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07f763034a
After the loop unroll threshold was increased in r295538, very large constant expressions can be created. This prevents them from having to be recursively scanned, leading to a compile time blow-up. Differential Revision: https://reviews.llvm.org/D30689 llvm-svn: 298356
74 lines
2.8 KiB
LLVM
74 lines
2.8 KiB
LLVM
; NOTE: This is a timeout test for some O(something silly) constant folding behaviour. It may not be the best test. Providing it finishes, it passes.
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; RUN: opt < %s -O3 -S | FileCheck %s
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target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
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target triple = "armv8-none-eabi"
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%struct.ST = type { %struct.ST* }
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@global = internal global [121 x i8] zeroinitializer, align 1
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define void @func() #0 {
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;CHECK-LABEL: func
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entry:
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%s = alloca %struct.ST*, align 4
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%j = alloca i32, align 4
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store %struct.ST* bitcast ([121 x i8]* @global to %struct.ST*), %struct.ST** %s, align 4
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store i32 0, i32* %j, align 4
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br label %for.cond
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for.cond: ; preds = %for.inc, %entry
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%0 = load i32, i32* %j, align 4
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%cmp = icmp slt i32 %0, 30
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br i1 %cmp, label %for.body, label %for.end
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for.body: ; preds = %for.cond
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%1 = load %struct.ST*, %struct.ST** %s, align 4
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%2 = bitcast %struct.ST* %1 to i8*
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%add.ptr = getelementptr inbounds i8, i8* %2, i32 4
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%3 = ptrtoint i8* %add.ptr to i32
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%4 = load %struct.ST*, %struct.ST** %s, align 4
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%5 = bitcast %struct.ST* %4 to i8*
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%add.ptr1 = getelementptr inbounds i8, i8* %5, i32 4
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%6 = ptrtoint i8* %add.ptr1 to i32
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%rem = urem i32 %6, 2
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%cmp2 = icmp eq i32 %rem, 0
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br i1 %cmp2, label %cond.true, label %cond.false
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cond.true: ; preds = %for.body
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br label %cond.end
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cond.false: ; preds = %for.body
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%7 = load %struct.ST*, %struct.ST** %s, align 4
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%8 = bitcast %struct.ST* %7 to i8*
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%add.ptr3 = getelementptr inbounds i8, i8* %8, i32 4
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%9 = ptrtoint i8* %add.ptr3 to i32
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%rem4 = urem i32 %9, 2
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br label %cond.end
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cond.end: ; preds = %cond.false, %cond.true
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%cond = phi i32 [ 0, %cond.true ], [ %rem4, %cond.false ]
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%add = add i32 %3, %cond
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%10 = inttoptr i32 %add to %struct.ST*
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%11 = load %struct.ST*, %struct.ST** %s, align 4
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%next = getelementptr inbounds %struct.ST, %struct.ST* %11, i32 0, i32 0
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store %struct.ST* %10, %struct.ST** %next, align 4
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%12 = load %struct.ST*, %struct.ST** %s, align 4
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%next5 = getelementptr inbounds %struct.ST, %struct.ST* %12, i32 0, i32 0
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%13 = load %struct.ST*, %struct.ST** %next5, align 4
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store %struct.ST* %13, %struct.ST** %s, align 4
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br label %for.inc
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for.inc: ; preds = %cond.end
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%14 = load i32, i32* %j, align 4
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%inc = add nsw i32 %14, 1
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store i32 %inc, i32* %j, align 4
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br label %for.cond
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for.end: ; preds = %for.cond
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%15 = load %struct.ST*, %struct.ST** %s, align 4
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%next6 = getelementptr inbounds %struct.ST, %struct.ST* %15, i32 0, i32 0
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store %struct.ST* null, %struct.ST** %next6, align 4
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ret void
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}
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