d2210af332
Current findBestLoopTop can find and move one kind of block to top, a latch block has one successor. Another common case is:
* a latch block
* it has two successors, one is loop header, another is exit
* it has more than one predecessors
If it is below one of its predecessors P, only P can fall through to it, all other predecessors need a jump to it, and another conditional jump to loop header. If it is moved before loop header, all its predecessors jump to it, then fall through to loop header. So all its predecessors except P can reduce one taken branch.
Differential Revision: https://reviews.llvm.org/D43256
llvm-svn: 363471
138 lines
5.5 KiB
LLVM
138 lines
5.5 KiB
LLVM
; RUN: llc -verify-machineinstrs -mtriple=powerpc64le-unknown-linux-gnu \
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; RUN: -ppc-asm-full-reg-names -ppc-vsr-nums-as-vr < %s | FileCheck %s
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; RUN: llc -verify-machineinstrs -mtriple=powerpc64-unknown-linux-gnu -mcpu=pwr8 \
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; RUN: -ppc-asm-full-reg-names -ppc-vsr-nums-as-vr < %s | FileCheck %s
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; For known CRBit spills, CRSET/CRUNSET, it is more efficient to just load and
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; spill the known value. These tests verify that for CRSET and CRUNSET spills
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; we do not extract the bit for spilling.
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%struct.anon = type { i32 }
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@b = common dso_local global %struct.anon* null, align 8
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@a = common dso_local global i64 0, align 8
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; Function Attrs: nounwind
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define dso_local signext i32 @spillCRSET(i32 signext %p1, i32 signext %p2) {
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; CHECK-LABEL: spillCRSET:
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; CHECK: # %bb.2:
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; CHECK-DAG: crnor [[CREG:.*]]*cr5+lt, eq, eq
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; CHECK-DAG: mfocrf [[REG2:.*]], [[CREG]]
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; CHECK-DAG: rlwinm [[REG2]], [[REG2]]
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; CHECK: .LBB0_3:
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; CHECK-DAG: creqv [[CREG:.*]]*cr5+lt, [[CREG]]*cr5+lt, [[CREG]]*cr5+lt
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; CHECK: lis [[REG1:.*]], -32768
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; CHECK: .LBB0_4:
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; CHECK-NOT: mfocrf [[REG2:.*]], [[CREG]]
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; CHECK-NOT: rlwinm [[REG2]], [[REG2]]
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; CHECK: stw [[REG1]]
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; CHECK: # %bb.5:
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entry:
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%tobool = icmp eq i32 %p2, 0
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%tobool2 = icmp eq i32 %p1, 0
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br label %redo_first_pass
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redo_first_pass: ; preds = %for.end, %entry
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br i1 %tobool, label %if.end, label %if.then
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if.then: ; preds = %redo_first_pass
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%call = tail call signext i32 bitcast (i32 (...)* @fn2 to i32 ()*)() #2
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%tobool1 = icmp ne i32 %call, 0
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br label %if.end
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if.end: ; preds = %redo_first_pass, %if.then
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%c.1.off0 = phi i1 [ %tobool1, %if.then ], [ true, %redo_first_pass ]
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br i1 %tobool2, label %if.end4, label %if.then3
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if.then3: ; preds = %if.end
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%0 = load %struct.anon*, %struct.anon** @b, align 8
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%contains_i = getelementptr inbounds %struct.anon, %struct.anon* %0, i64 0, i32 0
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store i32 1, i32* %contains_i, align 4
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br label %if.end4
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if.end4: ; preds = %if.end, %if.then3
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tail call void asm sideeffect "#DO_NOTHING", "~{cr0},~{cr1},~{cr2},~{cr3},~{cr4},~{cr5},~{cr6},~{cr7}"()
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br i1 %c.1.off0, label %if.then6, label %if.end13
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if.then6: ; preds = %if.end4
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%1 = load i64, i64* @a, align 8
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%cmp21 = icmp eq i64 %1, 0
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br i1 %cmp21, label %if.end13, label %for.body
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for.body: ; preds = %if.then6, %for.body
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%s.122 = phi i64 [ %inc, %for.body ], [ 0, %if.then6 ]
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%call7 = tail call signext i32 bitcast (i32 (...)* @fn3 to i32 ()*)()
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%inc = add nuw i64 %s.122, 1
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%exitcond = icmp eq i64 %inc, %1
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br i1 %exitcond, label %for.end, label %for.body
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for.end: ; preds = %for.body
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br i1 %cmp21, label %if.end13, label %redo_first_pass
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if.end13: ; preds = %if.then6, %for.end, %if.end4
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ret i32 0
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}
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%struct.p5rx = type { i32 }
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; Function Attrs: nounwind
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define dso_local signext i32 @spillCRUNSET(%struct.p5rx* readonly %p1, i32 signext %p2, i32 signext %p3) {
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; CHECK-LABEL: spillCRUNSET:
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; CHECK: # %bb.0: # %entry
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; CHECK-DAG: crxor [[CREG:.*]]*cr5+lt, [[CREG]]*cr5+lt, [[CREG]]*cr5+lt
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; CHECK-DAG: li [[REG1:.*]], 0
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; CHECK-NOT: mfocrf [[REG2:.*]], [[CREG]]
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; CHECK-NOT: rlwinm [[REG2]], [[REG2]]
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; CHECK: stw [[REG1]]
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; CHECK: .LBB1_1:
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entry:
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%and = and i32 %p3, 128
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%tobool = icmp eq i32 %and, 0
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%tobool2 = icmp eq %struct.p5rx* %p1, null
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%sv_any = getelementptr inbounds %struct.p5rx, %struct.p5rx* %p1, i64 0, i32 0
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%tobool12 = icmp eq i32 %p2, 0
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br label %redo_first_pass
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redo_first_pass: ; preds = %if.end11, %entry
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%a.0.off0 = phi i1 [ false, %entry ], [ %a.1.off0, %if.end11 ]
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br i1 %tobool, label %if.end, label %if.then
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if.then: ; preds = %redo_first_pass
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%call = tail call signext i32 bitcast (i32 (...)* @fn2 to i32 ()*)()
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%tobool1 = icmp ne i32 %call, 0
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br label %if.end
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if.end: ; preds = %redo_first_pass, %if.then
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%a.1.off0 = phi i1 [ %tobool1, %if.then ], [ %a.0.off0, %redo_first_pass ]
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tail call void asm sideeffect "#DO_NOTHING", "~{cr0},~{cr1},~{cr2},~{cr3},~{cr4},~{cr5},~{cr6},~{cr7}"()
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br i1 %tobool2, label %if.end11, label %land.lhs.true
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land.lhs.true: ; preds = %if.end
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%call3 = tail call signext i32 bitcast (i32 (...)* @fn3 to i32 ()*)()
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%tobool4 = icmp eq i32 %call3, 0
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br i1 %tobool4, label %if.end11, label %land.lhs.true5
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land.lhs.true5: ; preds = %land.lhs.true
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%0 = load i32, i32* %sv_any, align 4
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%tobool6 = icmp eq i32 %0, 0
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%a.1.off0.not = xor i1 %a.1.off0, true
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%brmerge = or i1 %tobool6, %a.1.off0.not
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br i1 %brmerge, label %if.end11, label %if.then9
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if.then9: ; preds = %land.lhs.true5
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%call10 = tail call signext i32 bitcast (i32 (...)* @fn4 to i32 ()*)()
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br label %if.end11
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if.end11: ; preds = %land.lhs.true5, %land.lhs.true, %if.end, %if.then9
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br i1 %tobool12, label %if.end14, label %redo_first_pass
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if.end14: ; preds = %if.end11
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ret i32 0
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}
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declare signext i32 @fn2(...)
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declare signext i32 @fn3(...)
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declare signext i32 @fn4(...)
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