llvm-project/llvm/test/Transforms/Reassociate/fast-ReassociateVector.ll

; RUN: opt < %s -reassociate -S | FileCheck %s

; Check that a*c+b*c is turned into (a+b)*c
define <4 x float> @test1(<4 x float> %a, <4 x float> %b, <4 x float> %c) {
; CHECK-LABEL: @test1
; CHECK-NEXT: %tmp = fadd fast <4 x float> %b, %a
; CHECK-NEXT: %tmp1 = fmul fast <4 x float> %tmp, %c
; CHECK-NEXT: ret <4 x float> %tmp1

  %mul = fmul fast <4 x float> %a, %c
  %mul1 = fmul fast <4 x float> %b, %c
  %add = fadd fast <4 x float> %mul, %mul1
  ret <4 x float> %add
}

; Check that a*a*b+a*a*c is turned into a*(a*(b+c)).
define <2 x float> @test2(<2 x float> %a, <2 x float> %b, <2 x float> %c) {
; CHECK-LABEL: @test2
; CHECK-NEXT: [[TMP1:%tmp.*]] = fadd fast <2 x float> %c, %b
; CHECK-NEXT: [[TMP2:%tmp.*]] = fmul fast <2 x float> %a, %a
; CHECK-NEXT: fmul fast <2 x float> [[TMP2]], [[TMP1]]
; CHECK-NEXT: ret <2 x float>

  %t0 = fmul fast <2 x float> %a, %b
  %t1 = fmul fast <2 x float> %a, %t0
  %t2 = fmul fast <2 x float> %a, %c
  %t3 = fmul fast <2 x float> %a, %t2
  %t4 = fadd fast <2 x float> %t1, %t3
  ret <2 x float> %t4
}

; Check that a*b+a*c+d is turned into a*(b+c)+d.
define <2 x double> @test3(<2 x double> %a, <2 x double> %b, <2 x double> %c, <2 x double> %d) {
; CHECK-LABEL: @test3
; CHECK-NEXT: fadd fast <2 x double> %c, %b
; CHECK-NEXT: fmul fast <2 x double> %tmp, %a
; CHECK-NEXT: fadd fast <2 x double> %tmp1, %d
; CHECK-NEXT: ret <2 x double>

  %t0 = fmul fast <2 x double> %a, %b
  %t1 = fmul fast <2 x double> %a, %c
  %t2 = fadd fast <2 x double> %t1, %d
  %t3 = fadd fast <2 x double> %t0, %t2
  ret <2 x double> %t3
}

; No fast-math.
define <2 x float> @test4(<2 x float> %A) {
; CHECK-LABEL: @test4
; CHECK-NEXT: %X = fadd <2 x float> %A, <float 1.000000e+00, float 1.000000e+00>
; CHECK-NEXT: %Y = fadd <2 x float> %A, <float 1.000000e+00, float 1.000000e+00>
; CHECK-NEXT: %R = fsub <2 x float> %X, %Y
; CHECK-NEXT: ret <2 x float> %R

  %X = fadd <2 x float> %A, < float 1.000000e+00, float 1.000000e+00 >
  %Y = fadd <2 x float> %A, < float 1.000000e+00, float 1.000000e+00 >
  %R = fsub <2 x float> %X, %Y
  ret <2 x float> %R
}

; Check 47*X + 47*X -> 94*X.
define <2 x float> @test5(<2 x float> %X) {
; CHECK-LABEL: @test5
; CHECK-NEXT: fmul fast <2 x float> %X, <float 9.400000e+01, float 9.400000e+01>
; CHECK-NEXT: ret <2 x float>

  %Y = fmul fast <2 x float> %X, <float 4.700000e+01, float 4.700000e+01>
  %Z = fadd fast <2 x float> %Y, %Y
  ret <2 x float> %Z
}

; Check X+X+X -> 3*X.
define <2 x float> @test6(<2 x float> %X) {
; CHECK-LABEL: @test6
; CHECK-NEXT: fmul fast <2 x float> %X, <float 3.000000e+00, float 3.000000e+00>
; CHECK-NEXT: ret <2 x float>

  %Y = fadd fast <2 x float> %X ,%X
  %Z = fadd fast <2 x float> %Y, %X
  ret <2 x float> %Z
}

; Check 127*W+50*W -> 177*W.
define <2 x double> @test7(<2 x double> %W) {
; CHECK-LABEL: @test7
; CHECK-NEXT: fmul fast <2 x double> %W, <double 1.770000e+02, double 1.770000e+02>
; CHECK-NEXT: ret <2 x double>

  %X = fmul fast <2 x double> %W, <double 127.0, double 127.0>
  %Y = fmul fast <2 x double> %W, <double 50.0, double 50.0>
  %Z = fadd fast <2 x double> %Y, %X
  ret <2 x double> %Z
}

; Check X*12*12 -> X*144.
define <2 x float> @test8(<2 x float> %arg) {
; CHECK-LABEL: @test8
; CHECK: fmul fast <2 x float> %arg, <float 1.440000e+02, float 1.440000e+02>
; CHECK-NEXT: ret <2 x float> %tmp2

  %tmp1 = fmul fast <2 x float> <float 1.200000e+01, float 1.200000e+01>, %arg
  %tmp2 = fmul fast <2 x float> %tmp1, <float 1.200000e+01, float 1.200000e+01>
  ret <2 x float> %tmp2
}

; Check (b+(a+1234))+-a -> b+1234.
define <2 x double> @test9(<2 x double> %b, <2 x double> %a) {
; CHECK-LABEL: @test9
; CHECK: fadd fast <2 x double> %b, <double 1.234000e+03, double 1.234000e+03>
; CHECK-NEXT: ret <2 x double>

  %1 = fadd fast <2 x double> %a, <double 1.234000e+03, double 1.234000e+03>
  %2 = fadd fast <2 x double> %b, %1
  %3 = fsub fast <2 x double> <double 0.000000e+00, double 0.000000e+00>, %a
  %4 = fadd fast <2 x double> %2, %3
  ret <2 x double> %4
}

; Check -(-(z*40)*a) -> a*40*z.
define <2 x float> @test10(<2 x float> %a, <2 x float> %b, <2 x float> %z) {
; CHECK-LABEL: @test10
; CHECK: fmul fast <2 x float> %a, <float 4.000000e+01, float 4.000000e+01>
; CHECK-NEXT: fmul fast <2 x float> %e, %z
; CHECK-NEXT: ret <2 x float>

  %d = fmul fast <2 x float> %z, <float 4.000000e+01, float 4.000000e+01>
  %c = fsub fast <2 x float> <float 0.000000e+00, float 0.000000e+00>, %d
  %e = fmul fast <2 x float> %a, %c
  %f = fsub fast <2 x float> <float 0.000000e+00, float 0.000000e+00>, %e
  ret <2 x float> %f
}

; Check x*y+y*x -> x*y*2.
define <2 x double> @test11(<2 x double> %x, <2 x double> %y) {
; CHECK-LABEL: @test11
; CHECK-NEXT: %factor = fmul fast <2 x double> %x, <double 2.000000e+00, double 2.000000e+00>
; CHECK-NEXT: %tmp1 = fmul fast <2 x double> %factor, %y
; CHECK-NEXT: ret <2 x double> %tmp1

  %1 = fmul fast <2 x double> %x, %y
  %2 = fmul fast <2 x double> %y, %x
  %3 = fadd fast <2 x double> %1, %2
  ret <2 x double> %3
}

; FIXME: shifts should be converted to mul to assist further reassociation.
define <2 x i64> @test12(<2 x i64> %b, <2 x i64> %c) {
; CHECK-LABEL: @test12
; CHECK-NEXT:  %mul = mul <2 x i64> %c, %b
; CHECK-NEXT:  %shl = shl <2 x i64> %mul, <i64 5, i64 5>
; CHECK-NEXT:  ret <2 x i64> %shl

  %mul = mul <2 x i64> %c, %b
  %shl = shl <2 x i64> %mul, <i64 5, i64 5>
  ret <2 x i64> %shl
}

; FIXME: expressions with a negative const should be canonicalized to assist
; further reassociation.
; We would expect (-5*b)+a -> a-(5*b) but only the constant operand is commuted.
define <4 x float> @test13(<4 x float> %a, <4 x float> %b) {
; CHECK-LABEL: @test13
; CHECK-NEXT:  %mul = fmul fast <4 x float> %b, <float -5.000000e+00, float -5.000000e+00, float -5.000000e+00, float -5.000000e+00>
; CHECK-NEXT:  %add = fadd fast <4 x float> %mul, %a
; CHECK-NEXT:  ret <4 x float> %add

  %mul = fmul fast <4 x float> <float -5.000000e+00, float -5.000000e+00, float -5.000000e+00, float -5.000000e+00>, %b
  %add = fadd fast <4 x float> %mul, %a
  ret <4 x float> %add
}

; Break up subtract to assist further reassociation.
; Check a+b-c -> a+b+-c.
define <2 x i64> @test14(<2 x i64> %a, <2 x i64> %b, <2 x i64> %c) {
; CHECK-LABEL: @test14
; CHECK-NEXT: %add = add <2 x i64> %b, %a
; CHECK-NEXT: %c.neg = sub <2 x i64> zeroinitializer, %c
; CHECK-NEXT: %sub = add <2 x i64> %add, %c.neg
; CHECK-NEXT: ret <2 x i64> %sub

  %add = add <2 x i64> %b, %a
  %sub = sub <2 x i64> %add, %c
  ret <2 x i64> %sub
}

define <2 x i32> @test15(<2 x i32> %x, <2 x i32> %y) {
; CHECK-LABEL: test15
; CHECK-NEXT: %tmp3 = and <2 x i32> %y, %x
; CHECK-NEXT: ret <2 x i32> %tmp3

  %tmp1 = and <2 x i32> %x, %y
  %tmp2 = and <2 x i32> %y, %x
  %tmp3 = and <2 x i32> %tmp1, %tmp2
  ret <2 x i32> %tmp3
}

define <2 x i32> @test16(<2 x i32> %x, <2 x i32> %y) {
; CHECK-LABEL: test16
; CHECK-NEXT: %tmp3 = or <2 x i32> %y, %x
; CHECK-NEXT: ret <2 x i32> %tmp3

  %tmp1 = or <2 x i32> %x, %y
  %tmp2 = or <2 x i32> %y, %x
  %tmp3 = or <2 x i32> %tmp1, %tmp2
  ret <2 x i32> %tmp3
}

; FIXME: Optimize vector xor.  Currently only commute operands.
define <2 x i32> @test17(<2 x i32> %x, <2 x i32> %y) {
; CHECK-LABEL: test17
; CHECK-NEXT: %tmp1 = xor <2 x i32> %x, %y
; CHECK-NEXT: %tmp2 = xor <2 x i32> %x, %y
; CHECK-NEXT: %tmp3 = xor <2 x i32> %tmp1, %tmp2

  %tmp1 = xor <2 x i32> %x, %y
  %tmp2 = xor <2 x i32> %y, %x
  %tmp3 = xor <2 x i32> %tmp1, %tmp2
  ret <2 x i32> %tmp3
}