[llvm-commits] [llvm] r56287 - in /llvm/trunk: lib/CodeGen/SimpleRegisterCoalescing.cpp test/CodeGen/ARM/2008-09-17-CoalescerBug.ll

[Evan Cheng]

Author: evancheng
Date: Wed Sep 17 13:36:25 2008
New Revision: 56287

URL: http://llvm.org/viewvc/llvm-project?rev=56287&view=rev
Log:
Unallocatable registers do not have live intervals.

Added:
    llvm/trunk/test/CodeGen/ARM/2008-09-17-CoalescerBug.ll
Modified:
    llvm/trunk/lib/CodeGen/SimpleRegisterCoalescing.cpp

Modified: llvm/trunk/lib/CodeGen/SimpleRegisterCoalescing.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/SimpleRegisterCoalescing.cpp?rev=56287&r1=56286&r2=56287&view=diff

==============================================================================
--- llvm/trunk/lib/CodeGen/SimpleRegisterCoalescing.cpp (original)
+++ llvm/trunk/lib/CodeGen/SimpleRegisterCoalescing.cpp Wed Sep 17 13:36:25 2008
@@ -568,7 +568,9 @@
     unsigned CopySrcReg, CopyDstReg;
     if (TID.getNumDefs() == 1 && TID.getNumOperands() > 2 &&
         tii_->isMoveInstr(*UseMI, CopySrcReg, CopyDstReg) &&
-        CopySrcReg != CopyDstReg) {
+        CopySrcReg != CopyDstReg &&
+        (TargetRegisterInfo::isVirtualRegister(CopyDstReg) ||
+         allocatableRegs_[CopyDstReg])) {
       LiveInterval &LI = li_->getInterval(CopyDstReg);
       unsigned DefIdx = li_->getDefIndex(li_->getInstructionIndex(UseMI));
       const LiveRange *DLR = LI.getLiveRangeContaining(DefIdx);

Added: llvm/trunk/test/CodeGen/ARM/2008-09-17-CoalescerBug.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/ARM/2008-09-17-CoalescerBug.ll?rev=56287&view=auto

==============================================================================
--- llvm/trunk/test/CodeGen/ARM/2008-09-17-CoalescerBug.ll (added)
+++ llvm/trunk/test/CodeGen/ARM/2008-09-17-CoalescerBug.ll Wed Sep 17 13:36:25 2008
@@ -0,0 +1,17 @@
+; RUN: llvm-as < %s | llc -mtriple=arm-apple-darwin
+
+define void @gcov_exit() nounwind {
+entry:
+	br i1 false, label %bb24, label %bb33.thread
+
+bb24:		; preds = %entry
+	br label %bb39
+
+bb33.thread:		; preds = %entry
+	%0 = alloca i8, i32 0		; <i8*> [#uses=1]
+	br label %bb39
+
+bb39:		; preds = %bb33.thread, %bb24
+	%.reg2mem.0 = phi i8* [ %0, %bb33.thread ], [ null, %bb24 ]		; <i8*> [#uses=0]
+	ret void
+}