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2d1be87ee4
have pointer types, though in contrast to C pointer types, SCEV addition is never implicitly scaled. This not only eliminates the need for special code like IndVars' EliminatePointerRecurrence and LSR's own GEP expansion code, it also does a better job because it lets the normal optimizations handle pointer expressions just like integer expressions. Also, since LLVM IR GEPs can't directly index into multi-dimensional VLAs, moving the GEP analysis out of client code and into the SCEV framework makes it easier for clients to handle multi-dimensional VLAs the same way as other arrays. Some existing regression tests show improved optimization. test/CodeGen/ARM/2007-03-13-InstrSched.ll in particular improved to the point where if-conversion started kicking in; I turned it off for this test to preserve the intent of the test. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@69258 91177308-0d34-0410-b5e6-96231b3b80d8
35 lines
1.1 KiB
LLVM
35 lines
1.1 KiB
LLVM
; RUN: llvm-as < %s | llc -march=x86 -relocation-model=static | not grep lea
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; RUN: llvm-as < %s | llc -march=x86-64 | not grep lea
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; P should be sunk into the loop and folded into the address mode. There
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; shouldn't be any lea instructions inside the loop.
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@B = external global [1000 x i8], align 32
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@A = external global [1000 x i8], align 32
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@P = external global [1000 x i8], align 32
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define void @foo(i32 %m, i32 %p) nounwind {
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entry:
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%tmp1 = icmp sgt i32 %m, 0
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br i1 %tmp1, label %bb, label %return
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bb:
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%i.019.0 = phi i32 [ %indvar.next, %bb ], [ 0, %entry ]
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%tmp2 = getelementptr [1000 x i8]* @B, i32 0, i32 %i.019.0
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%tmp3 = load i8* %tmp2, align 4
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%tmp4 = mul i8 %tmp3, 2
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%tmp5 = getelementptr [1000 x i8]* @A, i32 0, i32 %i.019.0
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store i8 %tmp4, i8* %tmp5, align 4
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%tmp8 = mul i32 %i.019.0, 9
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%tmp0 = add i32 %tmp8, %p
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%tmp10 = getelementptr [1000 x i8]* @P, i32 0, i32 %tmp0
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store i8 17, i8* %tmp10, align 4
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%indvar.next = add i32 %i.019.0, 1
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%exitcond = icmp eq i32 %indvar.next, %m
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br i1 %exitcond, label %return, label %bb
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return:
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ret void
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}
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