From fe014df914aa2e07a15d1c9eaa864570ec5c9949 Mon Sep 17 00:00:00 2001 From: Evan Cheng Date: Sun, 8 Feb 2009 08:00:36 +0000 Subject: [PATCH] r64073 commit message is lost. Here it is: Right now if the coalesced copy def is dead and its src is a kill, and that there are now other uses within the live range, the coalescer would mark the def of the source register as dead. But it should also check if there are other kills which means the value has other uses not in the live range. llvm-svn: 64075 --- llvm/lib/CodeGen/SimpleRegisterCoalescing.cpp | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/llvm/lib/CodeGen/SimpleRegisterCoalescing.cpp b/llvm/lib/CodeGen/SimpleRegisterCoalescing.cpp index 75389a412a0f..a7d5d0075d24 100644 --- a/llvm/lib/CodeGen/SimpleRegisterCoalescing.cpp +++ b/llvm/lib/CodeGen/SimpleRegisterCoalescing.cpp @@ -867,11 +867,12 @@ SimpleRegisterCoalescing::ShortenDeadCopySrcLiveRange(LiveInterval &li, if (LR->valno->def == RemoveStart) { // If the def MI defines the val# and this copy is the only kill of the // val#, then propagate the dead marker. - if (li.isOnlyKill(LR->valno, RemoveEnd)) { + if (!li.isOnlyKill(LR->valno, RemoveEnd)) + li.removeKill(LR->valno, RemoveEnd); + else { PropagateDeadness(li, CopyMI, RemoveStart, li_, tri_); ++numDeadValNo; - } else - li.removeKill(LR->valno, RemoveEnd); + } } removeRange(li, RemoveStart, LR->end, li_, tri_);