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101 lines
2.6 KiB
LLVM
101 lines
2.6 KiB
LLVM
; 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 -loop-deletion -simplifycfg | llvm-dis | not grep br
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define i32 @linear_setne() {
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entry:
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br label %loop
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loop: ; preds = %loop, %entry
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%i = phi i32 [ 0, %entry ], [ %i.next, %loop ] ; <i32> [#uses=3]
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%i.next = add i32 %i, 1 ; <i32> [#uses=1]
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%c = icmp ne i32 %i, 100 ; <i1> [#uses=1]
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br i1 %c, label %loop, label %loopexit
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loopexit: ; preds = %loop
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ret i32 %i
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}
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define i32 @linear_setne_2() {
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entry:
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br label %loop
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loop: ; preds = %loop, %entry
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%i = phi i32 [ 0, %entry ], [ %i.next, %loop ] ; <i32> [#uses=3]
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%i.next = add i32 %i, 2 ; <i32> [#uses=1]
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%c = icmp ne i32 %i, 100 ; <i1> [#uses=1]
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br i1 %c, label %loop, label %loopexit
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loopexit: ; preds = %loop
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ret i32 %i
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}
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define i32 @linear_setne_overflow() {
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entry:
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br label %loop
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loop: ; preds = %loop, %entry
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%i = phi i32 [ 1024, %entry ], [ %i.next, %loop ] ; <i32> [#uses=3]
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%i.next = add i32 %i, 1024 ; <i32> [#uses=1]
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%c = icmp ne i32 %i, 0 ; <i1> [#uses=1]
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br i1 %c, label %loop, label %loopexit
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loopexit: ; preds = %loop
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ret i32 %i
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}
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define i32 @linear_setlt() {
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entry:
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br label %loop
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loop: ; preds = %loop, %entry
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%i = phi i32 [ 0, %entry ], [ %i.next, %loop ] ; <i32> [#uses=3]
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%i.next = add i32 %i, 1 ; <i32> [#uses=1]
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%c = icmp slt i32 %i, 100 ; <i1> [#uses=1]
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br i1 %c, label %loop, label %loopexit
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loopexit: ; preds = %loop
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ret i32 %i
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}
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define i32 @quadratic_setlt() {
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entry:
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br label %loop
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loop: ; preds = %loop, %entry
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%i = phi i32 [ 7, %entry ], [ %i.next, %loop ] ; <i32> [#uses=4]
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%i.next = add i32 %i, 3 ; <i32> [#uses=1]
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%i2 = mul i32 %i, %i ; <i32> [#uses=1]
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%c = icmp slt i32 %i2, 1000 ; <i1> [#uses=1]
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br i1 %c, label %loop, label %loopexit
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loopexit: ; preds = %loop
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ret i32 %i
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}
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define i32 @chained() {
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entry:
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br label %loop
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loop: ; preds = %loop, %entry
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%i = phi i32 [ 0, %entry ], [ %i.next, %loop ] ; <i32> [#uses=3]
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%i.next = add i32 %i, 1 ; <i32> [#uses=1]
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%c = icmp ne i32 %i, 100 ; <i1> [#uses=1]
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br i1 %c, label %loop, label %loopexit
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loopexit: ; preds = %loop
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br label %loop2
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loop2: ; preds = %loop2, %loopexit
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%j = phi i32 [ %i, %loopexit ], [ %j.next, %loop2 ] ; <i32> [#uses=3]
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%j.next = add i32 %j, 1 ; <i32> [#uses=1]
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%c2 = icmp ne i32 %j, 200 ; <i1> [#uses=1]
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br i1 %c2, label %loop2, label %loopexit2
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loopexit2: ; preds = %loop2
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ret i32 %j
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}
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