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Initial commit of the machine code LICM pass. It successfully hoists this:

Browse Source 
_foo:
        li r2, 0
LBB1_1: ; bb
        li r5, 0
        stw r5, 0(r3)
        addi r2, r2, 1
        addi r3, r3, 4
        cmplw cr0, r2, r4
        bne cr0, LBB1_1 ; bb
LBB1_2: ; return
        blr 

to:

_foo:
        li r2, 0
        li r5, 0
LBB1_1: ; bb
        stw r5, 0(r3)
        addi r2, r2, 1
        addi r3, r3, 4
        cmplw cr0, r2, r4
        bne cr0, LBB1_1 ; bb
LBB1_2: ; return
        blr

ZOMG!! :-)

Moar to come...


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44687 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling
2007-12-07 21:42:31 +00:00
parent 779ccea5b6
commit 0f940c95d4
4 changed files with 357 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files
lib/CodeGen/LLVMTargetMachine.cpp
+8 -4
View File
@@ -66,7 +66,9 @@ LLVMTargetMachine::addPassesToEmitFile(FunctionPassManager &PM,
// Print the instruction selected machine code...
if (PrintMachineCode)
PM.add(createMachineFunctionPrinterPass(cerr));
PM.add(createMachineLICMPass());
// Perform register allocation to convert to a concrete x86 representation
PM.add(createRegisterAllocator());
@@ -92,7 +94,7 @@ LLVMTargetMachine::addPassesToEmitFile(FunctionPassManager &PM,
// Branch folding must be run after regalloc and prolog/epilog insertion.
if (!Fast)
PM.add(createBranchFoldingPass(getEnableTailMergeDefault()));
// Fold redundant debug labels.
PM.add(createDebugLabelFoldingPass());
@@ -175,7 +177,9 @@ bool LLVMTargetMachine::addPassesToEmitMachineCode(FunctionPassManager &PM,
// Print the instruction selected machine code...
if (PrintMachineCode)
PM.add(createMachineFunctionPrinterPass(cerr));
PM.add(createMachineLICMPass());
// Perform register allocation to convert to a concrete x86 representation
PM.add(createRegisterAllocator());
@@ -204,7 +208,7 @@ bool LLVMTargetMachine::addPassesToEmitMachineCode(FunctionPassManager &PM,
// Branch folding must be run after regalloc and prolog/epilog insertion.
if (!Fast)
PM.add(createBranchFoldingPass(getEnableTailMergeDefault()));
if (addPreEmitPass(PM, Fast) && PrintMachineCode)
PM.add(createMachineFunctionPrinterPass(cerr));