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Enable code placement optimization pass for ARM. 

llvm-svn: 114746
This commit is contained in:
Evan Cheng 2010-09-24 19:07:23 +00:00
parent 6a4cd59b08
commit dbcc4b4d4d
3 changed files with 53 additions and 10 deletions
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8
llvm/lib/Target/ARM/ARMISelLowering.cpp
View File

@ -76,11 +76,6 @@ ARMInterworking("arm-interworking", cl::Hidden,
cl::desc("Enable / disable ARM interworking (for debugging only)"),
cl::init(true));
static cl::opt<bool>
EnableARMCodePlacement("arm-code-placement", cl::Hidden,
cl::desc("Enable code placement pass for ARM"),
cl::init(false));
void ARMTargetLowering::addTypeForNEON(EVT VT, EVT PromotedLdStVT,
EVT PromotedBitwiseVT) {
if (VT != PromotedLdStVT) {
@ -550,8 +545,7 @@ ARMTargetLowering::ARMTargetLowering(TargetMachine &TM)
// are at least 4 bytes aligned.
setMinStackArgumentAlignment(4);
if (EnableARMCodePlacement)
benefitFromCodePlacementOpt = true;
benefitFromCodePlacementOpt = true;
}
std::pair<const TargetRegisterClass*, uint8_t>

4
llvm/test/CodeGen/ARM/arm-and-tst-peephole.ll
View File

@ -18,13 +18,13 @@ tailrecurse: ; preds = %sw.bb, %entry
%0 = ptrtoint i8* %tmp2 to i32
; CHECK: ands r12, r12, #3
; CHECK-NEXT: beq LBB0_4
; CHECK-NEXT: beq LBB0_2
; T2: movs r5, #3
; T2-NEXT: mov r6, r4
; T2-NEXT: ands r6, r5
; T2-NEXT: tst r4, r5
; T2-NEXT: beq LBB0_5
; T2-NEXT: beq LBB0_3
%and = and i32 %0, 3
%tst = icmp eq i32 %and, 0

51
llvm/test/CodeGen/ARM/code-placement.ll
View File

@ -5,8 +5,9 @@
%struct.list_data_s = type { i16, i16 }
%struct.list_head = type { %struct.list_head*, %struct.list_data_s* }
define arm_apcscc %struct.list_head* @t(%struct.list_head* %list) nounwind {
define arm_apcscc %struct.list_head* @t1(%struct.list_head* %list) nounwind {
entry:
; CHECK: t1:
%0 = icmp eq %struct.list_head* %list, null
br i1 %0, label %bb2, label %bb
@ -27,3 +28,51 @@ bb2:
%next.0.lcssa = phi %struct.list_head* [ null, %entry ], [ %list_addr.05, %bb ]
ret %struct.list_head* %next.0.lcssa
}
; Optimize loop entry, eliminate intra loop branches
; rdar://8117827
define i32 @t2(i32 %passes, i32* nocapture %src, i32 %size) nounwind readonly {
entry:
; CHECK: t2:
; CHECK: beq LBB1_5
%0 = icmp eq i32 %passes, 0 ; <i1> [#uses=1]
br i1 %0, label %bb5, label %bb.nph15
; CHECK: LBB1_2
bb1: ; preds = %bb2.preheader, %bb1
; CHECK: LBB1_3:
; CHECK: bne LBB1_3
%indvar = phi i32 [ %indvar.next, %bb1 ], [ 0, %bb2.preheader ] ; <i32> [#uses=2]
%sum.08 = phi i32 [ %2, %bb1 ], [ %sum.110, %bb2.preheader ] ; <i32> [#uses=1]
%tmp17 = sub i32 %i.07, %indvar ; <i32> [#uses=1]
%scevgep = getelementptr i32* %src, i32 %tmp17 ; <i32*> [#uses=1]
%1 = load i32* %scevgep, align 4 ; <i32> [#uses=1]
%2 = add nsw i32 %1, %sum.08 ; <i32> [#uses=2]
%indvar.next = add i32 %indvar, 1 ; <i32> [#uses=2]
%exitcond = icmp eq i32 %indvar.next, %size ; <i1> [#uses=1]
br i1 %exitcond, label %bb3, label %bb1
bb3: ; preds = %bb1, %bb2.preheader
; CHECK: LBB1_4
; CHECK: bne LBB1_2
; CHECK-NOT: b LBB1_
; CHECK: ldmia sp!
%sum.0.lcssa = phi i32 [ %sum.110, %bb2.preheader ], [ %2, %bb1 ] ; <i32> [#uses=2]
%3 = add i32 %pass.011, 1 ; <i32> [#uses=2]
%exitcond18 = icmp eq i32 %3, %passes ; <i1> [#uses=1]
br i1 %exitcond18, label %bb5, label %bb2.preheader
bb.nph15: ; preds = %entry
%i.07 = add i32 %size, -1 ; <i32> [#uses=2]
%4 = icmp sgt i32 %i.07, -1 ; <i1> [#uses=1]
br label %bb2.preheader
bb2.preheader: ; preds = %bb3, %bb.nph15
%pass.011 = phi i32 [ 0, %bb.nph15 ], [ %3, %bb3 ] ; <i32> [#uses=1]
%sum.110 = phi i32 [ 0, %bb.nph15 ], [ %sum.0.lcssa, %bb3 ] ; <i32> [#uses=2]
br i1 %4, label %bb1, label %bb3
bb5: ; preds = %bb3, %entry
%sum.1.lcssa = phi i32 [ 0, %entry ], [ %sum.0.lcssa, %bb3 ] ; <i32> [#uses=1]
ret i32 %sum.1.lcssa
}