derek.holloway
7502bf64a4
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57 lines
2.8 KiB
LLVM
57 lines
2.8 KiB
LLVM
; This testcase is distilled from the GNU rx package. The loop should be
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; removed but causes a problem when ADCE does. The source function is:
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; int rx_bitset_empty (int size, rx_Bitset set) {
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; int x;
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; RX_subset s;
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; s = set[0];
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; set[0] = 1;
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; for (x = rx_bitset_numb_subsets(size) - 1; !set[x]; --x)
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; ;
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; set[0] = s;
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; return !s;
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;}
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;
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; RUN: opt < %s -passes=adce
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; RUN: opt < %s -passes=adce -adce-remove-loops -S | FileCheck %s
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define i32 @rx_bitset_empty(i32 %size, ptr %set) {
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bb1:
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%reg110 = load i32, ptr %set ; <i32> [#uses=2]
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store i32 1, ptr %set
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%cast112 = sext i32 %size to i64 ; <i64> [#uses=1]
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%reg113 = add i64 %cast112, 31 ; <i64> [#uses=1]
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%reg114 = lshr i64 %reg113, 5 ; <i64> [#uses=2]
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%cast109 = trunc i64 %reg114 to i32 ; <i32> [#uses=1]
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%reg129 = add i32 %cast109, -1 ; <i32> [#uses=1]
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%reg114-idxcast = trunc i64 %reg114 to i32 ; <i32> [#uses=1]
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%reg114-idxcast-offset = add i32 %reg114-idxcast, 1073741823 ; <i32> [#uses=1]
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%reg114-idxcast-offset.upgrd.1 = zext i32 %reg114-idxcast-offset to i64 ; <i64> [#uses=1]
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%reg124 = getelementptr i32, ptr %set, i64 %reg114-idxcast-offset.upgrd.1 ; <ptr> [#uses=1]
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%reg125 = load i32, ptr %reg124 ; <i32> [#uses=1]
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%cond232 = icmp ne i32 %reg125, 0 ; <i1> [#uses=1]
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; CHECK: br label %bb3
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br i1 %cond232, label %bb3, label %bb2
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bb2: ; preds = %bb2, %bb1
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%cann-indvar = phi i32 [ 0, %bb1 ], [ %add1-indvar, %bb2 ] ; <i32> [#uses=2]
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%reg130-scale = mul i32 %cann-indvar, -1 ; <i32> [#uses=1]
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%reg130 = add i32 %reg130-scale, %reg129 ; <i32> [#uses=1]
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%add1-indvar = add i32 %cann-indvar, 1 ; <i32> [#uses=1]
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%reg130-idxcast = bitcast i32 %reg130 to i32 ; <i32> [#uses=1]
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%reg130-idxcast-offset = add i32 %reg130-idxcast, 1073741823 ; <i32> [#uses=1]
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%reg130-idxcast-offset.upgrd.2 = zext i32 %reg130-idxcast-offset to i64 ; <i64> [#uses=1]
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%reg118 = getelementptr i32, ptr %set, i64 %reg130-idxcast-offset.upgrd.2 ; <ptr> [#uses=1]
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%reg119 = load i32, ptr %reg118 ; <i32> [#uses=1]
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%cond233 = icmp eq i32 %reg119, 0 ; <i1> [#uses=1]
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br i1 %cond233, label %bb2, label %bb3
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bb3: ; preds = %bb2, %bb1
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store i32 %reg110, ptr %set
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%cast126 = zext i32 %reg110 to i64 ; <i64> [#uses=1]
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%reg127 = add i64 %cast126, -1 ; <i64> [#uses=1]
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%reg128 = lshr i64 %reg127, 63 ; <i64> [#uses=1]
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%cast120 = trunc i64 %reg128 to i32 ; <i32> [#uses=1]
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ret i32 %cast120
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}
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