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clang-p2996/llvm/test/CodeGen/PowerPC/cmp_elimination.ll
Guozhi Wei d2210af332 [MBP] Move a latch block with conditional exit and multi predecessors to top of loop 
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
2019-06-14 23:08:59 +00:00

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; RUN: llc -verify-machineinstrs < %s -mtriple=powerpc64-unknown-linux-gnu | FileCheck %s
; RUN: llc -verify-machineinstrs < %s -mtriple=powerpc64le-unknown-linux-gnu | FileCheck %s
; Test cases for compare elimination in PPCMIPeephole pass
define void @func1(i32 signext %a) {
; We should have only one compare instruction
; CHECK-LABEL: @func1
; CHECK: cmp
; CHECK-NOT: cmp
; CHECK: blr
entry:
%cmp = icmp eq i32 %a, 100
br i1 %cmp, label %if.then, label %if.else
if.then:
tail call void @dummy1()
br label %if.end3
if.else:
%cmp1 = icmp slt i32 %a, 100
br i1 %cmp1, label %if.then2, label %if.end3
if.then2:
tail call void @dummy2()
br label %if.end3
if.end3:
ret void
}
define void @func2(i32 signext %a) {
; CHECK-LABEL: @func2
; CHECK: cmp
; CHECK-NOT: cmp
; CHECK: blr
entry:
%cmp = icmp slt i32 %a, 100
br i1 %cmp, label %if.then, label %if.else
if.then:
tail call void @dummy1()
br label %if.end3
if.else:
%cmp1 = icmp eq i32 %a, 100
br i1 %cmp1, label %if.end3, label %if.then2
if.then2:
tail call void @dummy2()
br label %if.end3
if.end3:
ret void
}
define void @func3(i32 signext %a) {
; CHECK-LABEL: @func3
; CHECK: cmp
; CHECK-NOT: cmp
; CHECK: blr
entry:
%cmp = icmp sgt i32 %a, 100
br i1 %cmp, label %if.then, label %if.else
if.then:
tail call void @dummy1()
br label %if.end3
if.else:
%cmp1 = icmp eq i32 %a, 100
br i1 %cmp1, label %if.then2, label %if.end3
if.then2:
tail call void @dummy2()
br label %if.end3
if.end3:
ret void
}
define void @func4(i32 zeroext %a) {
; CHECK-LABEL: @func4
; CHECK: cmp
; CHECK-NOT: cmp
; CHECK: blr
entry:
%cmp = icmp eq i32 %a, 100
br i1 %cmp, label %if.then, label %if.else
if.then:
tail call void @dummy1()
br label %if.end3
if.else:
%cmp1 = icmp ult i32 %a, 100
br i1 %cmp1, label %if.then2, label %if.end3
if.then2:
tail call void @dummy2()
br label %if.end3
if.end3:
ret void
}
define void @func5(i32 zeroext %a) {
; CHECK-LABEL: @func5
; CHECK: cmp
; CHECK-NOT: cmp
; CHECK: blr
entry:
%cmp = icmp ult i32 %a, 100
br i1 %cmp, label %if.then, label %if.else
if.then:
tail call void @dummy1()
br label %if.end3
if.else:
%cmp1 = icmp eq i32 %a, 100
br i1 %cmp1, label %if.end3, label %if.then2
if.then2:
tail call void @dummy2()
br label %if.end3
if.end3:
ret void
}
define void @func6(i32 zeroext %a) {
; CHECK-LABEL: @func6
; CHECK: cmp
; CHECK-NOT: cmp
; CHECK: blr
entry:
%cmp = icmp ugt i32 %a, 100
br i1 %cmp, label %if.then, label %if.else
if.then:
tail call void @dummy1()
br label %if.end3
if.else:
%cmp1 = icmp eq i32 %a, 100
br i1 %cmp1, label %if.then2, label %if.end3
if.then2:
tail call void @dummy2()
br label %if.end3
if.end3:
ret void
}
define void @func7(i64 %a) {
; CHECK-LABEL: @func7
; CHECK: cmp
; CHECK-NOT: cmp
; CHECK: blr
entry:
%cmp = icmp eq i64 %a, 100
br i1 %cmp, label %if.then, label %if.else
if.then:
tail call void @dummy1()
br label %if.end3
if.else:
%cmp1 = icmp slt i64 %a, 100
br i1 %cmp1, label %if.then2, label %if.end3
if.then2:
tail call void @dummy2()
br label %if.end3
if.end3:
ret void
}
define void @func8(i64 %a) {
; CHECK-LABEL: @func8
; CHECK: cmp
; CHECK-NOT: cmp
; CHECK: blr
entry:
%cmp = icmp slt i64 %a, 100
br i1 %cmp, label %if.then, label %if.else
if.then:
tail call void @dummy1()
br label %if.end3
if.else:
%cmp1 = icmp eq i64 %a, 100
br i1 %cmp1, label %if.end3, label %if.then2
if.then2:
tail call void @dummy2()
br label %if.end3
if.end3:
ret void
}
define void @func9(i64 %a) {
; CHECK-LABEL: @func9
; CHECK: cmp
; CHECK-NOT: cmp
; CHECK: blr
entry:
%cmp = icmp sgt i64 %a, 100
br i1 %cmp, label %if.then, label %if.else
if.then:
tail call void @dummy1()
br label %if.end3
if.else:
%cmp1 = icmp eq i64 %a, 100
br i1 %cmp1, label %if.then2, label %if.end3
if.then2:
tail call void @dummy2()
br label %if.end3
if.end3:
ret void
}
define void @func10(i64 %a) {
; CHECK-LABEL: @func10
; CHECK: cmp
; CHECK-NOT: cmp
; CHECK: blr
entry:
%cmp = icmp eq i64 %a, 100
br i1 %cmp, label %if.then, label %if.else
if.then:
tail call void @dummy1()
br label %if.end3
if.else:
%cmp1 = icmp ult i64 %a, 100
br i1 %cmp1, label %if.then2, label %if.end3
if.then2:
tail call void @dummy2()
br label %if.end3
if.end3:
ret void
}
define void @func11(i64 %a) {
; CHECK-LABEL: @func11
; CHECK: cmp
; CHECK-NOT: cmp
; CHECK: blr
entry:
%cmp = icmp ult i64 %a, 100
br i1 %cmp, label %if.then, label %if.else
if.then:
tail call void @dummy1()
br label %if.end3
if.else:
%cmp1 = icmp eq i64 %a, 100
br i1 %cmp1, label %if.end3, label %if.then2
if.then2:
tail call void @dummy2()
br label %if.end3
if.end3:
ret void
}
define void @func12(i64 %a) {
; CHECK-LABEL: @func12
; CHECK: cmp
; CHECK-NOT: cmp
; CHECK: blr
entry:
%cmp = icmp ugt i64 %a, 100
br i1 %cmp, label %if.then, label %if.else
if.then:
tail call void @dummy1()
br label %if.end3
if.else:
%cmp1 = icmp eq i64 %a, 100
br i1 %cmp1, label %if.then2, label %if.end3
if.then2:
tail call void @dummy2()
br label %if.end3
if.end3:
ret void
}
define void @func13(i32 signext %a, i32 signext %b) {
; CHECK-LABEL: @func13
; CHECK: cmp
; CHECK-NOT: cmp
; CHECK: blr
entry:
%cmp = icmp eq i32 %a, %b
br i1 %cmp, label %if.then, label %if.else
if.then:
tail call void @dummy1()
br label %if.end3
if.else:
%cmp1 = icmp slt i32 %a, %b
br i1 %cmp1, label %if.then2, label %if.end3
if.then2:
tail call void @dummy2()
br label %if.end3
if.end3:
ret void
}
define void @func14(i32 signext %a, i32 signext %b) {
; CHECK-LABEL: @func14
; CHECK: cmp
; CHECK-NOT: cmp
; CHECK: blr
entry:
%cmp = icmp slt i32 %a, %b
br i1 %cmp, label %if.then, label %if.else
if.then:
tail call void @dummy1()
br label %if.end3
if.else:
%cmp1 = icmp sgt i32 %a, %b
br i1 %cmp1, label %if.then2, label %if.end3
if.then2:
tail call void @dummy2()
br label %if.end3
if.end3:
ret void
}
define void @func15(i32 signext %a, i32 signext %b) {
; CHECK-LABEL: @func15
; CHECK: cmp
; CHECK-NOT: cmp
; CHECK: blr
entry:
%cmp = icmp slt i32 %b, %a
br i1 %cmp, label %if.then, label %if.else
if.then:
tail call void @dummy1()
br label %if.end3
if.else:
%cmp1 = icmp eq i32 %a, %b
br i1 %cmp1, label %if.then2, label %if.end3
if.then2:
tail call void @dummy2()
br label %if.end3
if.end3:
ret void
}
define void @func16(i32 zeroext %a, i32 zeroext %b) {
; CHECK-LABEL: @func16
; CHECK: cmp
; CHECK-NOT: cmp
; CHECK: blr
entry:
%cmp = icmp eq i32 %a, %b
br i1 %cmp, label %if.then, label %if.else
if.then:
tail call void @dummy1()
br label %if.end3
if.else:
%cmp1 = icmp ult i32 %a, %b
br i1 %cmp1, label %if.then2, label %if.end3
if.then2:
tail call void @dummy2()
br label %if.end3
if.end3:
ret void
}
define void @func17(i32 zeroext %a, i32 zeroext %b) {
; CHECK-LABEL: @func17
; CHECK: cmp
; CHECK-NOT: cmp
; CHECK: blr
entry:
%cmp = icmp ult i32 %a, %b
br i1 %cmp, label %if.then, label %if.else
if.then:
tail call void @dummy1()
br label %if.end3
if.else:
%cmp1 = icmp ugt i32 %a, %b
br i1 %cmp1, label %if.then2, label %if.end3
if.then2:
tail call void @dummy2()
br label %if.end3
if.end3:
ret void
}
define void @func18(i32 zeroext %a, i32 zeroext %b) {
; CHECK-LABEL: @func18
; CHECK: cmp
; CHECK-NOT: cmp
; CHECK: blr
entry:
%cmp = icmp ult i32 %b, %a
br i1 %cmp, label %if.then, label %if.else
if.then:
tail call void @dummy1()
br label %if.end3
if.else:
%cmp1 = icmp eq i32 %a, %b
br i1 %cmp1, label %if.then2, label %if.end3
if.then2:
tail call void @dummy2()
br label %if.end3
if.end3:
ret void
}
define void @func19(i64 %a, i64 %b) {
; CHECK-LABEL: @func19
; CHECK: cmp
; CHECK-NOT: cmp
; CHECK: blr
entry:
%cmp = icmp eq i64 %a, %b
br i1 %cmp, label %if.then, label %if.else
if.then:
tail call void @dummy1()
br label %if.end3
if.else:
%cmp1 = icmp slt i64 %a, %b
br i1 %cmp1, label %if.then2, label %if.end3
if.then2:
tail call void @dummy2()
br label %if.end3
if.end3:
ret void
}
define void @func20(i64 %a, i64 %b) {
; CHECK-LABEL: @func20
; CHECK: cmp
; CHECK-NOT: cmp
; CHECK: blr
entry:
%cmp = icmp slt i64 %a, %b
br i1 %cmp, label %if.then, label %if.else
if.then:
tail call void @dummy1()
br label %if.end3
if.else:
%cmp1 = icmp sgt i64 %a, %b
br i1 %cmp1, label %if.then2, label %if.end3
if.then2:
tail call void @dummy2()
br label %if.end3
if.end3:
ret void
}
define void @func21(i64 %a, i64 %b) {
; CHECK-LABEL: @func21
; CHECK: cmp
; CHECK-NOT: cmp
; CHECK: blr
entry:
%cmp = icmp slt i64 %b, %a
br i1 %cmp, label %if.then, label %if.else
if.then:
tail call void @dummy1()
br label %if.end3
if.else:
%cmp1 = icmp eq i64 %a, %b
br i1 %cmp1, label %if.then2, label %if.end3
if.then2:
tail call void @dummy2()
br label %if.end3
if.end3:
ret void
}
define void @func22(i64 %a, i64 %b) {
; CHECK-LABEL: @func22
; CHECK: cmp
; CHECK-NOT: cmp
; CHECK: blr
entry:
%cmp = icmp eq i64 %a, %b
br i1 %cmp, label %if.then, label %if.else
if.then:
tail call void @dummy1()
br label %if.end3
if.else:
%cmp1 = icmp ult i64 %a, %b
br i1 %cmp1, label %if.then2, label %if.end3
if.then2:
tail call void @dummy2()
br label %if.end3
if.end3:
ret void
}
define void @func23(i64 %a, i64 %b) {
; CHECK-LABEL: @func23
; CHECK: cmp
; CHECK-NOT: cmp
; CHECK: blr
entry:
%cmp = icmp ult i64 %a, %b
br i1 %cmp, label %if.then, label %if.else
if.then:
tail call void @dummy1()
br label %if.end3
if.else:
%cmp1 = icmp ugt i64 %a, %b
br i1 %cmp1, label %if.then2, label %if.end3
if.then2:
tail call void @dummy2()
br label %if.end3
if.end3:
ret void
}
define void @func24(i64 %a, i64 %b) {
; CHECK-LABEL: @func24
; CHECK: cmp
; CHECK-NOT: cmp
; CHECK: blr
entry:
%cmp = icmp ult i64 %b, %a
br i1 %cmp, label %if.then, label %if.else
if.then:
tail call void @dummy1()
br label %if.end3
if.else:
%cmp1 = icmp eq i64 %a, %b
br i1 %cmp1, label %if.then2, label %if.end3
if.then2:
tail call void @dummy2()
br label %if.end3
if.end3:
ret void
}
define void @func25(i64 %a, i64 %b) {
; CHECK-LABEL: @func25
; CHECK: cmp
; CHECK-NOT: cmp
; CHECK: blr
entry:
%cmp = icmp slt i64 %b, %a
br i1 %cmp, label %if.then, label %if.else, !prof !1
if.then:
tail call void @dummy1()
br label %if.end6
if.else:
%cmp2 = icmp eq i64 %a, %b
br i1 %cmp2, label %if.then4, label %if.else5
if.then4:
tail call void @dummy2()
br label %if.end6
if.else5:
tail call void @dummy3()
br label %if.end6
if.end6:
ret void
}
define void @func26(i32 signext %a) {
; CHECK-LABEL: @func26
; CHECK: cmp
; CHECK-NOT: cmp
; CHECK: blr
entry:
%cmp = icmp sgt i32 %a, 0
br i1 %cmp, label %if.then, label %if.else, !prof !2
if.then:
tail call void @dummy1()
br label %if.end9
if.else:
%cmp2 = icmp eq i32 %a, 0
br i1 %cmp2, label %if.then7, label %if.else8, !prof !2
if.then7:
tail call void @dummy2()
br label %if.end9
if.else8:
tail call void @dummy3()
br label %if.end9
if.end9:
ret void
}
@g1 = external local_unnamed_addr global i32, align 4
@g2 = external local_unnamed_addr global i32, align 4
define void @func27(i32 signext %a) {
; CHECK-LABEL: @func27
; CHECK: cmp
; CHECK: beq
; CHECK-NOT: cmp
; CHECK: bgelr
; CHECK: blr
entry:
%cmp = icmp eq i32 %a, 0
br i1 %cmp, label %if.end3.sink.split, label %if.else
if.else:
%cmp1 = icmp slt i32 %a, 0
br i1 %cmp1, label %if.end3.sink.split, label %if.end
if.end3.sink.split:
%g2.sink = phi i32* [ @g2, %if.else ], [ @g1, %entry ]
store i32 0, i32* %g2.sink, align 4
br label %if.end
if.end:
ret void
}
; partially redundant case
define void @func28(i32 signext %a) {
; CHECK-LABEL: @func28
; CHECK: cmplwi [[REG1:[0-9]+]], [[REG2:[0-9]+]]
; CHECK: .[[LABEL2:[A-Z0-9_]+]]:
; CHECK: cmpwi [[REG1]], [[REG2]]
; CHECK: ble 0, .[[LABEL1:[A-Z0-9_]+]]
; CHECK-NOT: cmp
; CHECK: bne 0, .[[LABEL2]]
; CHECK: bl dummy1
; CHECK: b .[[LABEL2]]
; CHECK: .[[LABEL1]]:
; CHECK: blr
entry:
br label %do.body
do.body:
%a.addr.0 = phi i32 [ %a, %entry ], [ %call, %if.end ]
%cmp = icmp eq i32 %a.addr.0, 0
br i1 %cmp, label %if.then, label %if.end
if.then:
tail call void @dummy1() #2
br label %if.end
if.end:
%call = tail call signext i32 @func(i32 signext %a.addr.0) #2
%cmp1 = icmp sgt i32 %call, 0
br i1 %cmp1, label %do.body, label %do.end
do.end:
ret void
}
define void @func29(i32 signext %a) {
; We cannot merge two compares due to difference in sign extension behaviors.
; equivalent C code example:
; int a = .. ;
; if (a == -1) dummy1();
; if (a == (uint16_t)-1) dummy2();
; CHECK-LABEL: @func29
; CHECK: cmp
; CHECK: cmp
; CHECK: blr
entry:
%cmp = icmp eq i32 %a, -1
br i1 %cmp, label %if.then, label %if.else
if.then:
tail call void @dummy1()
br label %if.end3
if.else:
%cmp1 = icmp eq i32 %a, 65535
br i1 %cmp1, label %if.then2, label %if.end3
if.then2:
tail call void @dummy2()
br label %if.end3
if.end3:
ret void
}
declare void @dummy1()
declare void @dummy2()
declare void @dummy3()
declare signext i32 @func(i32 signext)
!1 = !{!"branch_weights", i32 2000, i32 1}
!2 = !{!"branch_weights", i32 1, i32 2000}
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