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; RUN: opt < %s -indvars -S | FileCheck %s
; RUN: opt -lcssa -loop-simplify -S < %s | opt -S -passes='require<targetir>,require<scalar-evolution>,require<domtree>,loop(indvars)'
; Provide legal integer types.
target datalayout = "n8:16:32:64"
target triple = "x86_64-apple-darwin"
declare void @use(i64 %x)
; CHECK-LABEL: @loop_0
; CHECK-LABEL: B18:
; Only one phi now.
; CHECK: phi i64
; CHECK-NOT: phi
; One trunc for the gep.
; CHECK: trunc i64 %indvars.iv to i32
; One trunc for the dummy() call.
; CHECK-LABEL: exit24:
; CHECK: trunc i64 {{.*}}lcssa.wide to i32
define void @loop_0(i32* %a) {
Prologue:
br i1 undef, label %B18, label %B6
B18: ; preds = %B24, %Prologue
%.02 = phi i32 [ 0, %Prologue ], [ %tmp33, %B24 ]
%tmp23 = zext i32 %.02 to i64
call void @use(i64 %tmp23)
%tmp33 = add i32 %.02, 1
%o = getelementptr i32, i32* %a, i32 %.02
%v = load i32, i32* %o
%t = icmp eq i32 %v, 0
br i1 %t, label %exit24, label %B24
B24: ; preds = %B18
%t2 = icmp eq i32 %tmp33, 20
br i1 %t2, label %B6, label %B18
B6: ; preds = %Prologue
ret void
exit24: ; preds = %B18
call void @dummy(i32 %.02)
unreachable
}
; Make sure that dead zext is removed and no widening happens.
; CHECK-LABEL: @loop_0.dead
; CHECK: phi i32
; CHECK-NOT: zext
; CHECK-NOT: trunc
define void @loop_0.dead(i32* %a) {
Prologue:
br i1 undef, label %B18, label %B6
B18: ; preds = %B24, %Prologue
%.02 = phi i32 [ 0, %Prologue ], [ %tmp33, %B24 ]
%tmp23 = zext i32 %.02 to i64
%tmp33 = add i32 %.02, 1
%o = getelementptr i32, i32* %a, i32 %.02
%v = load i32, i32* %o
%t = icmp eq i32 %v, 0
br i1 %t, label %exit24, label %B24
B24: ; preds = %B18
%t2 = icmp eq i32 %tmp33, 20
br i1 %t2, label %B6, label %B18
B6: ; preds = %Prologue
ret void
exit24: ; preds = %B18
call void @dummy(i32 %.02)
unreachable
}
define void @loop_1(i32 %lim) {
; CHECK-LABEL: @loop_1(
entry:
%entry.cond = icmp ne i32 %lim, 0
br i1 %entry.cond, label %loop, label %leave
loop:
; CHECK: loop:
; CHECK: %indvars.iv = phi i64 [ 1, %loop.preheader ], [ %indvars.iv.next, %loop ]
; CHECK: %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
; CHECK: [[IV_INC:%[^ ]+]] = add nsw i64 %indvars.iv, -1
; CHECK: call void @dummy.i64(i64 [[IV_INC]])
%iv = phi i32 [ 1, %entry ], [ %iv.inc, %loop ]
%iv.inc = add i32 %iv, 1
%iv.inc.sub = add i32 %iv, -1
%iv.inc.sub.zext = zext i32 %iv.inc.sub to i64
call void @dummy.i64(i64 %iv.inc.sub.zext)
%be.cond = icmp ult i32 %iv.inc, %lim
br i1 %be.cond, label %loop, label %leave
leave:
ret void
}
declare void @dummy(i32)
declare void @dummy.i64(i64)
define void @loop_2(i32 %size, i32 %nsteps, i32 %hsize, i32* %lined, i8 %tmp1) {
; CHECK-LABEL: @loop_2(
entry:
%cmp215 = icmp sgt i32 %size, 1
%tmp0 = bitcast i32* %lined to i8*
br label %for.body
for.body:
%j = phi i32 [ 0, %entry ], [ %inc6, %for.inc ]
%mul = mul nsw i32 %j, %size
%add = add nsw i32 %mul, %hsize
br i1 %cmp215, label %for.body2, label %for.inc
; check that the induction variable of the inner loop has been widened after indvars.
; CHECK: [[INNERLOOPINV:%[^ ]+]] = add nsw i64
; CHECK: for.body2:
; CHECK-NEXT: %indvars.iv = phi i64 [ 1, %for.body2.preheader ], [ %indvars.iv.next, %for.body2 ]
; CHECK-NEXT: [[WIDENED:%[^ ]+]] = add nsw i64 [[INNERLOOPINV]], %indvars.iv
; CHECK-NEXT: %add.ptr = getelementptr inbounds i8, i8* %tmp0, i64 [[WIDENED]]
for.body2:
%k = phi i32 [ %inc, %for.body2 ], [ 1, %for.body ]
%add4 = add nsw i32 %add, %k
%idx.ext = sext i32 %add4 to i64
%add.ptr = getelementptr inbounds i8, i8* %tmp0, i64 %idx.ext
store i8 %tmp1, i8* %add.ptr, align 1
%inc = add nsw i32 %k, 1
%cmp2 = icmp slt i32 %inc, %size
br i1 %cmp2, label %for.body2, label %for.body3
; check that the induction variable of the inner loop has been widened after indvars.
; CHECK: for.body3.preheader:
; CHECK: [[INNERLOOPINV:%[^ ]+]] = zext i32
; CHECK: for.body3:
; CHECK-NEXT: %indvars.iv2 = phi i64 [ 1, %for.body3.preheader ], [ %indvars.iv.next3, %for.body3 ]
; CHECK-NEXT: [[WIDENED:%[^ ]+]] = add nuw nsw i64 [[INNERLOOPINV]], %indvars.iv2
; CHECK-NEXT: %add.ptr2 = getelementptr inbounds i8, i8* %tmp0, i64 [[WIDENED]]
for.body3:
%l = phi i32 [ %inc2, %for.body3 ], [ 1, %for.body2 ]
%add5 = add nuw i32 %add, %l
%idx.ext2 = zext i32 %add5 to i64
%add.ptr2 = getelementptr inbounds i8, i8* %tmp0, i64 %idx.ext2
store i8 %tmp1, i8* %add.ptr2, align 1
%inc2 = add nsw i32 %l, 1
%cmp3 = icmp slt i32 %inc2, %size
br i1 %cmp3, label %for.body3, label %for.inc
for.inc:
%inc6 = add nsw i32 %j, 1
%cmp = icmp slt i32 %inc6, %nsteps
br i1 %cmp, label %for.body, label %for.end.loopexit
for.end.loopexit:
ret void
}
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