From 9ae03fa69f6bc19acd8043414160320c1da0c3da Mon Sep 17 00:00:00 2001 From: Jakob Stoklund Olesen Date: Sat, 15 Sep 2012 16:29:49 +0000 Subject: [PATCH] Make LiveRangeQuery work for PHIDefs as well. If a PHI value happens to be live out from the layout predecessor of its def block, the def slot index will be in the middle of the segment: %vreg11 = [192r,240B:0)[352r,416B:2)[416B,496r:1) 0@192r 1@480B-phi %2@352r A LiveRangeQuery for 480 should return NULL from valueIn() since the PHI value is defined at the block entry, not live in to the block. No test case, future code depends on this functionality. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163971 91177308-0d34-0410-b5e6-96231b3b80d8 --- include/llvm/CodeGen/LiveInterval.h | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/include/llvm/CodeGen/LiveInterval.h b/include/llvm/CodeGen/LiveInterval.h index d7b8f44e07b..3bce496b2b5 100644 --- a/include/llvm/CodeGen/LiveInterval.h +++ b/include/llvm/CodeGen/LiveInterval.h @@ -508,6 +508,12 @@ namespace llvm { if (++I == E) return; } + // Special case: A PHIDef value can have its def in the middle of a + // segment if the value happens to be live out of the layout + // predecessor. + // Such a value is not live-in. + if (EarlyVal->def == Idx.getBaseIndex()) + EarlyVal = 0; } // I now points to the segment that may be live-through, or defined by // this instr. Ignore segments starting after the current instr. -- 2.34.1