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63 lines
2.1 KiB
63 lines
2.1 KiB
4 months ago
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; RUN: opt -march=hexagon -hexagon-loop-idiom -S < %s | FileCheck %s
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;
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; The number of nested selects caused the simplification loop to take
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; more than the maximum number of iterations. This caused the compiler
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; to crash under suspicion of an infinite loop. This (still reduced)
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; testcase shows a legitimate case where this limit was exceeded.
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; Instead of crashing, gracefully abort the simplification.
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;
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; Check for sane output.
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; CHECK: define void @fred
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target datalayout = "e-m:e-p:32:32:32-a:0-n16:32-i64:64:64-i32:32:32-i16:16:16-i1:8:8-f32:32:32-f64:64:64-v32:32:32-v64:64:64-v512:512:512-v1024:1024:1024-v2048:2048:2048"
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target triple = "hexagon"
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define void @fred() unnamed_addr #0 {
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b0:
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%v1 = select i1 false, i32 undef, i32 2
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br label %b2
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b2: ; preds = %b2, %b0
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%v3 = sext i16 undef to i32
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%v4 = add nsw i32 %v1, %v3
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%v5 = select i1 undef, i32 undef, i32 %v4
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%v6 = icmp slt i32 %v5, undef
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%v7 = select i1 %v6, i32 %v5, i32 undef
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%v8 = icmp slt i32 %v7, 0
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%v9 = select i1 %v8, i32 %v7, i32 0
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%v10 = sub i32 undef, undef
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%v11 = add i32 %v10, %v9
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%v12 = sext i16 undef to i32
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%v13 = sext i16 undef to i32
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%v14 = add nsw i32 %v1, %v13
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%v15 = select i1 undef, i32 undef, i32 %v14
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%v16 = icmp slt i32 %v15, undef
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%v17 = select i1 %v16, i32 %v15, i32 undef
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%v18 = select i1 undef, i32 %v17, i32 %v12
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%v19 = add i32 undef, %v18
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%v20 = sext i16 undef to i32
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%v21 = sext i16 0 to i32
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%v22 = add nsw i32 %v1, %v21
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%v23 = sext i16 undef to i32
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%v24 = add nsw i32 %v1, %v23
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%v25 = select i1 undef, i32 undef, i32 %v24
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%v26 = icmp slt i32 %v25, %v22
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%v27 = select i1 %v26, i32 %v25, i32 %v22
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%v28 = icmp slt i32 %v27, %v20
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%v29 = select i1 %v28, i32 %v27, i32 %v20
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%v30 = add i32 undef, %v29
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%v31 = add i32 %v11, undef
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%v32 = add i32 %v31, undef
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%v33 = add i32 %v32, %v19
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%v34 = add i32 %v33, %v30
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%v35 = add nsw i32 %v34, 32768
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%v36 = icmp ult i32 %v35, 65536
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%v37 = select i1 %v36, i32 %v34, i32 undef
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br i1 undef, label %b2, label %b38
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b38: ; preds = %b2
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unreachable
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}
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attributes #0 = { "target-cpu"="hexagonv60" }
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