fd46308de4
Before adding a MK_Value READ MemoryAccess, check whether the read is necessary or synthesizable. Synthesizable values are later generated by the SCEVExpander and therefore do not need to be transferred explicitly. This can happen because the check for synthesizability has presumbly been forgotten in the case where a phi's incoming value has been defined in a different statement. Differential Revision: http://reviews.llvm.org/D15687 llvm-svn: 258998
40 lines
1.0 KiB
LLVM
40 lines
1.0 KiB
LLVM
; RUN: opt %loadPolly -polly-codegen -S < %s | FileCheck %s
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;
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; Check for the correct written value of a scalar phi write whose value is
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; defined within the loop, but its effective value is its last definition when
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; leaving the loop (in this test it is the value 2 for %i.inc). This can be
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; either computed:
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; - Using SCEVExpander:
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; In this case the Loop passed to the expander must NOT be the loop
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; - Overwriting the same alloca in each iteration s.t. the last value will
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; retain in %i.inc.s2a
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; The first is currently generated by Polly and tested here.
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; CHECK: polly.stmt.next:
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; CHECK-NEXT: store i32 2, i32* %phi.phiops
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; CHECK-NEXT: br label %polly.stmt.join
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define i32 @func() {
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entry:
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br label %start
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start:
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br i1 true, label %loop, label %join
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loop:
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%i = phi i32 [ 0, %start ], [ %i.inc, %loop ]
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%i.inc = add nsw i32 %i, 1
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%cond = icmp slt i32 %i.inc, 2
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br i1 %cond, label %loop, label %next
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next:
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br label %join
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join:
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%phi = phi i32 [%i.inc, %next], [0, %start]
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br label %return
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return:
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ret i32 %phi
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}
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