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Much improved pic jumptable codegen:

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Then:
        call    "L1$pb"
"L1$pb":
        popl    %eax
		...
LBB1_1: # entry
        imull   $4, %ecx, %ecx
        leal    LJTI1_0-"L1$pb"(%eax), %edx
        addl    LJTI1_0-"L1$pb"(%ecx,%eax), %edx
        jmpl    *%edx

        .align  2
        .set L1_0_set_3,LBB1_3-LJTI1_0
        .set L1_0_set_2,LBB1_2-LJTI1_0
        .set L1_0_set_5,LBB1_5-LJTI1_0
        .set L1_0_set_4,LBB1_4-LJTI1_0
LJTI1_0:
        .long    L1_0_set_3
        .long    L1_0_set_2

Now:
        call    "L1$pb"
"L1$pb":
        popl    %eax
		...
LBB1_1: # entry
        addl    LJTI1_0-"L1$pb"(%eax,%ecx,4), %eax
        jmpl    *%eax

		.align  2
		.set L1_0_set_3,LBB1_3-"L1$pb"
		.set L1_0_set_2,LBB1_2-"L1$pb"
		.set L1_0_set_5,LBB1_5-"L1$pb"
		.set L1_0_set_4,LBB1_4-"L1$pb"
LJTI1_0:
        .long    L1_0_set_3
        .long    L1_0_set_2


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43924 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2007-11-09 01:32:10 +00:00
parent 2dfdefd282
commit cc41586b9d
12 changed files with 87 additions and 27 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
include/llvm/CodeGen/AsmPrinter.h
View File

@@ -305,11 +305,12 @@ namespace llvm {
bool printColon = false,
bool printComment = true) const;
/// printSetLabel - This method prints a set label for the specified
/// MachineBasicBlock
void printSetLabel(unsigned uid, const MachineBasicBlock *MBB) const;
void printSetLabel(unsigned uid, unsigned uid2,
const MachineBasicBlock *MBB) const;
/// printPICJumpTableSetLabel - This method prints a set label for the
/// specified MachineBasicBlock for a jumptable entry.
virtual void printPICJumpTableSetLabel(unsigned uid,
const MachineBasicBlock *MBB) const;
virtual void printPICJumpTableSetLabel(unsigned uid, unsigned uid2,
const MachineBasicBlock *MBB) const;
/// printDataDirective - This method prints the asm directive for the
/// specified type.

7
include/llvm/Target/TargetLowering.h
View File

@@ -93,7 +93,7 @@ public:
/// usesGlobalOffsetTable - Return true if this target uses a GOT for PIC
/// codegen.
bool usesGlobalOffsetTable() const { return UsesGlobalOffsetTable; }
/// isSelectExpensive - Return true if the select operation is expensive for
/// this target.
bool isSelectExpensive() const { return SelectIsExpensive; }
@@ -543,6 +543,11 @@ public:
return false;
}
/// getPICJumpTableRelocaBase - Returns relocation base for the given PIC
/// jumptable.
virtual SDOperand getPICJumpTableRelocBase(SDOperand Table,
SelectionDAG &DAG) const;
//===--------------------------------------------------------------------===//
// TargetLowering Optimization Methods
//