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91 lines
2.2 KiB
Plaintext
91 lines
2.2 KiB
Plaintext
; These tests ensure that we can compute the trip count of various forms of
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; loops. If the trip count of the loop is computable, then we will know what
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; the exit value of the loop will be for some value, allowing us to substitute
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; it directly into users outside of the loop, 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 %linear_setne() { ;; for (i = 0; i != 100; ++i)
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entry:
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br label %loop
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loop:
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%i = phi int [ 0, %entry ], [ %i.next, %loop ]
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%i.next = add int %i, 1
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%c = setne int %i, 100
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br bool %c, label %loop, label %loopexit
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loopexit:
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ret int %i
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}
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int %linear_setne_2() { ;; for (i = 0; i != 100; 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 int [ 0, %entry ], [ %i.next, %loop ]
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%i.next = add int %i, 2
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%c = setne int %i, 100
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br bool %c, label %loop, label %loopexit
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loopexit:
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ret int %i
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}
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int %linear_setne_overflow() { ;; for (i = 1024; i != 0; i += 1024)
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entry:
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br label %loop
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loop:
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%i = phi int [ 1024, %entry ], [ %i.next, %loop ]
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%i.next = add int %i, 1024
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%c = setne int %i, 0
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br bool %c, label %loop, label %loopexit
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loopexit:
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ret int %i
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}
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int %linear_setlt() { ;; for (i = 0; i < 100; ++i)
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entry:
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br label %loop
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loop:
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%i = phi int [ 0, %entry ], [ %i.next, %loop ]
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%i.next = add int %i, 1
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%c = setlt int %i, 100
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br bool %c, label %loop, label %loopexit
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loopexit:
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ret int %i
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}
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int %quadratic_setlt() { ;; for (i = 7; i*i < 1000; i+=3)
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entry:
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br label %loop
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loop:
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%i = phi int [ 7, %entry ], [ %i.next, %loop ]
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%i.next = add int %i, 3
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%i2 = mul int %i, %i
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%c = setlt int %i2, 1000
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br bool %c, label %loop, label %loopexit
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loopexit:
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ret int %i
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}
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;; Chained loop test - The exit value of the second loop depends on the exit
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;; value of the first being computed.
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int %chained() {
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entry:
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br label %loop
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loop: ;; for (i = 0; i != 100; ++i)
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%i = phi int [ 0, %entry ], [ %i.next, %loop ]
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%i.next = add int %i, 1
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%c = setne int %i, 100
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br bool %c, label %loop, label %loopexit
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loopexit:
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br label %loop2
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loop2: ;; for (j = i; j != 200; ++j)
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%j = phi int [ %i, %loopexit ], [ %j.next, %loop2 ]
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%j.next = add int %j, 1
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%c2 = setne int %j, 200
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br bool %c2, label %loop2, label %loopexit2
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loopexit2:
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ret int %j
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}
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