Reserve ECX and EDI instead of EBX and EDI. Since EBX is a callee
saved register it has a longer free range than ECX (which is defined
every time there is a fnuction call) which makes ECX a better register
to reserve.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@10635 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/RegAllocLinearScan.cpp b/lib/CodeGen/RegAllocLinearScan.cpp
index e2c1a18..e677ce8 100644
--- a/lib/CodeGen/RegAllocLinearScan.cpp
+++ b/lib/CodeGen/RegAllocLinearScan.cpp
@@ -238,17 +238,17 @@
// aliasing) number of temp registers to reserve so that we have 2
// registers for each register class available.
- // reserve R32: EDI, EBX,
- // R16: DI, BX,
- // R8: BH, BL
+ // reserve R8: CH, CL
+ // R16: CX, DI,
+ // R32: ECX, EDI,
// RFP: FP5, FP6
reserved_.assign(MRegisterInfo::FirstVirtualRegister, false);
- reserved_[19] = true; /* EDI */
- reserved_[17] = true; /* EBX */
+ reserved_[ 8] = true; /* CH */
+ reserved_[ 9] = true; /* CL */
+ reserved_[10] = true; /* CX */
reserved_[12] = true; /* DI */
- reserved_[ 7] = true; /* BX */
- reserved_[ 4] = true; /* BH */
- reserved_[ 5] = true; /* BL */
+ reserved_[18] = true; /* ECX */
+ reserved_[19] = true; /* EDI */
reserved_[28] = true; /* FP5 */
reserved_[29] = true; /* FP6 */