[llvm-commits] [llvm] r53734 - in /llvm/trunk: lib/CodeGen/SimpleRegisterCoalescing.cpp test/CodeGen/X86/2008-07-16-CoalescerCrash.ll

[Evan Cheng]

Author: evancheng
Date: Thu Jul 17 14:48:53 2008
New Revision: 53734

URL: http://llvm.org/viewvc/llvm-project?rev=53734&view=rev
Log:
Subreg live interval valno may not have a corresponding def machineinstr since it's less precise.

Added:
    llvm/trunk/test/CodeGen/X86/2008-07-16-CoalescerCrash.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=53734&r1=53733&r2=53734&view=diff

==============================================================================
--- llvm/trunk/lib/CodeGen/SimpleRegisterCoalescing.cpp (original)
+++ llvm/trunk/lib/CodeGen/SimpleRegisterCoalescing.cpp Thu Jul 17 14:48:53 2008
@@ -1327,7 +1327,7 @@
     // Re-compute it.
     MachineInstr *DefMI = li_->getInstructionFromIndex(LR->start);
     unsigned SrcReg, DstReg;
-    if (tii_->isMoveInstr(*DefMI, SrcReg, DstReg) &&
+    if (DefMI && tii_->isMoveInstr(*DefMI, SrcReg, DstReg) &&
         DstReg == li.reg && SrcReg == Reg) {
       // Cache computed info.
       LR->valno->def  = LR->start;

Added: llvm/trunk/test/CodeGen/X86/2008-07-16-CoalescerCrash.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/X86/2008-07-16-CoalescerCrash.ll?rev=53734&view=auto

==============================================================================
--- llvm/trunk/test/CodeGen/X86/2008-07-16-CoalescerCrash.ll (added)
+++ llvm/trunk/test/CodeGen/X86/2008-07-16-CoalescerCrash.ll Thu Jul 17 14:48:53 2008
@@ -0,0 +1,34 @@
+; RUN: llvm-as < %s | llc -mtriple=x86_64-apple-darwin
+
+	%struct.SV = type { i8*, i64, i64 }
+@"\01LC25" = external constant [8 x i8]		; <[8 x i8]*> [#uses=1]
+
+declare void @Perl_sv_catpvf(%struct.SV*, i8*, ...) nounwind 
+
+declare fastcc i64 @Perl_utf8n_to_uvuni(i8*, i64, i64*, i64) nounwind 
+
+define fastcc i8* @Perl_pv_uni_display(%struct.SV* %dsv, i8* %spv, i64 %len, i64 %pvlim, i64 %flags) nounwind  {
+entry:
+	br i1 false, label %bb, label %bb40
+
+bb:		; preds = %entry
+	tail call fastcc i64 @Perl_utf8n_to_uvuni( i8* null, i64 13, i64* null, i64 255 ) nounwind 		; <i64>:0 [#uses=1]
+	br i1 false, label %bb6, label %bb33
+
+bb6:		; preds = %bb
+	br i1 false, label %bb30, label %bb31
+
+bb30:		; preds = %bb6
+	unreachable
+
+bb31:		; preds = %bb6
+	icmp eq i8 0, 0		; <i1>:1 [#uses=0]
+	br label %bb33
+
+bb33:		; preds = %bb31, %bb
+	tail call void (%struct.SV*, i8*, ...)* @Perl_sv_catpvf( %struct.SV* %dsv, i8* getelementptr ([8 x i8]* @"\01LC25", i32 0, i64 0), i64 %0 ) nounwind 
+	unreachable
+
+bb40:		; preds = %entry
+	ret i8* null
+}