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lsr-term-fold.ll
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lsr-term-fold.ll
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -passes="loop-reduce" -S -lsr-term-fold | FileCheck %s
target datalayout = "e-p:64:64:64-n64"
define void @const_tripcount(ptr %a) {
; CHECK-LABEL: @const_tripcount(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[UGLYGEP:%.*]] = getelementptr i8, ptr [[A:%.*]], i64 84
; CHECK-NEXT: [[SCEVGEP:%.*]] = getelementptr i8, ptr [[A]], i64 1600
; CHECK-NEXT: br label [[FOR_BODY:%.*]]
; CHECK: for.body:
; CHECK-NEXT: [[LSR_IV1:%.*]] = phi ptr [ [[UGLYGEP2:%.*]], [[FOR_BODY]] ], [ [[UGLYGEP]], [[ENTRY:%.*]] ]
; CHECK-NEXT: store i32 1, ptr [[LSR_IV1]], align 4
; CHECK-NEXT: [[UGLYGEP2]] = getelementptr i8, ptr [[LSR_IV1]], i64 4
; CHECK-NEXT: [[LSR_FOLD_TERM_COND_REPLACED_TERM_COND:%.*]] = icmp eq ptr [[UGLYGEP2]], [[SCEVGEP]]
; CHECK-NEXT: br i1 [[LSR_FOLD_TERM_COND_REPLACED_TERM_COND]], label [[FOR_END:%.*]], label [[FOR_BODY]]
; CHECK: for.end:
; CHECK-NEXT: ret void
;
entry:
%uglygep = getelementptr i8, ptr %a, i64 84
br label %for.body
for.body: ; preds = %for.body, %entry
%lsr.iv1 = phi ptr [ %uglygep2, %for.body ], [ %uglygep, %entry ]
%lsr.iv = phi i64 [ %lsr.iv.next, %for.body ], [ 379, %entry ]
store i32 1, ptr %lsr.iv1, align 4
%lsr.iv.next = add nsw i64 %lsr.iv, -1
%uglygep2 = getelementptr i8, ptr %lsr.iv1, i64 4
%exitcond.not = icmp eq i64 %lsr.iv.next, 0
br i1 %exitcond.not, label %for.end, label %for.body
for.end: ; preds = %for.body
ret void
}
define void @runtime_tripcount(ptr %a, i32 %N) {
; CHECK-LABEL: @runtime_tripcount(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[UGLYGEP:%.*]] = getelementptr i8, ptr [[A:%.*]], i32 84
; CHECK-NEXT: [[TMP0:%.*]] = add nsw i32 [[N:%.*]], -1
; CHECK-NEXT: [[TMP1:%.*]] = zext i32 [[TMP0]] to i64
; CHECK-NEXT: [[TMP2:%.*]] = shl nuw nsw i64 [[TMP1]], 2
; CHECK-NEXT: [[TMP3:%.*]] = add nuw nsw i64 [[TMP2]], 88
; CHECK-NEXT: [[SCEVGEP:%.*]] = getelementptr i8, ptr [[A]], i64 [[TMP3]]
; CHECK-NEXT: br label [[FOR_BODY:%.*]]
; CHECK: for.body:
; CHECK-NEXT: [[LSR_IV1:%.*]] = phi ptr [ [[UGLYGEP2:%.*]], [[FOR_BODY]] ], [ [[UGLYGEP]], [[ENTRY:%.*]] ]
; CHECK-NEXT: store i32 1, ptr [[LSR_IV1]], align 4
; CHECK-NEXT: [[UGLYGEP2]] = getelementptr i8, ptr [[LSR_IV1]], i64 4
; CHECK-NEXT: [[LSR_FOLD_TERM_COND_REPLACED_TERM_COND:%.*]] = icmp eq ptr [[UGLYGEP2]], [[SCEVGEP]]
; CHECK-NEXT: br i1 [[LSR_FOLD_TERM_COND_REPLACED_TERM_COND]], label [[FOR_END:%.*]], label [[FOR_BODY]]
; CHECK: for.end:
; CHECK-NEXT: ret void
;
entry:
%uglygep = getelementptr i8, ptr %a, i32 84
br label %for.body
for.body: ; preds = %for.body, %entry
%lsr.iv1 = phi ptr [ %uglygep2, %for.body ], [ %uglygep, %entry ]
%lsr.iv = phi i32 [ %lsr.iv.next, %for.body ], [ %N, %entry ]
store i32 1, ptr %lsr.iv1, align 4
%lsr.iv.next = add nsw i32 %lsr.iv, -1
%uglygep2 = getelementptr i8, ptr %lsr.iv1, i64 4
%exitcond.not = icmp eq i32 %lsr.iv.next, 0
br i1 %exitcond.not, label %for.end, label %for.body
for.end: ; preds = %for.body
ret void
}
; In this case, the i8 IVs increment *isn't* nsw. As a result, a N of 0
; is well defined, and thus the post-inc starts at 255.
define void @wrap_around(ptr %a, i8 %N) {
; CHECK-LABEL: @wrap_around(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = add i8 [[N:%.*]], -1
; CHECK-NEXT: [[TMP1:%.*]] = zext i8 [[TMP0]] to i64
; CHECK-NEXT: [[TMP2:%.*]] = shl nuw nsw i64 [[TMP1]], 2
; CHECK-NEXT: [[TMP3:%.*]] = add nuw nsw i64 [[TMP2]], 4
; CHECK-NEXT: [[SCEVGEP:%.*]] = getelementptr i8, ptr [[A:%.*]], i64 [[TMP3]]
; CHECK-NEXT: br label [[FOR_BODY:%.*]]
; CHECK: for.body:
; CHECK-NEXT: [[LSR_IV1:%.*]] = phi ptr [ [[UGLYGEP2:%.*]], [[FOR_BODY]] ], [ [[A]], [[ENTRY:%.*]] ]
; CHECK-NEXT: store i8 1, ptr [[LSR_IV1]], align 4
; CHECK-NEXT: [[UGLYGEP2]] = getelementptr i8, ptr [[LSR_IV1]], i64 4
; CHECK-NEXT: [[LSR_FOLD_TERM_COND_REPLACED_TERM_COND:%.*]] = icmp eq ptr [[UGLYGEP2]], [[SCEVGEP]]
; CHECK-NEXT: br i1 [[LSR_FOLD_TERM_COND_REPLACED_TERM_COND]], label [[FOR_END:%.*]], label [[FOR_BODY]]
; CHECK: for.end:
; CHECK-NEXT: ret void
;
entry:
br label %for.body
for.body: ; preds = %for.body, %entry
%lsr.iv1 = phi ptr [ %uglygep2, %for.body ], [ %a, %entry ]
%lsr.iv = phi i8 [ %lsr.iv.next, %for.body ], [ %N, %entry ]
store i8 1, ptr %lsr.iv1, align 4
%lsr.iv.next = add i8 %lsr.iv, -1
%uglygep2 = getelementptr i8, ptr %lsr.iv1, i64 4
%exitcond.not = icmp eq i8 %lsr.iv.next, 0
br i1 %exitcond.not, label %for.end, label %for.body
for.end: ; preds = %for.body
ret void
}
; The replacing AddRec IV is a complicated AddRec. This tests whether
; the fold terminating condition transformation is writing new terminating
; condition in the correct type.
define void @ptr_of_ptr_addrec(ptr %ptrptr, i32 %length) {
; CHECK-LABEL: @ptr_of_ptr_addrec(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[START_PTRPTR:%.*]] = getelementptr ptr, ptr [[PTRPTR:%.*]]
; CHECK-NEXT: [[TMP0:%.*]] = add i32 [[LENGTH:%.*]], -1
; CHECK-NEXT: [[TMP1:%.*]] = zext i32 [[TMP0]] to i64
; CHECK-NEXT: [[TMP2:%.*]] = shl nuw nsw i64 [[TMP1]], 3
; CHECK-NEXT: [[TMP3:%.*]] = add nuw nsw i64 [[TMP2]], 8
; CHECK-NEXT: [[SCEVGEP:%.*]] = getelementptr i8, ptr [[START_PTRPTR]], i64 [[TMP3]]
; CHECK-NEXT: br label [[FOR_BODY:%.*]]
; CHECK: for.body:
; CHECK-NEXT: [[IT_04:%.*]] = phi ptr [ [[INCDEC_PTR:%.*]], [[FOR_BODY]] ], [ [[START_PTRPTR]], [[ENTRY:%.*]] ]
; CHECK-NEXT: [[TMP4:%.*]] = load ptr, ptr [[IT_04]], align 8
; CHECK-NEXT: tail call void @foo(ptr [[TMP4]])
; CHECK-NEXT: [[INCDEC_PTR]] = getelementptr inbounds ptr, ptr [[IT_04]], i64 1
; CHECK-NEXT: [[LSR_FOLD_TERM_COND_REPLACED_TERM_COND:%.*]] = icmp eq ptr [[INCDEC_PTR]], [[SCEVGEP]]
; CHECK-NEXT: br i1 [[LSR_FOLD_TERM_COND_REPLACED_TERM_COND]], label [[FOR_END:%.*]], label [[FOR_BODY]]
; CHECK: for.end:
; CHECK-NEXT: ret void
;
entry:
%start.ptrptr = getelementptr inbounds ptr, ptr %ptrptr
br label %for.body
for.body: ; preds = %entry, %for.body
%i.05 = phi i32 [ %dec, %for.body ], [ %length, %entry ]
%it.04 = phi ptr [ %incdec.ptr, %for.body ], [ %start.ptrptr, %entry ]
%0 = load ptr, ptr %it.04, align 8
tail call void @foo(ptr %0)
%incdec.ptr = getelementptr inbounds ptr, ptr %it.04, i64 1
%dec = add nsw i32 %i.05, -1
%tobool.not = icmp eq i32 %dec, 0
br i1 %tobool.not, label %for.end, label %for.body
for.end: ; preds = %for.body
ret void
}
declare void @foo(ptr)
define void @iv_start_non_preheader(ptr %mark, i32 signext %length) {
; CHECK-LABEL: @iv_start_non_preheader(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TOBOOL_NOT3:%.*]] = icmp eq i32 [[LENGTH:%.*]], 0
; CHECK-NEXT: br i1 [[TOBOOL_NOT3]], label [[FOR_COND_CLEANUP:%.*]], label [[FOR_BODY_PREHEADER:%.*]]
; CHECK: for.body.preheader:
; CHECK-NEXT: [[TMP0:%.*]] = add i32 [[LENGTH]], -1
; CHECK-NEXT: [[TMP1:%.*]] = zext i32 [[TMP0]] to i64
; CHECK-NEXT: [[TMP2:%.*]] = shl nuw nsw i64 [[TMP1]], 3
; CHECK-NEXT: [[TMP3:%.*]] = add nuw nsw i64 [[TMP2]], 8
; CHECK-NEXT: [[SCEVGEP:%.*]] = getelementptr i8, ptr [[MARK:%.*]], i64 [[TMP3]]
; CHECK-NEXT: br label [[FOR_BODY:%.*]]
; CHECK: for.cond.cleanup.loopexit:
; CHECK-NEXT: br label [[FOR_COND_CLEANUP]]
; CHECK: for.cond.cleanup:
; CHECK-NEXT: ret void
; CHECK: for.body:
; CHECK-NEXT: [[DST_04:%.*]] = phi ptr [ [[INCDEC_PTR:%.*]], [[FOR_BODY]] ], [ [[MARK]], [[FOR_BODY_PREHEADER]] ]
; CHECK-NEXT: [[TMP4:%.*]] = load ptr, ptr [[DST_04]], align 8
; CHECK-NEXT: [[TMP5:%.*]] = call ptr @foo(ptr [[TMP4]])
; CHECK-NEXT: [[INCDEC_PTR]] = getelementptr inbounds ptr, ptr [[DST_04]], i64 1
; CHECK-NEXT: [[LSR_FOLD_TERM_COND_REPLACED_TERM_COND:%.*]] = icmp eq ptr [[INCDEC_PTR]], [[SCEVGEP]]
; CHECK-NEXT: br i1 [[LSR_FOLD_TERM_COND_REPLACED_TERM_COND]], label [[FOR_COND_CLEANUP_LOOPEXIT:%.*]], label [[FOR_BODY]]
;
entry:
%tobool.not3 = icmp eq i32 %length, 0
br i1 %tobool.not3, label %for.cond.cleanup, label %for.body
for.cond.cleanup: ; preds = %for.body, %entry
ret void
for.body: ; preds = %entry, %for.body
%i.05 = phi i32 [ %dec, %for.body ], [ %length, %entry ]
%dst.04 = phi ptr [ %incdec.ptr, %for.body ], [ %mark, %entry ]
%0 = load ptr, ptr %dst.04, align 8
call ptr @foo(ptr %0)
%incdec.ptr = getelementptr inbounds ptr, ptr %dst.04, i64 1
%dec = add nsw i32 %i.05, -1
%tobool.not = icmp eq i32 %dec, 0
br i1 %tobool.not, label %for.cond.cleanup, label %for.body
}
; Consider the case where %a points to a buffer exactly 17 bytes long. The
; loop below will access bytes: 0, 4, 8, and 16. The key bit is that we
; advance the pointer IV by *4* each time, and thus on the iteration we write
; byte 16, %uglygep2 (the pointer increment) is past the end of the underlying
; storage and thus violates the inbounds requirements. As a result, %uglygep2
; is poison on the final iteration. If we insert a branch on that value, we
; have inserted undefined behavior where it did not previously exist.
; FIXME: miscompile
define void @inbounds_poison_use(ptr %a) {
; CHECK-LABEL: @inbounds_poison_use(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[SCEVGEP:%.*]] = getelementptr i8, ptr [[A:%.*]], i64 16
; CHECK-NEXT: br label [[FOR_BODY:%.*]]
; CHECK: for.body:
; CHECK-NEXT: [[LSR_IV1:%.*]] = phi ptr [ [[UGLYGEP2:%.*]], [[FOR_BODY]] ], [ [[A]], [[ENTRY:%.*]] ]
; CHECK-NEXT: store i8 1, ptr [[LSR_IV1]], align 4
; CHECK-NEXT: [[UGLYGEP2]] = getelementptr inbounds i8, ptr [[LSR_IV1]], i64 4
; CHECK-NEXT: [[LSR_FOLD_TERM_COND_REPLACED_TERM_COND:%.*]] = icmp eq ptr [[UGLYGEP2]], [[SCEVGEP]]
; CHECK-NEXT: br i1 [[LSR_FOLD_TERM_COND_REPLACED_TERM_COND]], label [[FOR_END:%.*]], label [[FOR_BODY]]
; CHECK: for.end:
; CHECK-NEXT: ret void
;
entry:
br label %for.body
for.body: ; preds = %for.body, %entry
%lsr.iv1 = phi ptr [ %uglygep2, %for.body ], [ %a, %entry ]
%lsr.iv = phi i32 [ %lsr.iv.next, %for.body ], [ 4, %entry ]
store i8 1, ptr %lsr.iv1, align 4
%lsr.iv.next = add nsw i32 %lsr.iv, -1
%uglygep2 = getelementptr inbounds i8, ptr %lsr.iv1, i64 4
%exitcond.not = icmp eq i32 %lsr.iv.next, 0
br i1 %exitcond.not, label %for.end, label %for.body
for.end: ; preds = %for.body
ret void
}
; In this case, the integer IV has a larger bitwidth than the pointer IV.
; This means that the smaller IV may wrap around multiple times before
; the original loop exit is taken.
define void @iv_size(ptr %a, i128 %N) {
; CHECK-LABEL: @iv_size(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[FOR_BODY:%.*]]
; CHECK: for.body:
; CHECK-NEXT: [[LSR_IV1:%.*]] = phi ptr [ [[UGLYGEP2:%.*]], [[FOR_BODY]] ], [ [[A:%.*]], [[ENTRY:%.*]] ]
; CHECK-NEXT: [[LSR_IV:%.*]] = phi i128 [ [[LSR_IV_NEXT:%.*]], [[FOR_BODY]] ], [ [[N:%.*]], [[ENTRY]] ]
; CHECK-NEXT: store i32 1, ptr [[LSR_IV1]], align 4
; CHECK-NEXT: [[LSR_IV_NEXT]] = add nsw i128 [[LSR_IV]], -1
; CHECK-NEXT: [[UGLYGEP2]] = getelementptr i8, ptr [[LSR_IV1]], i64 4
; CHECK-NEXT: [[EXITCOND_NOT:%.*]] = icmp eq i128 [[LSR_IV_NEXT]], 0
; CHECK-NEXT: br i1 [[EXITCOND_NOT]], label [[FOR_END:%.*]], label [[FOR_BODY]]
; CHECK: for.end:
; CHECK-NEXT: ret void
;
entry:
br label %for.body
for.body: ; preds = %for.body, %entry
%lsr.iv1 = phi ptr [ %uglygep2, %for.body ], [ %a, %entry ]
%lsr.iv = phi i128 [ %lsr.iv.next, %for.body ], [ %N, %entry ]
store i32 1, ptr %lsr.iv1, align 4
%lsr.iv.next = add nsw i128 %lsr.iv, -1
%uglygep2 = getelementptr i8, ptr %lsr.iv1, i64 4
%exitcond.not = icmp eq i128 %lsr.iv.next, 0
br i1 %exitcond.not, label %for.end, label %for.body
for.end: ; preds = %for.body
ret void
}
; To check correct folding not equality terminating condition
; Due to SLE offset must be - 1600
define void @IcmpSle(ptr %a) {
; CHECK-LABEL: @IcmpSle(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[UGLYGEP:%.*]] = getelementptr i8, ptr [[A:%.*]], i32 84
; CHECK-NEXT: [[SCEVGEP:%.*]] = getelementptr i8, ptr [[A]], i64 1600
; CHECK-NEXT: br label [[FOR_BODY:%.*]]
; CHECK: for.body:
; CHECK-NEXT: [[LSR_IV1:%.*]] = phi ptr [ [[UGLYGEP2:%.*]], [[FOR_BODY]] ], [ [[UGLYGEP]], [[ENTRY:%.*]] ]
; CHECK-NEXT: store i32 1, ptr [[LSR_IV1]], align 4
; CHECK-NEXT: [[UGLYGEP2]] = getelementptr i8, ptr [[LSR_IV1]], i32 4
; CHECK-NEXT: [[LSR_FOLD_TERM_COND_REPLACED_TERM_COND:%.*]] = icmp eq ptr [[UGLYGEP2]], [[SCEVGEP]]
; CHECK-NEXT: br i1 [[LSR_FOLD_TERM_COND_REPLACED_TERM_COND]], label [[FOR_END:%.*]], label [[FOR_BODY]]
; CHECK: for.end:
; CHECK-NEXT: ret void
;
entry:
%uglygep = getelementptr i8, ptr %a, i32 84
br label %for.body
for.body: ; preds = %for.body, %entry
%lsr.iv1 = phi ptr [ %uglygep2, %for.body ], [ %uglygep, %entry ]
%lsr.iv = phi i32 [ %lsr.iv.next, %for.body ], [ 379, %entry ]
store i32 1, ptr %lsr.iv1, align 4
%lsr.iv.next = add nsw i32 %lsr.iv, -1
%uglygep2 = getelementptr i8, ptr %lsr.iv1, i32 4
%exitcond.not = icmp sle i32 %lsr.iv.next, 0
br i1 %exitcond.not, label %for.end, label %for.body
for.end: ; preds = %for.body
ret void
}
; Due to SLT offset must be - 1604
define void @IcmpSlt(ptr %a) {
; CHECK-LABEL: @IcmpSlt(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[UGLYGEP:%.*]] = getelementptr i8, ptr [[A:%.*]], i32 84
; CHECK-NEXT: [[SCEVGEP:%.*]] = getelementptr i8, ptr [[A]], i64 1604
; CHECK-NEXT: br label [[FOR_BODY:%.*]]
; CHECK: for.body:
; CHECK-NEXT: [[LSR_IV1:%.*]] = phi ptr [ [[UGLYGEP2:%.*]], [[FOR_BODY]] ], [ [[UGLYGEP]], [[ENTRY:%.*]] ]
; CHECK-NEXT: store i32 1, ptr [[LSR_IV1]], align 4
; CHECK-NEXT: [[UGLYGEP2]] = getelementptr i8, ptr [[LSR_IV1]], i32 4
; CHECK-NEXT: [[LSR_FOLD_TERM_COND_REPLACED_TERM_COND:%.*]] = icmp eq ptr [[UGLYGEP2]], [[SCEVGEP]]
; CHECK-NEXT: br i1 [[LSR_FOLD_TERM_COND_REPLACED_TERM_COND]], label [[FOR_END:%.*]], label [[FOR_BODY]]
; CHECK: for.end:
; CHECK-NEXT: ret void
;
entry:
%uglygep = getelementptr i8, ptr %a, i32 84
br label %for.body
for.body: ; preds = %for.body, %entry
%lsr.iv1 = phi ptr [ %uglygep2, %for.body ], [ %uglygep, %entry ]
%lsr.iv = phi i32 [ %lsr.iv.next, %for.body ], [ 379, %entry ]
store i32 1, ptr %lsr.iv1, align 4
%lsr.iv.next = add nsw i32 %lsr.iv, -1
%uglygep2 = getelementptr i8, ptr %lsr.iv1, i32 4
%exitcond.not = icmp slt i32 %lsr.iv.next, 0
br i1 %exitcond.not, label %for.end, label %for.body
for.end: ; preds = %for.body
ret void
}
; Invert predicate and branches
define void @IcmpSgt(ptr %a) {
; CHECK-LABEL: @IcmpSgt(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[UGLYGEP:%.*]] = getelementptr i8, ptr [[A:%.*]], i32 84
; CHECK-NEXT: [[SCEVGEP:%.*]] = getelementptr i8, ptr [[A]], i64 1600
; CHECK-NEXT: br label [[FOR_BODY:%.*]]
; CHECK: for.body:
; CHECK-NEXT: [[LSR_IV1:%.*]] = phi ptr [ [[UGLYGEP2:%.*]], [[FOR_BODY]] ], [ [[UGLYGEP]], [[ENTRY:%.*]] ]
; CHECK-NEXT: store i32 1, ptr [[LSR_IV1]], align 4
; CHECK-NEXT: [[UGLYGEP2]] = getelementptr i8, ptr [[LSR_IV1]], i32 4
; CHECK-NEXT: [[LSR_FOLD_TERM_COND_REPLACED_TERM_COND:%.*]] = icmp eq ptr [[UGLYGEP2]], [[SCEVGEP]]
; CHECK-NEXT: br i1 [[LSR_FOLD_TERM_COND_REPLACED_TERM_COND]], label [[FOR_END:%.*]], label [[FOR_BODY]]
; CHECK: for.end:
; CHECK-NEXT: ret void
;
entry:
%uglygep = getelementptr i8, ptr %a, i32 84
br label %for.body
for.body: ; preds = %for.body, %entry
%lsr.iv1 = phi ptr [ %uglygep2, %for.body ], [ %uglygep, %entry ]
%lsr.iv = phi i32 [ %lsr.iv.next, %for.body ], [ 379, %entry ]
store i32 1, ptr %lsr.iv1, align 4
%lsr.iv.next = add nsw i32 %lsr.iv, -1
%uglygep2 = getelementptr i8, ptr %lsr.iv1, i32 4
%exitcond.not = icmp sgt i32 %lsr.iv.next, 0
br i1 %exitcond.not, label %for.body, label %for.end
for.end: ; preds = %for.body
ret void
}
; Invert predicate and branches
define void @SeveralLoopLatch(ptr %a) {
; CHECK-LABEL: @SeveralLoopLatch(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[UGLYGEP:%.*]] = getelementptr i8, ptr [[A:%.*]], i32 84
; CHECK-NEXT: [[SCEVGEP:%.*]] = getelementptr i8, ptr [[A]], i64 1600
; CHECK-NEXT: br label [[FOR_BODY:%.*]]
; CHECK: for.body:
; CHECK-NEXT: [[LSR_IV1:%.*]] = phi ptr [ [[UGLYGEP2:%.*]], [[ANOTHER_BRANCH:%.*]] ], [ [[UGLYGEP]], [[ENTRY:%.*]] ]
; CHECK-NEXT: store i32 1, ptr [[LSR_IV1]], align 4
; CHECK-NEXT: [[UGLYGEP2]] = getelementptr i8, ptr [[LSR_IV1]], i32 4
; CHECK-NEXT: br label [[ANOTHER_BRANCH]]
; CHECK: another.branch:
; CHECK-NEXT: [[LSR_FOLD_TERM_COND_REPLACED_TERM_COND:%.*]] = icmp eq ptr [[UGLYGEP2]], [[SCEVGEP]]
; CHECK-NEXT: br i1 [[LSR_FOLD_TERM_COND_REPLACED_TERM_COND]], label [[FOR_END:%.*]], label [[FOR_BODY]]
; CHECK: for.end:
; CHECK-NEXT: ret void
;
entry:
%uglygep = getelementptr i8, ptr %a, i32 84
br label %for.body
for.body: ; preds = %another.branch, %entry
%lsr.iv1 = phi ptr [ %uglygep2, %another.branch ], [ %uglygep, %entry ]
%lsr.iv = phi i32 [ %lsr.iv.next, %another.branch ], [ 379, %entry ]
store i32 1, ptr %lsr.iv1, align 4
%lsr.iv.next = add nsw i32 %lsr.iv, -1
%uglygep2 = getelementptr i8, ptr %lsr.iv1, i32 4
br label %another.branch
another.branch:
%exitcond.not = icmp sgt i32 %lsr.iv.next, 0
br i1 %exitcond.not, label %for.body, label %for.end
for.end: ; preds = %for.body
ret void
}
; Invert branch in SeveralLoopLatch
define void @SeveralLoopLatch2(ptr %a) {
; CHECK-LABEL: @SeveralLoopLatch2(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[UGLYGEP:%.*]] = getelementptr i8, ptr [[A:%.*]], i32 84
; CHECK-NEXT: [[SCEVGEP:%.*]] = getelementptr i8, ptr [[A]], i64 1600
; CHECK-NEXT: br label [[FOR_BODY:%.*]]
; CHECK: for.body:
; CHECK-NEXT: [[LSR_IV1:%.*]] = phi ptr [ [[UGLYGEP2:%.*]], [[ANOTHER_BRANCH:%.*]] ], [ [[UGLYGEP]], [[ENTRY:%.*]] ]
; CHECK-NEXT: store i32 1, ptr [[LSR_IV1]], align 4
; CHECK-NEXT: [[UGLYGEP2]] = getelementptr i8, ptr [[LSR_IV1]], i32 4
; CHECK-NEXT: br label [[ANOTHER_BRANCH]]
; CHECK: another.branch:
; CHECK-NEXT: [[LSR_FOLD_TERM_COND_REPLACED_TERM_COND:%.*]] = icmp eq ptr [[UGLYGEP2]], [[SCEVGEP]]
; CHECK-NEXT: br i1 [[LSR_FOLD_TERM_COND_REPLACED_TERM_COND]], label [[FOR_END:%.*]], label [[FOR_BODY]]
; CHECK: for.end:
; CHECK-NEXT: ret void
;
entry:
%uglygep = getelementptr i8, ptr %a, i32 84
br label %for.body
for.body: ; preds = %another.branch, %entry
%lsr.iv1 = phi ptr [ %uglygep2, %another.branch ], [ %uglygep, %entry ]
%lsr.iv = phi i32 [ %lsr.iv.next, %another.branch ], [ 379, %entry ]
store i32 1, ptr %lsr.iv1, align 4
%lsr.iv.next = add nsw i32 %lsr.iv, -1
%uglygep2 = getelementptr i8, ptr %lsr.iv1, i32 4
br label %another.branch
another.branch:
%exitcond.not = icmp sle i32 %lsr.iv.next, 0
br i1 %exitcond.not, label %for.end, label %for.body
for.end: ; preds = %for.body
ret void
}