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Enable optimization suggested by Chris Lattner to not emit reloc stubs for

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static global variables whose addresses are taken.  This allows us to
convert the following code for taking the address of a static function foo

        addis r2, r30, ha16(Ll1__2E_foo_2$non_lazy_ptr-"L00001$pb")
        lwz r3, lo16(Ll1__2E_foo_2$non_lazy_ptr-"L00001$pb")(r2)

which also includes linker stub code emitted at the end of the .s file not
shown here, and replace it with this:

        addis r2, r30, ha16(l1__2E_foo_2-"L00001$pb")
        la r3, lo16(l1__2E_foo_2-"L00001$pb")(r2)

which in addition to not needing linker help, also has no load instruction.
For those not up on PowerPC mnemonics, la is shorthand for add immediate.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18239 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nate Begeman
2004-11-25 07:09:01 +00:00
parent 4f7ac4c76c
commit d4c8bea47f
3 changed files with 18 additions and 21 deletions
Download Patch File Download Diff File Expand all files Collapse all files
lib/Target/PowerPC/PPCCodeEmitter.cpp
+3 -3
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@@ -199,20 +199,20 @@ int PPC32CodeEmitter::getMachineOpValue(MachineInstr &MI, MachineOperand &MO) {
Offset = -((intptr_t)MovePCtoLROffset+4);
if (MI.getOpcode() == PPC::LOADHiAddr) {
if (GV->hasWeakLinkage() || GV->isExternal() || isa<Function>(GV))
if (GV->hasWeakLinkage() || GV->isExternal())
Reloc = PPC::reloc_absolute_ptr_high; // Pointer to stub
else
Reloc = PPC::reloc_absolute_high; // Pointer to symbol
} else if (MI.getOpcode() == PPC::LA) {
assert(!(GV->hasWeakLinkage() || GV->isExternal() || isa<Function>(GV))
assert(!(GV->hasWeakLinkage() || GV->isExternal())
&& "Something in the ISEL changed\n");
Reloc = PPC::reloc_absolute_low;
} else if (MI.getOpcode() == PPC::LWZ) {
Reloc = PPC::reloc_absolute_ptr_low;
assert((GV->hasWeakLinkage() || GV->isExternal() || isa<Function>(GV))&&
assert((GV->hasWeakLinkage() || GV->isExternal()) &&
"Something in the ISEL changed\n");
} else {
// These don't show up for global value references AFAIK, only for