mirror of
https://github.com/c64scene-ar/llvm-6502.git
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ec9a35a6f9
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47793 91177308-0d34-0410-b5e6-96231b3b80d8
115 lines
2.9 KiB
Plaintext
115 lines
2.9 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 | \
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; RUN: llvm-dis | not grep br
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define i32 @polynomial_constant() {
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; <label>:0
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br label %Loop
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Loop: ; preds = %Loop, %0
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%A1 = phi i32 [ 0, %0 ], [ %A2, %Loop ] ; <i32> [#uses=3]
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%B1 = phi i32 [ 0, %0 ], [ %B2, %Loop ] ; <i32> [#uses=1]
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%A2 = add i32 %A1, 1 ; <i32> [#uses=1]
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%B2 = add i32 %B1, %A1 ; <i32> [#uses=2]
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%C = icmp eq i32 %A1, 1000 ; <i1> [#uses=1]
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br i1 %C, label %Out, label %Loop
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Out: ; preds = %Loop
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ret i32 %B2
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}
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define i32 @NSquare(i32 %N) {
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; <label>:0
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br label %Loop
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Loop: ; preds = %Loop, %0
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%X = phi i32 [ 0, %0 ], [ %X2, %Loop ] ; <i32> [#uses=4]
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%X2 = add i32 %X, 1 ; <i32> [#uses=1]
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%c = icmp eq i32 %X, %N ; <i1> [#uses=1]
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br i1 %c, label %Out, label %Loop
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Out: ; preds = %Loop
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%Y = mul i32 %X, %X ; <i32> [#uses=1]
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ret i32 %Y
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}
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define i32 @NSquareOver2(i32 %N) {
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; <label>:0
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br label %Loop
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Loop: ; preds = %Loop, %0
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%X = phi i32 [ 0, %0 ], [ %X2, %Loop ] ; <i32> [#uses=3]
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%Y = phi i32 [ 15, %0 ], [ %Y2, %Loop ] ; <i32> [#uses=1]
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%Y2 = add i32 %Y, %X ; <i32> [#uses=2]
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%X2 = add i32 %X, 1 ; <i32> [#uses=1]
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%c = icmp eq i32 %X, %N ; <i1> [#uses=1]
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br i1 %c, label %Out, label %Loop
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Out: ; preds = %Loop
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ret i32 %Y2
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}
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define i32 @strength_reduced() {
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; <label>:0
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br label %Loop
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Loop: ; preds = %Loop, %0
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%A1 = phi i32 [ 0, %0 ], [ %A2, %Loop ] ; <i32> [#uses=3]
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%B1 = phi i32 [ 0, %0 ], [ %B2, %Loop ] ; <i32> [#uses=1]
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%A2 = add i32 %A1, 1 ; <i32> [#uses=1]
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%B2 = add i32 %B1, %A1 ; <i32> [#uses=2]
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%C = icmp eq i32 %A1, 1000 ; <i1> [#uses=1]
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br i1 %C, label %Out, label %Loop
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Out: ; preds = %Loop
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ret i32 %B2
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}
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define i32 @chrec_equals() {
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entry:
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br label %no_exit
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no_exit: ; preds = %no_exit, %entry
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%i0 = phi i32 [ 0, %entry ], [ %i1, %no_exit ] ; <i32> [#uses=3]
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%ISq = mul i32 %i0, %i0 ; <i32> [#uses=1]
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%i1 = add i32 %i0, 1 ; <i32> [#uses=2]
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%tmp.1 = icmp ne i32 %ISq, 10000 ; <i1> [#uses=1]
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br i1 %tmp.1, label %no_exit, label %loopexit
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loopexit: ; preds = %no_exit
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ret i32 %i1
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}
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define i16 @cast_chrec_test() {
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; <label>:0
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br label %Loop
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Loop: ; preds = %Loop, %0
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%A1 = phi i32 [ 0, %0 ], [ %A2, %Loop ] ; <i32> [#uses=2]
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%B1 = trunc i32 %A1 to i16 ; <i16> [#uses=2]
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%A2 = add i32 %A1, 1 ; <i32> [#uses=1]
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%C = icmp eq i16 %B1, 1000 ; <i1> [#uses=1]
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br i1 %C, label %Out, label %Loop
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Out: ; preds = %Loop
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ret i16 %B1
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}
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define i32 @linear_div_fold() {
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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 [ 4, %entry ], [ %i.next, %loop ] ; <i32> [#uses=3]
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%i.next = add i32 %i, 8 ; <i32> [#uses=1]
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%RV = udiv i32 %i, 2 ; <i32> [#uses=1]
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%c = icmp ne i32 %i, 68 ; <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 %RV
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}
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