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Make register FP allocatable if the compiled function does not have dynamic

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allocas.

llvm-svn: 156458
This commit is contained in:
Akira Hatanaka 2012-05-09 01:38:13 +00:00
parent bd2f3d1c46
commit a53bdc878f
2 changed files with 47 additions and 2 deletions
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10
lib/Target/Mips/MipsRegisterInfo.cpp
View File

@ -85,12 +85,12 @@ BitVector MipsRegisterInfo::
getReservedRegs(const MachineFunction &MF) const {
static const uint16_t ReservedCPURegs[] = {
Mips::ZERO, Mips::AT, Mips::K0, Mips::K1,
Mips::SP, Mips::FP, Mips::RA
Mips::SP, Mips::RA
};
static const uint16_t ReservedCPU64Regs[] = {
Mips::ZERO_64, Mips::AT_64, Mips::K0_64, Mips::K1_64,
Mips::SP_64, Mips::FP_64, Mips::RA_64
Mips::SP_64, Mips::RA_64
};
BitVector Reserved(getNumRegs());
@ -124,6 +124,12 @@ getReservedRegs(const MachineFunction &MF) const {
Reserved.set(Mips::GP_64);
}
// If this function has dynamic allocas, reserve FP.
if (MF.getTarget().getFrameLowering()->hasFP(MF)) {
Reserved.set(Mips::FP);
Reserved.set(Mips::FP_64);
}
// Reserve hardware registers.
Reserved.set(Mips::HWR29);
Reserved.set(Mips::HWR29_64);

39
test/CodeGen/Mips/fp-spill-reload.ll Normal file
View File

@ -0,0 +1,39 @@
; RUN: llc -march=mipsel < %s | FileCheck %s
; check that $fp is not reserved.
define void @foo0(i32* nocapture %b) nounwind {
entry:
; CHECK: sw $fp
; CHECK: lw $fp
%0 = load i32* %b, align 4
%arrayidx.1 = getelementptr inbounds i32* %b, i32 1
%1 = load i32* %arrayidx.1, align 4
%add.1 = add nsw i32 %1, 1
%arrayidx.2 = getelementptr inbounds i32* %b, i32 2
%2 = load i32* %arrayidx.2, align 4
%add.2 = add nsw i32 %2, 2
%arrayidx.3 = getelementptr inbounds i32* %b, i32 3
%3 = load i32* %arrayidx.3, align 4
%add.3 = add nsw i32 %3, 3
%arrayidx.4 = getelementptr inbounds i32* %b, i32 4
%4 = load i32* %arrayidx.4, align 4
%add.4 = add nsw i32 %4, 4
%arrayidx.5 = getelementptr inbounds i32* %b, i32 5
%5 = load i32* %arrayidx.5, align 4
%add.5 = add nsw i32 %5, 5
%arrayidx.6 = getelementptr inbounds i32* %b, i32 6
%6 = load i32* %arrayidx.6, align 4
%add.6 = add nsw i32 %6, 6
%arrayidx.7 = getelementptr inbounds i32* %b, i32 7
%7 = load i32* %arrayidx.7, align 4
%add.7 = add nsw i32 %7, 7
call void @foo2(i32 %0, i32 %add.1, i32 %add.2, i32 %add.3, i32 %add.4, i32 %add.5, i32 %add.6, i32 %add.7) nounwind
call void bitcast (void (...)* @foo1 to void ()*)() nounwind
call void @foo2(i32 %0, i32 %add.1, i32 %add.2, i32 %add.3, i32 %add.4, i32 %add.5, i32 %add.6, i32 %add.7) nounwind
ret void
}
declare void @foo2(i32, i32, i32, i32, i32, i32, i32, i32)
declare void @foo1(...)