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Reserve ECX and EDI instead of EBX and EDI. Since EBX is a callee

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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
This commit is contained in:
Alkis Evlogimenos 2003-12-28 18:03:52 +00:00
parent 26bfc08b80
commit 27490a6fcc
1 changed files with 8 additions and 8 deletions
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16
lib/CodeGen/RegAllocLinearScan.cpp
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@ -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 */