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4d5ef8fb85
We sometimes create intermediate subtract instructions during reassociation. Adding these to the worklist to revisit exposes many additional reassociation opportunities. Patch by Aditya Nandakumar. llvm-svn: 253240
220 lines
7.3 KiB
LLVM
220 lines
7.3 KiB
LLVM
; RUN: opt < %s -reassociate -S | FileCheck %s
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; Check that a*c+b*c is turned into (a+b)*c
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define <4 x float> @test1(<4 x float> %a, <4 x float> %b, <4 x float> %c) {
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; CHECK-LABEL: @test1
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; CHECK-NEXT: %tmp = fadd fast <4 x float> %b, %a
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; CHECK-NEXT: %tmp1 = fmul fast <4 x float> %tmp, %c
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; CHECK-NEXT: ret <4 x float> %tmp1
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%mul = fmul fast <4 x float> %a, %c
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%mul1 = fmul fast <4 x float> %b, %c
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%add = fadd fast <4 x float> %mul, %mul1
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ret <4 x float> %add
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}
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; Check that a*a*b+a*a*c is turned into a*(a*(b+c)).
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define <2 x float> @test2(<2 x float> %a, <2 x float> %b, <2 x float> %c) {
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; CHECK-LABEL: @test2
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; CHECK-NEXT: [[TMP1:%tmp.*]] = fadd fast <2 x float> %c, %b
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; CHECK-NEXT: [[TMP2:%tmp.*]] = fmul fast <2 x float> %a, %a
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; CHECK-NEXT: fmul fast <2 x float> [[TMP2]], [[TMP1]]
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; CHECK-NEXT: ret <2 x float>
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%t0 = fmul fast <2 x float> %a, %b
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%t1 = fmul fast <2 x float> %a, %t0
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%t2 = fmul fast <2 x float> %a, %c
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%t3 = fmul fast <2 x float> %a, %t2
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%t4 = fadd fast <2 x float> %t1, %t3
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ret <2 x float> %t4
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}
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; Check that a*b+a*c+d is turned into a*(b+c)+d.
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define <2 x double> @test3(<2 x double> %a, <2 x double> %b, <2 x double> %c, <2 x double> %d) {
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; CHECK-LABEL: @test3
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; CHECK-NEXT: fadd fast <2 x double> %c, %b
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; CHECK-NEXT: fmul fast <2 x double> %tmp, %a
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; CHECK-NEXT: fadd fast <2 x double> %tmp1, %d
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; CHECK-NEXT: ret <2 x double>
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%t0 = fmul fast <2 x double> %a, %b
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%t1 = fmul fast <2 x double> %a, %c
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%t2 = fadd fast <2 x double> %t1, %d
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%t3 = fadd fast <2 x double> %t0, %t2
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ret <2 x double> %t3
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}
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; No fast-math.
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define <2 x float> @test4(<2 x float> %A) {
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; CHECK-LABEL: @test4
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; CHECK-NEXT: %X = fadd <2 x float> %A, <float 1.000000e+00, float 1.000000e+00>
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; CHECK-NEXT: %Y = fadd <2 x float> %A, <float 1.000000e+00, float 1.000000e+00>
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; CHECK-NEXT: %R = fsub <2 x float> %X, %Y
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; CHECK-NEXT: ret <2 x float> %R
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%X = fadd <2 x float> %A, < float 1.000000e+00, float 1.000000e+00 >
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%Y = fadd <2 x float> %A, < float 1.000000e+00, float 1.000000e+00 >
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%R = fsub <2 x float> %X, %Y
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ret <2 x float> %R
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}
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; Check 47*X + 47*X -> 94*X.
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define <2 x float> @test5(<2 x float> %X) {
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; CHECK-LABEL: @test5
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; CHECK-NEXT: fmul fast <2 x float> %X, <float 9.400000e+01, float 9.400000e+01>
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; CHECK-NEXT: ret <2 x float>
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%Y = fmul fast <2 x float> %X, <float 4.700000e+01, float 4.700000e+01>
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%Z = fadd fast <2 x float> %Y, %Y
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ret <2 x float> %Z
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}
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; Check X+X+X -> 3*X.
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define <2 x float> @test6(<2 x float> %X) {
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; CHECK-LABEL: @test6
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; CHECK-NEXT: fmul fast <2 x float> %X, <float 3.000000e+00, float 3.000000e+00>
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; CHECK-NEXT: ret <2 x float>
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%Y = fadd fast <2 x float> %X ,%X
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%Z = fadd fast <2 x float> %Y, %X
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ret <2 x float> %Z
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}
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; Check 127*W+50*W -> 177*W.
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define <2 x double> @test7(<2 x double> %W) {
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; CHECK-LABEL: @test7
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; CHECK-NEXT: fmul fast <2 x double> %W, <double 1.770000e+02, double 1.770000e+02>
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; CHECK-NEXT: ret <2 x double>
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%X = fmul fast <2 x double> %W, <double 127.0, double 127.0>
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%Y = fmul fast <2 x double> %W, <double 50.0, double 50.0>
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%Z = fadd fast <2 x double> %Y, %X
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ret <2 x double> %Z
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}
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; Check X*12*12 -> X*144.
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define <2 x float> @test8(<2 x float> %arg) {
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; CHECK-LABEL: @test8
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; CHECK: fmul fast <2 x float> %arg, <float 1.440000e+02, float 1.440000e+02>
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; CHECK-NEXT: ret <2 x float> %tmp2
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%tmp1 = fmul fast <2 x float> <float 1.200000e+01, float 1.200000e+01>, %arg
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%tmp2 = fmul fast <2 x float> %tmp1, <float 1.200000e+01, float 1.200000e+01>
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ret <2 x float> %tmp2
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}
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; Check (b+(a+1234))+-a -> b+1234.
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define <2 x double> @test9(<2 x double> %b, <2 x double> %a) {
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; CHECK-LABEL: @test9
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; CHECK: fadd fast <2 x double> %b, <double 1.234000e+03, double 1.234000e+03>
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; CHECK-NEXT: ret <2 x double>
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%1 = fadd fast <2 x double> %a, <double 1.234000e+03, double 1.234000e+03>
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%2 = fadd fast <2 x double> %b, %1
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%3 = fsub fast <2 x double> <double 0.000000e+00, double 0.000000e+00>, %a
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%4 = fadd fast <2 x double> %2, %3
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ret <2 x double> %4
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}
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; Check -(-(z*40)*a) -> a*40*z.
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define <2 x float> @test10(<2 x float> %a, <2 x float> %b, <2 x float> %z) {
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; CHECK-LABEL: @test10
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; CHECK: fmul fast <2 x float> %a, <float 4.000000e+01, float 4.000000e+01>
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; CHECK-NEXT: fmul fast <2 x float> %e, %z
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; CHECK-NEXT: ret <2 x float>
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%d = fmul fast <2 x float> %z, <float 4.000000e+01, float 4.000000e+01>
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%c = fsub fast <2 x float> <float 0.000000e+00, float 0.000000e+00>, %d
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%e = fmul fast <2 x float> %a, %c
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%f = fsub fast <2 x float> <float 0.000000e+00, float 0.000000e+00>, %e
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ret <2 x float> %f
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}
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; Check x*y+y*x -> x*y*2.
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define <2 x double> @test11(<2 x double> %x, <2 x double> %y) {
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; CHECK-LABEL: @test11
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; CHECK-NEXT: %factor = fmul fast <2 x double> %x, <double 2.000000e+00, double 2.000000e+00>
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; CHECK-NEXT: %tmp1 = fmul fast <2 x double> %factor, %y
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; CHECK-NEXT: ret <2 x double> %tmp1
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%1 = fmul fast <2 x double> %x, %y
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%2 = fmul fast <2 x double> %y, %x
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%3 = fadd fast <2 x double> %1, %2
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ret <2 x double> %3
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}
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; FIXME: shifts should be converted to mul to assist further reassociation.
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define <2 x i64> @test12(<2 x i64> %b, <2 x i64> %c) {
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; CHECK-LABEL: @test12
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; CHECK-NEXT: %mul = mul <2 x i64> %c, %b
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; CHECK-NEXT: %shl = shl <2 x i64> %mul, <i64 5, i64 5>
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; CHECK-NEXT: ret <2 x i64> %shl
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%mul = mul <2 x i64> %c, %b
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%shl = shl <2 x i64> %mul, <i64 5, i64 5>
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ret <2 x i64> %shl
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}
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; FIXME: expressions with a negative const should be canonicalized to assist
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; further reassociation.
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; We would expect (-5*b)+a -> a-(5*b) but only the constant operand is commuted.
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define <4 x float> @test13(<4 x float> %a, <4 x float> %b) {
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; CHECK-LABEL: @test13
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; 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>
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; CHECK-NEXT: %add = fadd fast <4 x float> %mul, %a
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; CHECK-NEXT: ret <4 x float> %add
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%mul = fmul fast <4 x float> <float -5.000000e+00, float -5.000000e+00, float -5.000000e+00, float -5.000000e+00>, %b
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%add = fadd fast <4 x float> %mul, %a
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ret <4 x float> %add
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}
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; Break up subtract to assist further reassociation.
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; Check a+b-c -> a+b+-c.
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define <2 x i64> @test14(<2 x i64> %a, <2 x i64> %b, <2 x i64> %c) {
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; CHECK-LABEL: @test14
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; CHECK-NEXT: %add = add <2 x i64> %b, %a
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; CHECK-NEXT: %c.neg = sub <2 x i64> zeroinitializer, %c
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; CHECK-NEXT: %sub = add <2 x i64> %add, %c.neg
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; CHECK-NEXT: ret <2 x i64> %sub
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%add = add <2 x i64> %b, %a
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%sub = sub <2 x i64> %add, %c
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ret <2 x i64> %sub
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}
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define <2 x i32> @test15(<2 x i32> %x, <2 x i32> %y) {
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; CHECK-LABEL: test15
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; CHECK-NEXT: %tmp3 = and <2 x i32> %y, %x
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; CHECK-NEXT: ret <2 x i32> %tmp3
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%tmp1 = and <2 x i32> %x, %y
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%tmp2 = and <2 x i32> %y, %x
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%tmp3 = and <2 x i32> %tmp1, %tmp2
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ret <2 x i32> %tmp3
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}
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define <2 x i32> @test16(<2 x i32> %x, <2 x i32> %y) {
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; CHECK-LABEL: test16
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; CHECK-NEXT: %tmp3 = or <2 x i32> %y, %x
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; CHECK-NEXT: ret <2 x i32> %tmp3
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%tmp1 = or <2 x i32> %x, %y
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%tmp2 = or <2 x i32> %y, %x
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%tmp3 = or <2 x i32> %tmp1, %tmp2
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ret <2 x i32> %tmp3
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}
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; FIXME: Optimize vector xor. Currently only commute operands.
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define <2 x i32> @test17(<2 x i32> %x, <2 x i32> %y) {
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; CHECK-LABEL: test17
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; CHECK-NEXT: %tmp1 = xor <2 x i32> %x, %y
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; CHECK-NEXT: %tmp2 = xor <2 x i32> %x, %y
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; CHECK-NEXT: %tmp3 = xor <2 x i32> %tmp1, %tmp2
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%tmp1 = xor <2 x i32> %x, %y
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%tmp2 = xor <2 x i32> %y, %x
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%tmp3 = xor <2 x i32> %tmp1, %tmp2
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ret <2 x i32> %tmp3
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}
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