
; CHECK-NEXT:    popl %edi
; CHECK-NEXT:    retl
  %b = call <2 x i16> @llvm.bitreverse.v2i16(<2 x i16> %a)
  ret <2 x i16> %b
}

declare i24 @llvm.bitreverse.i24(i24) readnone

define i24 @test_bitreverse_i24(i24 %a) nounwind {
; CHECK-LABEL: test_bitreverse_i24:
; CHECK:       # BB#0:
; CHECK-NEXT:    pushl %esi
; CHECK-NEXT:    movl {{[0-9]+}}(%esp), %eax
; CHECK-NEXT:    movl %eax, %ecx
; CHECK-NEXT:    shll $31, %ecx
; CHECK-NEXT:    movl %eax, %edx
; CHECK-NEXT:    andl $2, %edx
; CHECK-NEXT:    shll $29, %edx
; CHECK-NEXT:    orl %ecx, %edx
; CHECK-NEXT:    movl %eax, %ecx
; CHECK-NEXT:    andl $4, %ecx
; CHECK-NEXT:    shll $27, %ecx
; CHECK-NEXT:    orl %edx, %ecx
; CHECK-NEXT:    movl %eax, %edx
; CHECK-NEXT:    andl $8, %edx
; CHECK-NEXT:    shll $25, %edx
; CHECK-NEXT:    orl %ecx, %edx
; CHECK-NEXT:    movl %eax, %esi
; CHECK-NEXT:    andl $16, %esi
; CHECK-NEXT:    shll $23, %esi
; CHECK-NEXT:    orl %edx, %esi
; CHECK-NEXT:    movl %eax, %ecx
; CHECK-NEXT:    andl $32, %ecx
; CHECK-NEXT:    shll $21, %ecx
; CHECK-NEXT:    orl %esi, %ecx
; CHECK-NEXT:    movl %eax, %edx
; CHECK-NEXT:    andl $64, %edx
; CHECK-NEXT:    shll $19, %edx
; CHECK-NEXT:    movl %eax, %esi
; CHECK-NEXT:    shll $17, %esi
; CHECK-NEXT:    andl $16777216, %esi # imm = 0x1000000
; CHECK-NEXT:    orl %edx, %esi
; CHECK-NEXT:    movl %eax, %edx
; CHECK-NEXT:    shll $15, %edx
; CHECK-NEXT:    andl $8388608, %edx # imm = 0x800000
; CHECK-NEXT:    orl %esi, %edx
; CHECK-NEXT:    movl %eax, %esi
; CHECK-NEXT:    shll $13, %esi
; CHECK-NEXT:    andl $4194304, %esi # imm = 0x400000
; CHECK-NEXT:    orl %edx, %esi
; CHECK-NEXT:    movl %eax, %edx
; CHECK-NEXT:    shll $11, %edx
; CHECK-NEXT:    andl $2097152, %edx # imm = 0x200000
; CHECK-NEXT:    orl %esi, %edx
; CHECK-NEXT:    movl %eax, %esi
; CHECK-NEXT:    shll $9, %esi
; CHECK-NEXT:    andl $1048576, %esi # imm = 0x100000
; CHECK-NEXT:    orl %edx, %esi
; CHECK-NEXT:    movl %eax, %edx
; CHECK-NEXT:    shll $7, %edx
; CHECK-NEXT:    andl $524288, %edx # imm = 0x80000
; CHECK-NEXT:    orl %esi, %edx
; CHECK-NEXT:    movl %eax, %esi
; CHECK-NEXT:    shll $5, %esi
; CHECK-NEXT:    andl $262144, %esi # imm = 0x40000
; CHECK-NEXT:    orl %edx, %esi
; CHECK-NEXT:    leal (,%eax,8), %edx
; CHECK-NEXT:    andl $131072, %edx # imm = 0x20000
; CHECK-NEXT:    orl %esi, %edx
; CHECK-NEXT:    leal (%eax,%eax), %esi
; CHECK-NEXT:    andl $65536, %esi # imm = 0x10000
; CHECK-NEXT:    orl %edx, %esi
; CHECK-NEXT:    movl %eax, %edx
; CHECK-NEXT:    shrl %edx
; CHECK-NEXT:    andl $32768, %edx # imm = 0x8000
; CHECK-NEXT:    orl %esi, %edx
; CHECK-NEXT:    movl %eax, %esi
; CHECK-NEXT:    shrl $3, %esi
; CHECK-NEXT:    andl $16384, %esi # imm = 0x4000
; CHECK-NEXT:    orl %edx, %esi
; CHECK-NEXT:    movl %eax, %edx
; CHECK-NEXT:    shrl $5, %edx
; CHECK-NEXT:    andl $8192, %edx # imm = 0x2000
; CHECK-NEXT:    orl %esi, %edx
; CHECK-NEXT:    movl %eax, %esi
; CHECK-NEXT:    shrl $7, %esi
; CHECK-NEXT:    andl $4096, %esi # imm = 0x1000
; CHECK-NEXT:    orl %edx, %esi
; CHECK-NEXT:    movl %eax, %edx
; CHECK-NEXT:    shrl $9, %edx
; CHECK-NEXT:    andl $2048, %edx # imm = 0x800
; CHECK-NEXT:    orl %esi, %edx
; CHECK-NEXT:    movl %eax, %esi
; CHECK-NEXT:    shrl $11, %esi
; CHECK-NEXT:    andl $1024, %esi # imm = 0x400
; CHECK-NEXT:    orl %edx, %esi
; CHECK-NEXT:    movl %eax, %edx
; CHECK-NEXT:    shrl $13, %edx
; CHECK-NEXT:    andl $512, %edx # imm = 0x200
; CHECK-NEXT:    orl %esi, %edx
; CHECK-NEXT:    shrl $15, %eax
; CHECK-NEXT:    andl $256, %eax # imm = 0x100
; CHECK-NEXT:    orl %edx, %eax
; CHECK-NEXT:    orl %ecx, %eax
; CHECK-NEXT:    shrl $8, %eax
; CHECK-NEXT:    popl %esi
; CHECK-NEXT:    retl
  %b = call i24 @llvm.bitreverse.i24(i24 %a)
  ret i24 %b
}

declare i8 @llvm.bitreverse.i8(i8) readnone

define i8 @test_bitreverse_i8(i8 %a) {
; CHECK-LABEL: test_bitreverse_i8:
; CHECK:       # BB#0:
; CHECK-NEXT:    movb {{[0-9]+}}(%esp), %al
; CHECK-NEXT:    movl %eax, %ecx
; CHECK-NEXT:    shlb $7, %cl
; CHECK-NEXT:    movl %eax, %edx
; CHECK-NEXT:    shlb $5, %dl
; CHECK-NEXT:    andb $64, %dl
; CHECK-NEXT:    movb %al, %ah
; CHECK-NEXT:    shlb $3, %ah
; CHECK-NEXT:    andb $32, %ah
; CHECK-NEXT:    orb %dl, %ah
; CHECK-NEXT:    movl %eax, %edx
; CHECK-NEXT:    addb %dl, %dl
; CHECK-NEXT:    andb $16, %dl
; CHECK-NEXT:    orb %ah, %dl
; CHECK-NEXT:    movb %al, %ah
; CHECK-NEXT:    shrb %ah
; CHECK-NEXT:    andb $8, %ah
; CHECK-NEXT:    orb %dl, %ah
; CHECK-NEXT:    movl %eax, %edx
; CHECK-NEXT:    shrb $3, %dl
; CHECK-NEXT:    andb $4, %dl
; CHECK-NEXT:    orb %ah, %dl
; CHECK-NEXT:    movb %al, %ah
; CHECK-NEXT:    shrb $5, %ah
; CHECK-NEXT:    andb $2, %ah
; CHECK-NEXT:    orb %dl, %ah
; CHECK-NEXT:    shrb $7, %al
; CHECK-NEXT:    orb %ah, %al
; CHECK-NEXT:    orb %cl, %al
; CHECK-NEXT:    retl
  %b = call i8 @llvm.bitreverse.i8(i8 %a)
  ret i8 %b
}

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

define i4 @test_bitreverse_i4(i4 %a) {
; CHECK-LABEL: test_bitreverse_i4:
; CHECK:       # BB#0:
; CHECK-NEXT:    movb {{[0-9]+}}(%esp), %al
; CHECK-NEXT:    movl %eax, %ecx
; CHECK-NEXT:    shlb $7, %cl
; CHECK-NEXT:    movl %eax, %edx
; CHECK-NEXT:    shlb $5, %dl
; CHECK-NEXT:    andb $64, %dl
; CHECK-NEXT:    movb %al, %ah
; CHECK-NEXT:    shlb $3, %ah
; CHECK-NEXT:    andb $32, %ah
; CHECK-NEXT:    orb %dl, %ah
; CHECK-NEXT:    addb %al, %al
; CHECK-NEXT:    andb $16, %al
; CHECK-NEXT:    orb %ah, %al
; CHECK-NEXT:    orb %cl, %al
; CHECK-NEXT:    shrb $4, %al
; CHECK-NEXT:    retl
  %b = call i4 @llvm.bitreverse.i4(i4 %a)
  ret i4 %b
}

; These tests check that bitreverse(constant) calls are folded

define <2 x i16> @fold_v2i16() {
; CHECK-LABEL: fold_v2i16:
; CHECK:       # BB#0:
; CHECK-NEXT:    movw $-4096, %ax # imm = 0xF000
; CHECK-NEXT:    movw $240, %dx
; CHECK-NEXT:    retl
  %b = call <2 x i16> @llvm.bitreverse.v2i16(<2 x i16> <i16 15, i16 3840>)
  ret <2 x i16> %b
}

define i24 @fold_i24() {
; CHECK-LABEL: fold_i24:
; CHECK:       # BB#0:
; CHECK-NEXT:    movl $2048, %eax # imm = 0x800
; CHECK-NEXT:    retl
  %b = call i24 @llvm.bitreverse.i24(i24 4096)
  ret i24 %b
}

define i8 @fold_i8() {
; CHECK-LABEL: fold_i8:
; CHECK:       # BB#0:
; CHECK-NEXT:    movb $-16, %al
; CHECK-NEXT:    retl
  %b = call i8 @llvm.bitreverse.i8(i8 15)
  ret i8 %b
}

define i4 @fold_i4() {
; CHECK-LABEL: fold_i4:
; CHECK:       # BB#0:
; CHECK-NEXT:    movb $1, %al
; CHECK-NEXT:    retl
  %b = call i4 @llvm.bitreverse.i4(i4 8)
  ret i4 %b
}

; These tests check that bitreverse(bitreverse()) calls are removed

define i8 @identity_i8(i8 %a) {
; CHECK-LABEL: identity_i8:
; CHECK:       # BB#0:
; CHECK-NEXT:    movb {{[0-9]+}}(%esp), %al
; CHECK-NEXT:    retl
  %b = call i8 @llvm.bitreverse.i8(i8 %a)
  %c = call i8 @llvm.bitreverse.i8(i8 %b)
  ret i8 %c
}

define <2 x i16> @identity_v2i16(<2 x i16> %a) {
; CHECK-LABEL: identity_v2i16:
; CHECK:       # BB#0:
; CHECK-NEXT:    movzwl {{[0-9]+}}(%esp), %eax
; CHECK-NEXT:    movzwl {{[0-9]+}}(%esp), %edx
; CHECK-NEXT:    retl
  %b = call <2 x i16> @llvm.bitreverse.v2i16(<2 x i16> %a)
  %c = call <2 x i16> @llvm.bitreverse.v2i16(<2 x i16> %b)
  ret <2 x i16> %c
}

; These tests check that bitreverse(undef) calls are removed

define i8 @undef_i8() {
; CHECK-LABEL: undef_i8:
; CHECK:       # BB#0:
; CHECK-NEXT:    retl
  %b = call i8 @llvm.bitreverse.i8(i8 undef)
  ret i8 %b
}

define <2 x i16> @undef_v2i16() {
; CHECK-LABEL: undef_v2i16:
; CHECK:       # BB#0:
; CHECK-NEXT:    retl
  %b = call <2 x i16> @llvm.bitreverse.v2i16(<2 x i16> undef)
  ret <2 x i16> %b
}