Much improved pic jumptable codegen:
authorEvan Cheng <evan.cheng@apple.com>
Fri, 9 Nov 2007 01:32:10 +0000 (01:32 +0000)
committerEvan Cheng <evan.cheng@apple.com>
Fri, 9 Nov 2007 01:32:10 +0000 (01:32 +0000)
commitcc41586b9d79532172b37e1f44a9077da4b73fc9
treeefeac53c6dd2e713a156d7a62ccc9fc748890d7e
parent2dfdefd282a04785c4d7b43e37782ace65af2ba6
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
12 files changed:
include/llvm/CodeGen/AsmPrinter.h
include/llvm/Target/TargetLowering.h
lib/CodeGen/AsmPrinter.cpp
lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
lib/CodeGen/SelectionDAG/TargetLowering.cpp
lib/Target/ARM/ARMAsmPrinter.cpp
lib/Target/X86/X86ATTAsmPrinter.cpp
lib/Target/X86/X86ATTAsmPrinter.h
lib/Target/X86/X86ISelLowering.cpp
lib/Target/X86/X86ISelLowering.h
lib/Target/X86/X86IntelAsmPrinter.cpp
lib/Target/X86/X86IntelAsmPrinter.h