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4d8414f420
induction variable when the addrec to be expanded does not require a wider type. This eliminates the need for IndVarSimplify to micro-manage SCEV expansions, because SCEVExpander now automatically expands them in the form that IndVarSimplify considers to be canonical. (LSR still micro-manages its SCEV expansions, because it's optimizing for the target, rather than for other optimizations.) Also, this uses the new getAnyExtendExpr, which has more clever expression simplification logic than the IndVarSimplify code it replaces, and this cleans up some ugly expansions in code such as the included masked-iv.ll testcase. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73294 91177308-0d34-0410-b5e6-96231b3b80d8
25 lines
730 B
LLVM
25 lines
730 B
LLVM
; RUN: llvm-as < %s | opt -indvars | llvm-dis | grep trunc | count 1
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; Indvars should do the IV arithmetic in the canonical IV type (i64),
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; and only use one truncation.
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define void @foo(i64* %A, i64* %B, i64 %n, i64 %a, i64 %s) nounwind {
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entry:
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%t0 = icmp sgt i64 %n, 0 ; <i1> [#uses=1]
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br i1 %t0, label %bb.preheader, label %return
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bb.preheader: ; preds = %entry
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br label %bb
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bb: ; preds = %bb, %bb.preheader
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%i.01 = phi i64 [ %t6, %bb ], [ %a, %bb.preheader ] ; <i64> [#uses=3]
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%t1 = and i64 %i.01, 255 ; <i64> [#uses=1]
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%t2 = getelementptr i64* %A, i64 %t1 ; <i64*> [#uses=1]
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store i64 %i.01, i64* %t2, align 8
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%t6 = add i64 %i.01, %s ; <i64> [#uses=1]
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br label %bb
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return: ; preds = %entry
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ret void
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}
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