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https://github.com/c64scene-ar/llvm-6502.git
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448db1cdef
explicitly split into stride-and-offset pairs. Also, add the ability to track multiple post-increment loops on the same expression. This refines the concept of "normalizing" SCEV expressions used for to post-increment uses, and introduces a dedicated utility routine for normalizing and denormalizing expressions. This fixes the expansion of expressions which are post-increment users of more than one loop at a time. More broadly, this takes LSR another step closer to being able to reason about more than one loop at a time. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100699 91177308-0d34-0410-b5e6-96231b3b80d8
19 lines
452 B
LLVM
19 lines
452 B
LLVM
; RUN: opt < %s -analyze -iv-users | grep {\{1,+,3,+,2\}<%loop> (post-inc with loop %loop)}
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; The value of %r is dependent on a polynomial iteration expression.
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define i64 @foo(i64 %n) {
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entry:
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br label %loop
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loop:
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%indvar = phi i64 [ 0, %entry ], [ %indvar.next, %loop ]
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%indvar.next = add i64 %indvar, 1
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%c = icmp eq i64 %indvar.next, %n
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br i1 %c, label %exit, label %loop
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exit:
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%r = mul i64 %indvar.next, %indvar.next
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ret i64 %r
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}
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