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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@38513 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2007-07-10 21:49:47 +00:00
parent bf6b8272b1
commit c608ff22e7
2 changed files with 18 additions and 15 deletions
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14
lib/Target/ARM/ARMConstantIslandPass.cpp
View File

@ -199,8 +199,8 @@ void ARMConstantIslands::verify(MachineFunction &Fn) {
/// print block size and offset information - debugging
void ARMConstantIslands::dumpBBs() {
for (unsigned J = 0, E = BBOffsets.size(); J !=E; ++J) {
DOUT << "block" << J << " offset" << BBOffsets[J] <<
" size" << BBSizes[J] << "\n";
DOUT << "block " << J << " offset " << BBOffsets[J] <<
" size " << BBSizes[J] << "\n";
}
}
@ -255,10 +255,10 @@ bool ARMConstantIslands::runOnMachineFunction(MachineFunction &Fn) {
bool Change = false;
for (unsigned i = 0, e = CPUsers.size(); i != e; ++i)
Change |= HandleConstantPoolUser(Fn, i);
DEBUG(dumpBBs());
//DEBUG(dumpBBs());
for (unsigned i = 0, e = ImmBranches.size(); i != e; ++i)
Change |= FixUpImmediateBr(Fn, ImmBranches[i]);
DEBUG(dumpBBs());
//DEBUG(dumpBBs());
if (!Change)
break;
MadeChange = true;
@ -798,8 +798,8 @@ int ARMConstantIslands::LookForExistingCPEntry(CPUser& U, unsigned UserOffset)
MachineInstr *CPEMI = U.CPEMI;
// Check to see if the CPE is already in-range.
if (CPEIsInRange(UserMI, UserOffset, CPEMI, U.MaxDisp, true)) {
DOUT << "In range\n";
if (CPEIsInRange(UserMI, UserOffset, CPEMI, U.MaxDisp, false /*true*/)) {
//DOUT << "In range\n";
return 1;
}
@ -1120,11 +1120,13 @@ bool ARMConstantIslands::BBIsInRange(MachineInstr *MI,MachineBasicBlock *DestBB,
unsigned BrOffset = GetOffsetOf(MI) + PCAdj;
unsigned DestOffset = BBOffsets[DestBB->getNumber()];
#if 0
DOUT << "Branch of destination BB#" << DestBB->getNumber()
<< " from BB#" << MI->getParent()->getNumber()
<< " max delta=" << MaxDisp
<< " from " << GetOffsetOf(MI) << " to " << DestOffset
<< " offset " << int(DestOffset-BrOffset) << "\t" << *MI;
#endif
if (BrOffset <= DestOffset) {
// Branch before the Dest.

19
lib/Target/ARM/README.txt
View File

@ -7,7 +7,6 @@ Reimplement 'select' in terms of 'SEL'.
* We would really like to support UXTAB16, but we need to prove that the
add doesn't need to overflow between the two 16-bit chunks.
* implement predication support
* Implement pre/post increment support. (e.g. PR935)
* Coalesce stack slots!
* Implement smarter constant generation for binops with large immediates.
@ -44,16 +43,12 @@ consecutive islands as a single block rather than multiple blocks.
//===---------------------------------------------------------------------===//
We need to start generating predicated instructions. The .td files have a way
to express this now (see the PPC conditional return instruction), but the
branch folding pass (or a new if-cvt pass) should start producing these, at
least in the trivial case.
Eliminate copysign custom expansion. We are still generating crappy code with
default expansion + if-conversion.
Among the obvious wins, doing so can eliminate the need to custom expand
copysign (i.e. we won't need to custom expand it to get the conditional
negate).
//===---------------------------------------------------------------------===//
This allows us to eliminate one instruction from:
Eliminate one instruction from:
define i32 @_Z6slow4bii(i32 %x, i32 %y) {
%tmp = icmp sgt i32 %x, %y
@ -66,6 +61,12 @@ __Z6slow4bii:
movgt r1, r0
mov r0, r1
bx lr
=>
__Z6slow4bii:
cmp r0, r1
movle r0, r1
bx lr
//===---------------------------------------------------------------------===//