derek.holloway
7502bf64a4
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51 lines
1.9 KiB
LLVM
51 lines
1.9 KiB
LLVM
; RUN: opt < %s -S -passes='loop(indvars),loop-unroll' | FileCheck %s
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;
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; loop-unroll fully unrolls the inner loop, creating an interesting
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; chain of multiplication. indvars forces SCEV to run again on the
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; outer loop. While reducing the recurrence at %mul3, unsigned integer overflow
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; causes one of the terms to reach zero. This forces all multiples in
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; the recurrence to be zero, reducing the whole thing to a constant expression.
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;
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; PR12929: cast<Ty>() argument of incompatible type
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
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declare void @use(i8 %x)
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; CHECK: @func
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; CHECK: for.cond:
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; CHECK: %inc1 = phi i8 [ 0, %entry ], [ %0, %for.body ]
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; CHECK: br label %for.body
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; CHECK: for.body:
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; CHECK: %inc.9 = add i8 %inc1, 10
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; CHECK: %0 = add i8 %inc1, 10
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; CHECK: br label %for.cond
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define void @func() noreturn nounwind uwtable ssp {
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entry:
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br label %for.cond
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for.cond.loopexit: ; preds = %for.body
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%mul.lcssa = phi i8 [ %mul, %for.body ]
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%0 = add i8 %inc1, 10
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%indvars.iv.next = add i8 %indvars.iv, 10
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br label %for.cond
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for.cond: ; preds = %for.cond.loopexit, %entry
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%indvars.iv = phi i8 [ %indvars.iv.next, %for.cond.loopexit ], [ 10, %entry ]
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%mul3 = phi i8 [ undef, %entry ], [ %mul.lcssa, %for.cond.loopexit ]
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%inc1 = phi i8 [ 0, %entry ], [ %0, %for.cond.loopexit ]
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call void @use(i8 %inc1)
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br label %for.body
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for.body: ; preds = %for.body, %for.cond
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%inc26 = phi i8 [ %inc1, %for.cond ], [ %inc, %for.body ]
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%mul45 = phi i8 [ %mul3, %for.cond ], [ %mul, %for.body ]
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%inc = add i8 %inc26, 1
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%mul = mul i8 %inc26, %mul45
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call void @use(i8 %inc)
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%exitcond = icmp ne i8 %inc, %indvars.iv
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br i1 %exitcond, label %for.body, label %for.cond.loopexit
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}
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