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4e8a98519e
casted induction variables in cases where the cast isn't foldable. It ended up being a pessimization in many cases. This could be fixed, but it would require a bunch of complicated code in IVUsers' clients. The advantages of this approach aren't visible enough to justify it at this time. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73706 91177308-0d34-0410-b5e6-96231b3b80d8
27 lines
766 B
LLVM
27 lines
766 B
LLVM
; RUN: llvm-as < %s | opt -indvars | llvm-dis > %t
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; RUN: not grep trunc %t
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; RUN: grep and %t | 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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