[llvm-commits] [llvm] r129408 - in /llvm/trunk: lib/CodeGen/RegAllocFast.cpp test/CodeGen/ARM/2011-04-12-FastRegAlloc.ll

[Eric Christopher]

Author: echristo
Date: Tue Apr 12 18:23:14 2011
New Revision: 129408

URL: http://llvm.org/viewvc/llvm-project?rev=129408&view=rev
Log:
Fix a bug where we were counting the alias sets as completely used
registers for fast allocation.

Fixes rdar://9207598

Added:
    llvm/trunk/test/CodeGen/ARM/2011-04-12-FastRegAlloc.ll
Modified:
    llvm/trunk/lib/CodeGen/RegAllocFast.cpp

Modified: llvm/trunk/lib/CodeGen/RegAllocFast.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/RegAllocFast.cpp?rev=129408&r1=129407&r2=129408&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/RegAllocFast.cpp (original)
+++ llvm/trunk/lib/CodeGen/RegAllocFast.cpp Tue Apr 12 18:23:14 2011
@@ -442,8 +442,6 @@
   unsigned Cost = 0;
   for (const unsigned *AS = TRI->getAliasSet(PhysReg);
        unsigned Alias = *AS; ++AS) {
-    if (UsedInInstr.test(Alias))
-      return spillImpossible;
     switch (unsigned VirtReg = PhysRegState[Alias]) {
     case regDisabled:
       break;

Added: llvm/trunk/test/CodeGen/ARM/2011-04-12-FastRegAlloc.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/ARM/2011-04-12-FastRegAlloc.ll?rev=129408&view=auto
==============================================================================
--- llvm/trunk/test/CodeGen/ARM/2011-04-12-FastRegAlloc.ll (added)
+++ llvm/trunk/test/CodeGen/ARM/2011-04-12-FastRegAlloc.ll Tue Apr 12 18:23:14 2011
@@ -0,0 +1,15 @@
+; RUN: llc < %s -O0 -verify-machineinstrs -regalloc=fast
+; Previously we'd crash as out of registers on this input by clobbering all of
+; the aliases.
+target datalayout = "e-p:32:32:32-i1:8:32-i8:8:32-i16:16:32-i32:32:32-i64:32:32-f32:32:32-f64:32:32-v64:32:64-v128:32:128-a0:0:32-n32"
+target triple = "thumbv7-apple-darwin10.0.0"
+
+define void @_Z8TestCasev() nounwind ssp {
+entry:
+  %a = alloca float, align 4
+  %tmp = load float* %a, align 4
+  call void asm sideeffect "", "w,~{s0},~{s16}"(float %tmp) nounwind, !srcloc !0
+  ret void
+}
+
+!0 = metadata !{i32 109}