Much improved pic jumptable codegen:

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

1 files changed, 6 insertions, 1 deletions

diff --git a/include/llvm/Target/TargetLowering.h b/include/llvm/Target/TargetLowering.h
index 79af960..ee26579 100644
--- a/include/llvm/Target/TargetLowering.h
+++ b/include/llvm/Target/TargetLowering.h
@@ -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
   //