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