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Add a new pass "inductive range check elimination"

Browse Source 
IRCE eliminates range checks of the form

  0 <= A * I + B < Length

by splitting a loop's iteration space into three segments in a way
that the check is completely redundant in the middle segment.  As an
example, IRCE will convert

  len = < known positive >
  for (i = 0; i < n; i++) {
    if (0 <= i && i < len) {
      do_something();
    } else {
      throw_out_of_bounds();
    }
  }

to

  len = < known positive >
  limit = smin(n, len)
  // no first segment
  for (i = 0; i < limit; i++) {
    if (0 <= i && i < len) { // this check is fully redundant
      do_something();
    } else {
      throw_out_of_bounds();
    }
  }
  for (i = limit; i < n; i++) {
    if (0 <= i && i < len) {
      do_something();
    } else {
      throw_out_of_bounds();
    }
  }


IRCE can deal with multiple range checks in the same loop (it takes
the intersection of the ranges that will make each of them redundant
individually).

Currently IRCE does not do any profitability analysis.  That is a
TODO.

Please note that the status of this pass is *experimental*, and it is
not part of any default pass pipeline.  Having said that, I will love
to get feedback and general input from people interested in trying
this out.

This pass was originally r226201.  It was reverted because it used C++
features not supported by MSVC 2012.

Differential Revision: http://reviews.llvm.org/D6693

llvm-svn: 226238
This commit is contained in:
Sanjoy Das 2015-01-16 01:03:22 +00:00
parent c79090cb32
commit 8ce28789d0
11 changed files with 1830 additions and 0 deletions
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1
include/llvm/InitializePasses.h
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@ -142,6 +142,7 @@ void initializeIPCPPass(PassRegistry&);
void initializeIPSCCPPass(PassRegistry&);
void initializeIVUsersPass(PassRegistry&);
void initializeIfConverterPass(PassRegistry&);
void initializeInductiveRangeCheckEliminationPass(PassRegistry&);
void initializeIndVarSimplifyPass(PassRegistry&);
void initializeInlineCostAnalysisPass(PassRegistry&);
void initializeInstCombinerPass(PassRegistry&);

1
include/llvm/LinkAllPasses.h
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@ -86,6 +86,7 @@ namespace {
(void) llvm::createGlobalsModRefPass();
(void) llvm::createIPConstantPropagationPass();
(void) llvm::createIPSCCPPass();
(void) llvm::createInductiveRangeCheckEliminationPass();
(void) llvm::createIndVarSimplifyPass();
(void) llvm::createInstructionCombiningPass();
(void) llvm::createInternalizePass();

7
include/llvm/Transforms/Scalar.h
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@ -96,6 +96,13 @@ FunctionPass *createScalarReplAggregatesPass(signed Threshold = -1,
signed ArrayElementThreshold = -1,
signed ScalarLoadThreshold = -1);
//===----------------------------------------------------------------------===//
//
// InductiveRangeCheckElimination - Transform loops to elide range checks on
// linear functions of the induction variable.
//
Pass *createInductiveRangeCheckEliminationPass();
//===----------------------------------------------------------------------===//
//
// InductionVariableSimplify - Transform induction variables in a program to all

1
lib/Transforms/Scalar/CMakeLists.txt
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@ -9,6 +9,7 @@ add_llvm_library(LLVMScalarOpts
EarlyCSE.cpp
FlattenCFGPass.cpp
GVN.cpp
InductiveRangeCheckElimination.cpp
IndVarSimplify.cpp
JumpThreading.cpp
LICM.cpp

1210
lib/Transforms/Scalar/InductiveRangeCheckElimination.cpp Normal file
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File diff suppressed because it is too large Load Diff

1
lib/Transforms/Scalar/Scalar.cpp
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@ -40,6 +40,7 @@ void llvm::initializeScalarOpts(PassRegistry &Registry) {
initializeGVNPass(Registry);
initializeEarlyCSEPass(Registry);
initializeFlattenCFGPassPass(Registry);
initializeInductiveRangeCheckEliminationPass(Registry);
initializeIndVarSimplifyPass(Registry);
initializeJumpThreadingPass(Registry);
initializeLICMPass(Registry);

59
test/Transforms/IRCE/multiple-access-no-preloop.ll Normal file
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@ -0,0 +1,59 @@
; RUN: opt -irce -S < %s | FileCheck %s
define void @multiple_access_no_preloop(
i32* %arr_a, i32* %a_len_ptr, i32* %arr_b, i32* %b_len_ptr, i32 %n) {
entry:
%len.a = load i32* %a_len_ptr, !range !0
%len.b = load i32* %b_len_ptr, !range !0
%first.itr.check = icmp sgt i32 %n, 0
br i1 %first.itr.check, label %loop, label %exit
loop:
%idx = phi i32 [ 0, %entry ] , [ %idx.next, %in.bounds.b ]
%idx.next = add i32 %idx, 1
%abc.a = icmp slt i32 %idx, %len.a
br i1 %abc.a, label %in.bounds.a, label %out.of.bounds
in.bounds.a:
%addr.a = getelementptr i32* %arr_a, i32 %idx
store i32 0, i32* %addr.a
%abc.b = icmp slt i32 %idx, %len.b
br i1 %abc.b, label %in.bounds.b, label %out.of.bounds
in.bounds.b:
%addr.b = getelementptr i32* %arr_b, i32 %idx
store i32 -1, i32* %addr.b
%next = icmp slt i32 %idx.next, %n
br i1 %next, label %loop, label %exit
out.of.bounds:
ret void
exit:
ret void
}
; CHECK-LABEL: multiple_access_no_preloop
; CHECK-LABEL: loop.preheader:
; CHECK: [[smaller_len_cmp:[^ ]+]] = icmp slt i32 %len.a, %len.b
; CHECK: [[smaller_len:[^ ]+]] = select i1 [[smaller_len_cmp]], i32 %len.a, i32 %len.b
; CHECK: [[upper_bound_cmp:[^ ]+]] = icmp slt i32 %n, %3
; CHECK: [[upper_bound:[^ ]+]] = select i1 %5, i32 %n, i32 %3
; CHECK-LABEL: loop:
; CHECK: br i1 true, label %in.bounds.a, label %out.of.bounds
; CHECK-LABEL: in.bounds.a:
; CHECK: br i1 true, label %in.bounds.b, label %out.of.bounds
; CHECK-LABEL: in.bounds.b:
; CHECK: [[main_loop_cond:[^ ]+]] = icmp slt i32 %idx.next, [[upper_bound]]
; CHECK: br i1 [[main_loop_cond]], label %loop, label %main.exit.selector
; CHECK-LABEL: in.bounds.b.postloop:
; CHECK: %next.postloop = icmp slt i32 %idx.next.postloop, %n
; CHECK: br i1 %next.postloop, label %loop.postloop, label %exit.loopexit
!0 = !{i32 0, i32 2147483647}

110
test/Transforms/IRCE/single-access-no-preloop.ll Normal file
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@ -0,0 +1,110 @@
; RUN: opt -irce -S < %s | FileCheck %s
define void @single_access_no_preloop_no_offset(i32 *%arr, i32 *%a_len_ptr, i32 %n) {
entry:
%len = load i32* %a_len_ptr, !range !0
%first.itr.check = icmp sgt i32 %n, 0
br i1 %first.itr.check, label %loop, label %exit
loop:
%idx = phi i32 [ 0, %entry ] , [ %idx.next, %in.bounds ]
%idx.next = add i32 %idx, 1
%abc = icmp slt i32 %idx, %len
br i1 %abc, label %in.bounds, label %out.of.bounds
in.bounds:
%addr = getelementptr i32* %arr, i32 %idx
store i32 0, i32* %addr
%next = icmp slt i32 %idx.next, %n
br i1 %next, label %loop, label %exit
out.of.bounds:
ret void
exit:
ret void
}
; CHECK-LABEL: single_access_no_preloop
; CHECK-LABEL: loop:
; CHECK: br i1 true, label %in.bounds, label %out.of.bounds
; CHECK-LABEL: main.exit.selector:
; CHECK-NEXT: [[continue:%[^ ]+]] = icmp slt i32 %idx.next, %n
; CHECK-NEXT: br i1 [[continue]], label %main.pseudo.exit, label %exit.loopexit
; CHECK-LABEL: main.pseudo.exit:
; CHECK-NEXT: %idx.copy = phi i32 [ 0, %loop.preheader ], [ %idx.next, %main.exit.selector ]
; CHECK-NEXT: br label %postloop
; CHECK-LABEL: postloop:
; CHECK-NEXT: br label %loop.postloop
; CHECK-LABEL: loop.postloop:
; CHECK-NEXT: %idx.postloop = phi i32 [ %idx.next.postloop, %in.bounds.postloop ], [ %idx.copy, %postloop ]
; CHECK-NEXT: %idx.next.postloop = add i32 %idx.postloop, 1
; CHECK-NEXT: %abc.postloop = icmp slt i32 %idx.postloop, %len
; CHECK-NEXT: br i1 %abc.postloop, label %in.bounds.postloop, label %out.of.bounds
; CHECK-LABEL: in.bounds.postloop:
; CHECK-NEXT: %addr.postloop = getelementptr i32* %arr, i32 %idx.postloop
; CHECK-NEXT: store i32 0, i32* %addr.postloop
; CHECK-NEXT: %next.postloop = icmp slt i32 %idx.next.postloop, %n
; CHECK-NEXT: br i1 %next.postloop, label %loop.postloop, label %exit.loopexit
define void @single_access_no_preloop_with_offset(i32 *%arr, i32 *%a_len_ptr, i32 %n) {
entry:
%len = load i32* %a_len_ptr, !range !0
%first.itr.check = icmp sgt i32 %n, 0
br i1 %first.itr.check, label %loop, label %exit
loop:
%idx = phi i32 [ 0, %entry ] , [ %idx.next, %in.bounds ]
%idx.next = add i32 %idx, 1
%idx.for.abc = add i32 %idx, 4
%abc = icmp slt i32 %idx.for.abc, %len
br i1 %abc, label %in.bounds, label %out.of.bounds
in.bounds:
%addr = getelementptr i32* %arr, i32 %idx.for.abc
store i32 0, i32* %addr
%next = icmp slt i32 %idx.next, %n
br i1 %next, label %loop, label %exit
out.of.bounds:
ret void
exit:
ret void
}
; CHECK-LABEL: single_access_no_preloop_with_offset
; CHECK-LABEL: loop.preheader:
; CHECK: [[safe_range_end:[^ ]+]] = sub i32 %len, 4
; CHECK: [[exit_main_loop_at_cmp:[^ ]+]] = icmp slt i32 %n, [[safe_range_end]]
; CHECK: [[exit_main_loop_at:[^ ]+]] = select i1 [[exit_main_loop_at_cmp]], i32 %n, i32 [[safe_range_end]]
; CHECK: [[enter_main_loop:[^ ]+]] = icmp slt i32 0, [[exit_main_loop_at]]
; CHECK: br i1 [[enter_main_loop]], label %loop, label %main.pseudo.exit
; CHECK-LABEL: loop:
; CHECK: br i1 true, label %in.bounds, label %out.of.bounds
; CHECK-LABEL: in.bounds:
; CHECK: [[continue_main_loop:[^ ]+]] = icmp slt i32 %idx.next, [[exit_main_loop_at]]
; CHECK: br i1 [[continue_main_loop]], label %loop, label %main.exit.selector
; CHECK-LABEL: main.pseudo.exit:
; CHECK: %idx.copy = phi i32 [ 0, %loop.preheader ], [ %idx.next, %main.exit.selector ]
; CHECK: br label %postloop
; CHECK-LABEL: loop.postloop:
; CHECK: %idx.postloop = phi i32 [ %idx.next.postloop, %in.bounds.postloop ], [ %idx.copy, %postloop ]
; CHECK-LABEL: in.bounds.postloop:
; CHECK: %next.postloop = icmp slt i32 %idx.next.postloop, %n
; CHECK: br i1 %next.postloop, label %loop.postloop, label %exit.loopexit
!0 = !{i32 0, i32 2147483647}

59
test/Transforms/IRCE/single-access-with-preloop.ll Normal file
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@ -0,0 +1,59 @@
; RUN: opt -irce -S < %s | FileCheck %s
define void @single_access_with_preloop(i32 *%arr, i32 *%a_len_ptr, i32 %n, i32 %offset) {
entry:
%len = load i32* %a_len_ptr, !range !0
%first.itr.check = icmp sgt i32 %n, 0
br i1 %first.itr.check, label %loop, label %exit
loop:
%idx = phi i32 [ 0, %entry ] , [ %idx.next, %in.bounds ]
%idx.next = add i32 %idx, 1
%array.idx = add i32 %idx, %offset
%abc.high = icmp slt i32 %array.idx, %len
%abc.low = icmp sge i32 %array.idx, 0
%abc = and i1 %abc.low, %abc.high
br i1 %abc, label %in.bounds, label %out.of.bounds
in.bounds:
%addr = getelementptr i32* %arr, i32 %array.idx
store i32 0, i32* %addr
%next = icmp slt i32 %idx.next, %n
br i1 %next, label %loop, label %exit
out.of.bounds:
ret void
exit:
ret void
}
; CHECK-LABEL: loop.preheader:
; CHECK: [[safe_start:[^ ]+]] = sub i32 0, %offset
; CHECK: [[safe_end:[^ ]+]] = sub i32 %len, %offset
; CHECK: [[exit_preloop_at_cond:[^ ]+]] = icmp slt i32 %n, [[safe_start]]
; CHECK: [[exit_preloop_at:[^ ]+]] = select i1 [[exit_preloop_at_cond]], i32 %n, i32 [[safe_start]]
; CHECK: [[exit_mainloop_at_cond:[^ ]+]] = icmp slt i32 %n, [[safe_end]]
; CHECK: [[exit_mainloop_at:[^ ]+]] = select i1 [[exit_mainloop_at_cond]], i32 %n, i32 [[safe_end]]
; CHECK-LABEL: in.bounds:
; CHECK: [[continue_mainloop_cond:[^ ]+]] = icmp slt i32 %idx.next, [[exit_mainloop_at]]
; CHECK: br i1 [[continue_mainloop_cond]], label %loop, label %main.exit.selector
; CHECK-LABEL: main.exit.selector:
; CHECK: [[mainloop_its_left:[^ ]+]] = icmp slt i32 %idx.next, %n
; CHECK: br i1 [[mainloop_its_left]], label %main.pseudo.exit, label %exit.loopexit
; CHECK-LABEL: in.bounds.preloop:
; CHECK: [[continue_preloop_cond:[^ ]+]] = icmp slt i32 %idx.next.preloop, [[exit_preloop_at]]
; CHECK: br i1 [[continue_preloop_cond]], label %loop.preloop, label %preloop.exit.selector
; CHECK-LABEL: preloop.exit.selector:
; CHECK: [[preloop_its_left:[^ ]+]] = icmp slt i32 %idx.next.preloop, %n
; CHECK: br i1 [[preloop_its_left]], label %preloop.pseudo.exit, label %exit.loopexit
; CHECK-LABEL: in.bounds.postloop:
; CHECK: %next.postloop = icmp slt i32 %idx.next.postloop, %n
; CHECK: br i1 %next.postloop, label %loop.postloop, label %exit.loopexit
!0 = !{i32 0, i32 2147483647}

37
test/Transforms/IRCE/unhandled.ll Normal file
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@ -0,0 +1,37 @@
; RUN: opt -irce-print-changed-loops -irce -S < %s 2>&1 | FileCheck %s
; Demonstrates that we don't currently handle the general expression
; `A * I + B'.
define void @general_affine_expressions(i32 *%arr, i32 *%a_len_ptr, i32 %n,
i32 %scale, i32 %offset) {
; CHECK-NOT: constrained Loop at depth
entry:
%len = load i32* %a_len_ptr, !range !0
%first.itr.check = icmp sgt i32 %n, 0
br i1 %first.itr.check, label %loop, label %exit
loop:
%idx = phi i32 [ 0, %entry ] , [ %idx.next, %in.bounds ]
%idx.next = add i32 %idx, 1
%idx.mul = mul i32 %idx, %scale
%array.idx = add i32 %idx.mul, %offset
%abc.high = icmp slt i32 %array.idx, %len
%abc.low = icmp sge i32 %array.idx, 0
%abc = and i1 %abc.low, %abc.high
br i1 %abc, label %in.bounds, label %out.of.bounds
in.bounds:
%addr = getelementptr i32* %arr, i32 %array.idx
store i32 0, i32* %addr
%next = icmp slt i32 %idx.next, %n
br i1 %next, label %loop, label %exit
out.of.bounds:
ret void
exit:
ret void
}
!0 = !{i32 0, i32 2147483647}

344
test/Transforms/IRCE/with-parent-loops.ll Normal file
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@ -0,0 +1,344 @@
; RUN: opt -verify-loop-info -irce-print-changed-loops -irce < %s 2>&1 | FileCheck %s
; This test checks if we update the LoopInfo correctly in the presence
; of parents, uncles and cousins.
; Function Attrs: alwaysinline
define void @inner_loop(i32* %arr, i32* %a_len_ptr, i32 %n) #0 {
; CHECK: irce: in function inner_loop: constrained Loop at depth 1 containing: %loop<header><exiting>,%in.bounds<latch><exiting>
entry:
%len = load i32* %a_len_ptr, !range !0
%first.itr.check = icmp sgt i32 %n, 0
br i1 %first.itr.check, label %loop, label %exit
loop: ; preds = %in.bounds, %entry
%idx = phi i32 [ 0, %entry ], [ %idx.next, %in.bounds ]
%idx.next = add i32 %idx, 1
%abc = icmp slt i32 %idx, %len
br i1 %abc, label %in.bounds, label %out.of.bounds
in.bounds: ; preds = %loop
%addr = getelementptr i32* %arr, i32 %idx
store i32 0, i32* %addr
%next = icmp slt i32 %idx.next, %n
br i1 %next, label %loop, label %exit
out.of.bounds: ; preds = %loop
ret void
exit: ; preds = %in.bounds, %entry
ret void
}
; Function Attrs: alwaysinline
define void @with_parent(i32* %arr, i32* %a_len_ptr, i32 %n, i32 %parent.count) #0 {
; CHECK: irce: in function with_parent: constrained Loop at depth 2 containing: %loop.i<header><exiting>,%in.bounds.i<latch><exiting>
entry:
br label %loop
loop: ; preds = %inner_loop.exit, %entry
%idx = phi i32 [ 0, %entry ], [ %idx.next, %inner_loop.exit ]
%idx.next = add i32 %idx, 1
%next = icmp ult i32 %idx.next, %parent.count
%len.i = load i32* %a_len_ptr, !range !0
%first.itr.check.i = icmp sgt i32 %n, 0
br i1 %first.itr.check.i, label %loop.i, label %exit.i
loop.i: ; preds = %in.bounds.i, %loop
%idx.i = phi i32 [ 0, %loop ], [ %idx.next.i, %in.bounds.i ]
%idx.next.i = add i32 %idx.i, 1
%abc.i = icmp slt i32 %idx.i, %len.i
br i1 %abc.i, label %in.bounds.i, label %out.of.bounds.i
in.bounds.i: ; preds = %loop.i
%addr.i = getelementptr i32* %arr, i32 %idx.i
store i32 0, i32* %addr.i
%next.i = icmp slt i32 %idx.next.i, %n
br i1 %next.i, label %loop.i, label %exit.i
out.of.bounds.i: ; preds = %loop.i
br label %inner_loop.exit
exit.i: ; preds = %in.bounds.i, %loop
br label %inner_loop.exit
inner_loop.exit: ; preds = %exit.i, %out.of.bounds.i
br i1 %next, label %loop, label %exit
exit: ; preds = %inner_loop.exit
ret void
}
; Function Attrs: alwaysinline
define void @with_grandparent(i32* %arr, i32* %a_len_ptr, i32 %n, i32 %parent.count, i32 %grandparent.count) #0 {
; CHECK: irce: in function with_grandparent: constrained Loop at depth 3 containing: %loop.i.i<header><exiting>,%in.bounds.i.i<latch><exiting>
entry:
br label %loop
loop: ; preds = %with_parent.exit, %entry
%idx = phi i32 [ 0, %entry ], [ %idx.next, %with_parent.exit ]
%idx.next = add i32 %idx, 1
%next = icmp ult i32 %idx.next, %grandparent.count
br label %loop.i
loop.i: ; preds = %inner_loop.exit.i, %loop
%idx.i = phi i32 [ 0, %loop ], [ %idx.next.i, %inner_loop.exit.i ]
%idx.next.i = add i32 %idx.i, 1
%next.i = icmp ult i32 %idx.next.i, %parent.count
%len.i.i = load i32* %a_len_ptr, !range !0
%first.itr.check.i.i = icmp sgt i32 %n, 0
br i1 %first.itr.check.i.i, label %loop.i.i, label %exit.i.i
loop.i.i: ; preds = %in.bounds.i.i, %loop.i
%idx.i.i = phi i32 [ 0, %loop.i ], [ %idx.next.i.i, %in.bounds.i.i ]
%idx.next.i.i = add i32 %idx.i.i, 1
%abc.i.i = icmp slt i32 %idx.i.i, %len.i.i
br i1 %abc.i.i, label %in.bounds.i.i, label %out.of.bounds.i.i
in.bounds.i.i: ; preds = %loop.i.i
%addr.i.i = getelementptr i32* %arr, i32 %idx.i.i
store i32 0, i32* %addr.i.i
%next.i.i = icmp slt i32 %idx.next.i.i, %n
br i1 %next.i.i, label %loop.i.i, label %exit.i.i
out.of.bounds.i.i: ; preds = %loop.i.i
br label %inner_loop.exit.i
exit.i.i: ; preds = %in.bounds.i.i, %loop.i
br label %inner_loop.exit.i
inner_loop.exit.i: ; preds = %exit.i.i, %out.of.bounds.i.i
br i1 %next.i, label %loop.i, label %with_parent.exit
with_parent.exit: ; preds = %inner_loop.exit.i
br i1 %next, label %loop, label %exit
exit: ; preds = %with_parent.exit
ret void
}
; Function Attrs: alwaysinline
define void @with_sibling(i32* %arr, i32* %a_len_ptr, i32 %n, i32 %parent.count) #0 {
; CHECK: irce: in function with_sibling: constrained Loop at depth 2 containing: %loop.i<header><exiting>,%in.bounds.i<latch><exiting>
; CHECK: irce: in function with_sibling: constrained Loop at depth 2 containing: %loop.i6<header><exiting>,%in.bounds.i9<latch><exiting>
entry:
br label %loop
loop: ; preds = %inner_loop.exit12, %entry
%idx = phi i32 [ 0, %entry ], [ %idx.next, %inner_loop.exit12 ]
%idx.next = add i32 %idx, 1
%next = icmp ult i32 %idx.next, %parent.count
%len.i = load i32* %a_len_ptr, !range !0
%first.itr.check.i = icmp sgt i32 %n, 0
br i1 %first.itr.check.i, label %loop.i, label %exit.i
loop.i: ; preds = %in.bounds.i, %loop
%idx.i = phi i32 [ 0, %loop ], [ %idx.next.i, %in.bounds.i ]
%idx.next.i = add i32 %idx.i, 1
%abc.i = icmp slt i32 %idx.i, %len.i
br i1 %abc.i, label %in.bounds.i, label %out.of.bounds.i
in.bounds.i: ; preds = %loop.i
%addr.i = getelementptr i32* %arr, i32 %idx.i
store i32 0, i32* %addr.i
%next.i = icmp slt i32 %idx.next.i, %n
br i1 %next.i, label %loop.i, label %exit.i
out.of.bounds.i: ; preds = %loop.i
br label %inner_loop.exit
exit.i: ; preds = %in.bounds.i, %loop
br label %inner_loop.exit
inner_loop.exit: ; preds = %exit.i, %out.of.bounds.i
%len.i1 = load i32* %a_len_ptr, !range !0
%first.itr.check.i2 = icmp sgt i32 %n, 0
br i1 %first.itr.check.i2, label %loop.i6, label %exit.i11
loop.i6: ; preds = %in.bounds.i9, %inner_loop.exit
%idx.i3 = phi i32 [ 0, %inner_loop.exit ], [ %idx.next.i4, %in.bounds.i9 ]
%idx.next.i4 = add i32 %idx.i3, 1
%abc.i5 = icmp slt i32 %idx.i3, %len.i1
br i1 %abc.i5, label %in.bounds.i9, label %out.of.bounds.i10
in.bounds.i9: ; preds = %loop.i6
%addr.i7 = getelementptr i32* %arr, i32 %idx.i3
store i32 0, i32* %addr.i7
%next.i8 = icmp slt i32 %idx.next.i4, %n
br i1 %next.i8, label %loop.i6, label %exit.i11
out.of.bounds.i10: ; preds = %loop.i6
br label %inner_loop.exit12
exit.i11: ; preds = %in.bounds.i9, %inner_loop.exit
br label %inner_loop.exit12
inner_loop.exit12: ; preds = %exit.i11, %out.of.bounds.i10
br i1 %next, label %loop, label %exit
exit: ; preds = %inner_loop.exit12
ret void
}
; Function Attrs: alwaysinline
define void @with_cousin(i32* %arr, i32* %a_len_ptr, i32 %n, i32 %parent.count, i32 %grandparent.count) #0 {
; CHECK: irce: in function with_cousin: constrained Loop at depth 3 containing: %loop.i.i<header><exiting>,%in.bounds.i.i<latch><exiting>
; CHECK: irce: in function with_cousin: constrained Loop at depth 3 containing: %loop.i.i10<header><exiting>,%in.bounds.i.i13<latch><exiting>
entry:
br label %loop
loop: ; preds = %with_parent.exit17, %entry
%idx = phi i32 [ 0, %entry ], [ %idx.next, %with_parent.exit17 ]
%idx.next = add i32 %idx, 1
%next = icmp ult i32 %idx.next, %grandparent.count
br label %loop.i
loop.i: ; preds = %inner_loop.exit.i, %loop
%idx.i = phi i32 [ 0, %loop ], [ %idx.next.i, %inner_loop.exit.i ]
%idx.next.i = add i32 %idx.i, 1
%next.i = icmp ult i32 %idx.next.i, %parent.count
%len.i.i = load i32* %a_len_ptr, !range !0
%first.itr.check.i.i = icmp sgt i32 %n, 0
br i1 %first.itr.check.i.i, label %loop.i.i, label %exit.i.i
loop.i.i: ; preds = %in.bounds.i.i, %loop.i
%idx.i.i = phi i32 [ 0, %loop.i ], [ %idx.next.i.i, %in.bounds.i.i ]
%idx.next.i.i = add i32 %idx.i.i, 1
%abc.i.i = icmp slt i32 %idx.i.i, %len.i.i
br i1 %abc.i.i, label %in.bounds.i.i, label %out.of.bounds.i.i
in.bounds.i.i: ; preds = %loop.i.i
%addr.i.i = getelementptr i32* %arr, i32 %idx.i.i
store i32 0, i32* %addr.i.i
%next.i.i = icmp slt i32 %idx.next.i.i, %n
br i1 %next.i.i, label %loop.i.i, label %exit.i.i
out.of.bounds.i.i: ; preds = %loop.i.i
br label %inner_loop.exit.i
exit.i.i: ; preds = %in.bounds.i.i, %loop.i
br label %inner_loop.exit.i
inner_loop.exit.i: ; preds = %exit.i.i, %out.of.bounds.i.i
br i1 %next.i, label %loop.i, label %with_parent.exit
with_parent.exit: ; preds = %inner_loop.exit.i
br label %loop.i6
loop.i6: ; preds = %inner_loop.exit.i16, %with_parent.exit
%idx.i1 = phi i32 [ 0, %with_parent.exit ], [ %idx.next.i2, %inner_loop.exit.i16 ]
%idx.next.i2 = add i32 %idx.i1, 1
%next.i3 = icmp ult i32 %idx.next.i2, %parent.count
%len.i.i4 = load i32* %a_len_ptr, !range !0
%first.itr.check.i.i5 = icmp sgt i32 %n, 0
br i1 %first.itr.check.i.i5, label %loop.i.i10, label %exit.i.i15
loop.i.i10: ; preds = %in.bounds.i.i13, %loop.i6
%idx.i.i7 = phi i32 [ 0, %loop.i6 ], [ %idx.next.i.i8, %in.bounds.i.i13 ]
%idx.next.i.i8 = add i32 %idx.i.i7, 1
%abc.i.i9 = icmp slt i32 %idx.i.i7, %len.i.i4
br i1 %abc.i.i9, label %in.bounds.i.i13, label %out.of.bounds.i.i14
in.bounds.i.i13: ; preds = %loop.i.i10
%addr.i.i11 = getelementptr i32* %arr, i32 %idx.i.i7
store i32 0, i32* %addr.i.i11
%next.i.i12 = icmp slt i32 %idx.next.i.i8, %n
br i1 %next.i.i12, label %loop.i.i10, label %exit.i.i15
out.of.bounds.i.i14: ; preds = %loop.i.i10
br label %inner_loop.exit.i16
exit.i.i15: ; preds = %in.bounds.i.i13, %loop.i6
br label %inner_loop.exit.i16
inner_loop.exit.i16: ; preds = %exit.i.i15, %out.of.bounds.i.i14
br i1 %next.i3, label %loop.i6, label %with_parent.exit17
with_parent.exit17: ; preds = %inner_loop.exit.i16
br i1 %next, label %loop, label %exit
exit: ; preds = %with_parent.exit17
ret void
}
; Function Attrs: alwaysinline
define void @with_uncle(i32* %arr, i32* %a_len_ptr, i32 %n, i32 %parent.count, i32 %grandparent.count) #0 {
; CHECK: irce: in function with_uncle: constrained Loop at depth 2 containing: %loop.i<header><exiting>,%in.bounds.i<latch><exiting>
; CHECK: irce: in function with_uncle: constrained Loop at depth 3 containing: %loop.i.i<header><exiting>,%in.bounds.i.i<latch><exiting>
entry:
br label %loop
loop: ; preds = %with_parent.exit, %entry
%idx = phi i32 [ 0, %entry ], [ %idx.next, %with_parent.exit ]
%idx.next = add i32 %idx, 1
%next = icmp ult i32 %idx.next, %grandparent.count
%len.i = load i32* %a_len_ptr, !range !0
%first.itr.check.i = icmp sgt i32 %n, 0
br i1 %first.itr.check.i, label %loop.i, label %exit.i
loop.i: ; preds = %in.bounds.i, %loop
%idx.i = phi i32 [ 0, %loop ], [ %idx.next.i, %in.bounds.i ]
%idx.next.i = add i32 %idx.i, 1
%abc.i = icmp slt i32 %idx.i, %len.i
br i1 %abc.i, label %in.bounds.i, label %out.of.bounds.i
in.bounds.i: ; preds = %loop.i
%addr.i = getelementptr i32* %arr, i32 %idx.i
store i32 0, i32* %addr.i
%next.i = icmp slt i32 %idx.next.i, %n
br i1 %next.i, label %loop.i, label %exit.i
out.of.bounds.i: ; preds = %loop.i
br label %inner_loop.exit
exit.i: ; preds = %in.bounds.i, %loop
br label %inner_loop.exit
inner_loop.exit: ; preds = %exit.i, %out.of.bounds.i
br label %loop.i4
loop.i4: ; preds = %inner_loop.exit.i, %inner_loop.exit
%idx.i1 = phi i32 [ 0, %inner_loop.exit ], [ %idx.next.i2, %inner_loop.exit.i ]
%idx.next.i2 = add i32 %idx.i1, 1
%next.i3 = icmp ult i32 %idx.next.i2, %parent.count
%len.i.i = load i32* %a_len_ptr, !range !0
%first.itr.check.i.i = icmp sgt i32 %n, 0
br i1 %first.itr.check.i.i, label %loop.i.i, label %exit.i.i
loop.i.i: ; preds = %in.bounds.i.i, %loop.i4
%idx.i.i = phi i32 [ 0, %loop.i4 ], [ %idx.next.i.i, %in.bounds.i.i ]
%idx.next.i.i = add i32 %idx.i.i, 1
%abc.i.i = icmp slt i32 %idx.i.i, %len.i.i
br i1 %abc.i.i, label %in.bounds.i.i, label %out.of.bounds.i.i
in.bounds.i.i: ; preds = %loop.i.i
%addr.i.i = getelementptr i32* %arr, i32 %idx.i.i
store i32 0, i32* %addr.i.i
%next.i.i = icmp slt i32 %idx.next.i.i, %n
br i1 %next.i.i, label %loop.i.i, label %exit.i.i
out.of.bounds.i.i: ; preds = %loop.i.i
br label %inner_loop.exit.i
exit.i.i: ; preds = %in.bounds.i.i, %loop.i4
br label %inner_loop.exit.i
inner_loop.exit.i: ; preds = %exit.i.i, %out.of.bounds.i.i
br i1 %next.i3, label %loop.i4, label %with_parent.exit
with_parent.exit: ; preds = %inner_loop.exit.i
br i1 %next, label %loop, label %exit
exit: ; preds = %with_parent.exit
ret void
}
attributes #0 = { alwaysinline }
!0 = !{i32 0, i32 2147483647}