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103 lines
2.4 KiB
Plaintext
103 lines
2.4 KiB
Plaintext
; Test that we can evaluate the exit values of various expression types. Since
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; these loops all have predictable exit values we can replace the use outside
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; of the loop with a closed-form computation, making the loop dead.
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;
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; RUN: llvm-as < %s | opt -indvars -adce -simplifycfg | llvm-dis | not grep br
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int %polynomial_constant() {
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br label %Loop
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Loop:
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%A1 = phi int [0, %0], [%A2, %Loop]
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%B1 = phi int [0, %0], [%B2, %Loop]
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%A2 = add int %A1, 1
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%B2 = add int %B1, %A1
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%C = seteq int %A1, 1000
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br bool %C, label %Out, label %Loop
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Out:
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ret int %B2
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}
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int %NSquare(int %N) {
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br label %Loop
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Loop:
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%X = phi int [0, %0], [%X2, %Loop]
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%X2 = add int %X, 1
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%c = seteq int %X, %N
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br bool %c, label %Out, label %Loop
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Out:
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%Y = mul int %X, %X
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ret int %Y
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}
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int %NSquareOver2(int %N) {
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br label %Loop
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Loop:
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%X = phi int [0, %0], [%X2, %Loop]
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%Y = phi int [15, %0], [%Y2, %Loop] ;; include offset of 15 for yuks
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%Y2 = add int %Y, %X
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%X2 = add int %X, 1
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%c = seteq int %X, %N
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br bool %c, label %Out, label %Loop
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Out:
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ret int %Y2
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}
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int %strength_reduced() {
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br label %Loop
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Loop:
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%A1 = phi int [0, %0], [%A2, %Loop]
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%B1 = phi int [0, %0], [%B2, %Loop]
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%A2 = add int %A1, 1
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%B2 = add int %B1, %A1
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%C = seteq int %A1, 1000
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br bool %C, label %Out, label %Loop
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Out:
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ret int %B2
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}
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int %chrec_equals() {
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entry:
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br label %no_exit
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no_exit:
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%i0 = phi int [ 0, %entry ], [ %i1, %no_exit ]
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%ISq = mul int %i0, %i0
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%i1 = add int %i0, 1
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%tmp.1 = setne int %ISq, 10000 ; while (I*I != 1000)
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br bool %tmp.1, label %no_exit, label %loopexit
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loopexit:
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ret int %i1
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}
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;; We should recognize B1 as being a recurrence, allowing us to compute the
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;; trip count and eliminate the loop.
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short %cast_chrec_test() {
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br label %Loop
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Loop:
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%A1 = phi int [0, %0], [%A2, %Loop]
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%B1 = cast int %A1 to short
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%A2 = add int %A1, 1
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%C = seteq short %B1, 1000
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br bool %C, label %Out, label %Loop
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Out:
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ret short %B1
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}
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uint %linear_div_fold() { ;; for (i = 4; i != 68; i += 8) (exit with i/2)
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entry:
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br label %loop
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loop:
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%i = phi uint [ 4, %entry ], [ %i.next, %loop ]
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%i.next = add uint %i, 8
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%RV = div uint %i, 2
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%c = setne uint %i, 68
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br bool %c, label %loop, label %loopexit
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loopexit:
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ret uint %RV
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}
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