From 27490a6fcc8e24be0ee4ddfcdbdf7e9da9e5af41 Mon Sep 17 00:00:00 2001 From: Alkis Evlogimenos Date: Sun, 28 Dec 2003 18:03:52 +0000 Subject: [PATCH] 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 --- lib/CodeGen/RegAllocLinearScan.cpp | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) diff --git a/lib/CodeGen/RegAllocLinearScan.cpp b/lib/CodeGen/RegAllocLinearScan.cpp index e2c1a18b440..e677ce8824b 100644 --- a/lib/CodeGen/RegAllocLinearScan.cpp +++ b/lib/CodeGen/RegAllocLinearScan.cpp @@ -238,17 +238,17 @@ bool RA::runOnMachineFunction(MachineFunction &fn) { // 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 */