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Do folding for indirect branches, where possible

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102836 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Anton Korobeynikov 2010-05-01 12:28:21 +00:00
parent 69d5b48bc3
commit 1b17614a72
3 changed files with 33 additions and 7 deletions
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2
lib/Target/MSP430/MSP430BranchSelector.cpp
View File

@ -157,7 +157,7 @@ bool MSP430BSel::runOnMachineFunction(MachineFunction &Fn) {
NewSize = 6;
}
// Uncond branch to the real destination.
I = BuildMI(MBB, I, dl, TII->get(MSP430::B)).addMBB(Dest);
I = BuildMI(MBB, I, dl, TII->get(MSP430::Bi)).addMBB(Dest);
// Remove the old branch from the function.
OldBranch->eraseFromParent();

9
lib/Target/MSP430/MSP430InstrInfo.td
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@ -76,9 +76,6 @@ def memdst : Operand<i16> {
let MIOperandInfo = (ops GR16, i16imm);
}
// Branch targets have OtherVT type.
def brtarget : Operand<OtherVT>;
// Short jump targets have OtherVT type and are printed as pcrel imm values.
def jmptarget : Operand<OtherVT> {
let PrintMethod = "printPCRelImmOperand";
@ -177,9 +174,9 @@ let isBarrier = 1 in {
[(br bb:$dst)]>;
let isIndirectBranch = 1 in {
// Long branches
def B : I16ri<0, (outs), (ins brtarget:$dst),
"br\t$dst",
[]>;
def Bi : I16ri<0, (outs), (ins i16imm:$brdst),
"br\t$brdst",
[(brind tblockaddress:$brdst)]>;
def Br : I16rr<0, (outs), (ins GR16:$brdst),
"mov.w\t{$brdst, pc}",
[(brind GR16:$brdst)]>;

29
test/CodeGen/MSP430/indirectbr2.ll Normal file
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@ -0,0 +1,29 @@
; RUN: llc -march=msp430 < %s | FileCheck %s
@C.0.2070 = private constant [5 x i8*] [i8* blockaddress(@foo, %L1), i8* blockaddress(@foo, %L2), i8* blockaddress(@foo, %L3), i8* blockaddress(@foo, %L4), i8* blockaddress(@foo, %L5)] ; <[5 x i8*]*> [#uses=1]
define internal i16 @foo(i16 %i) nounwind {
entry:
%tmp1 = getelementptr inbounds [5 x i8*]* @C.0.2070, i16 0, i16 %i ; <i8**> [#uses=1]
%gotovar.4.0 = load i8** %tmp1, align 4 ; <i8*> [#uses=1]
; CHECK: mov.w .LC.0.2070(r15), pc
indirectbr i8* %gotovar.4.0, [label %L5, label %L4, label %L3, label %L2, label %L1]
L5: ; preds = %bb2
br label %L4
L4: ; preds = %L5, %bb2
%res.0 = phi i16 [ 385, %L5 ], [ 35, %entry ] ; <i16> [#uses=1]
br label %L3
L3: ; preds = %L4, %bb2
%res.1 = phi i16 [ %res.0, %L4 ], [ 5, %entry ] ; <i16> [#uses=1]
br label %L2
L2: ; preds = %L3, %bb2
%res.2 = phi i16 [ %res.1, %L3 ], [ 1, %entry ] ; <i16> [#uses=1]
br label %L1
L1: ; preds = %L2, %bb2
%res.3 = phi i16 [ %res.2, %L2 ], [ 2, %entry ] ; <i16> [#uses=1]
ret i16 %res.3
}