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[LoopPredication] Fix division by zero in case of zero branch weights (#66506)

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Treat the case where all branch weights are zero as if there was no
profile.
Fixes #66382
This commit is contained in:
Danila Malyutin 2023-09-18 18:38:29 -07:00 committed by GitHub
parent d307d20717
commit a668c0f687
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GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 282 additions and 1 deletions
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3
llvm/lib/Transforms/Scalar/LoopPredication.cpp
View File

@ -967,6 +967,9 @@ bool LoopPredication::isLoopProfitableToPredicate() {
Numerator += Weight;
Denominator += Weight;
}
// If all weights are zero act as if there was no profile data
if (Denominator == 0)
return BranchProbability::getBranchProbability(1, NumSucc);
return BranchProbability::getBranchProbability(Numerator, Denominator);
} else {
assert(LatchBlock != ExitingBlock &&

21
llvm/test/Transforms/LoopPredication/pr66382.ll
View File

@ -1,4 +1,4 @@
; XFAIL: *
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 3
; RUN: opt -S -loop-predication-skip-profitability-checks=false -passes='require<scalar-evolution>,loop-mssa(loop-predication)' %s | FileCheck %s
target triple = "x86_64-unknown-linux-gnu"
@ -6,7 +6,26 @@ target triple = "x86_64-unknown-linux-gnu"
; Function Attrs: nocallback nofree nosync willreturn
declare void @llvm.experimental.guard(i1, ...) #0
; Check that LoopPredication doesn't crash on all-zero branch weights
define void @foo() {
; CHECK-LABEL: define void @foo() {
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[HEADER:%.*]]
; CHECK: Header:
; CHECK-NEXT: [[J2:%.*]] = phi i64 [ 0, [[ENTRY:%.*]] ], [ [[J_NEXT:%.*]], [[LATCH:%.*]] ]
; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 false, i32 0) [ "deopt"() ]
; CHECK-NEXT: [[J_NEXT]] = add i64 [[J2]], 1
; CHECK-NEXT: br i1 false, label [[LATCH]], label [[EXIT:%.*]]
; CHECK: Latch:
; CHECK-NEXT: [[SPECULATE_TRIP_COUNT:%.*]] = icmp ult i64 [[J2]], 0
; CHECK-NEXT: br i1 [[SPECULATE_TRIP_COUNT]], label [[HEADER]], label [[COMMON_RET_LOOPEXIT:%.*]], !prof [[PROF0:![0-9]+]]
; CHECK: common.ret.loopexit:
; CHECK-NEXT: br label [[COMMON_RET:%.*]]
; CHECK: common.ret:
; CHECK-NEXT: ret void
; CHECK: exit:
; CHECK-NEXT: br label [[COMMON_RET]]
;
entry:
br label %Header

259
llvm/test/Transforms/LoopPredication/scale.ll Normal file
View File

@ -0,0 +1,259 @@
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 3
; RUN: opt -S -loop-predication-skip-profitability-checks=false -passes='require<scalar-evolution>,loop-mssa(loop-predication)' -verify-memoryssa -loop-predication-latch-probability-scale=2 %s 2>&1 | FileCheck %s --check-prefixes=CHECK-PROF
; RUN: opt -S -loop-predication-skip-profitability-checks=false -passes='require<scalar-evolution>,loop-mssa(loop-predication)' -verify-memoryssa -loop-predication-latch-probability-scale=1.9 %s 2>&1 | FileCheck %s --check-prefixes=CHECK-NOTPROF
; LatchExitProbability: 0x20000000 / 0x80000000 = 25.00%
; ExitingBlockProbability: 0x40000000 / 0x80000000 = 50.00%
; Predicate is profitable when the scale factor is 2 and not profitable if it's less than 2.
define i64 @predicate_eq_ones(ptr nocapture readonly %arg, i32 %length, ptr nocapture readonly %arg2, ptr nocapture readonly %n_addr, i64 %i) !prof !21 {
; CHECK-PROF-LABEL: define i64 @predicate_eq_ones(
; CHECK-PROF-SAME: ptr nocapture readonly [[ARG:%.*]], i32 [[LENGTH:%.*]], ptr nocapture readonly [[ARG2:%.*]], ptr nocapture readonly [[N_ADDR:%.*]], i64 [[I:%.*]]) !prof [[PROF0:![0-9]+]] {
; CHECK-PROF-NEXT: entry:
; CHECK-PROF-NEXT: [[LENGTH_EXT:%.*]] = zext i32 [[LENGTH]] to i64
; CHECK-PROF-NEXT: [[N_PRE:%.*]] = load i64, ptr [[N_ADDR]], align 4
; CHECK-PROF-NEXT: [[TMP0:%.*]] = icmp ule i64 1048576, [[LENGTH_EXT]]
; CHECK-PROF-NEXT: [[TMP1:%.*]] = icmp ult i64 0, [[LENGTH_EXT]]
; CHECK-PROF-NEXT: [[TMP2:%.*]] = and i1 [[TMP1]], [[TMP0]]
; CHECK-PROF-NEXT: [[TMP3:%.*]] = freeze i1 [[TMP2]]
; CHECK-PROF-NEXT: br label [[HEADER:%.*]]
; CHECK-PROF: Header:
; CHECK-PROF-NEXT: [[RESULT_IN3:%.*]] = phi ptr [ [[ARG2]], [[ENTRY:%.*]] ], [ [[ARG]], [[LATCH:%.*]] ]
; CHECK-PROF-NEXT: [[J2:%.*]] = phi i64 [ 0, [[ENTRY]] ], [ [[J_NEXT:%.*]], [[LATCH]] ]
; CHECK-PROF-NEXT: [[WITHIN_BOUNDS:%.*]] = icmp ult i64 [[J2]], [[LENGTH_EXT]]
; CHECK-PROF-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[TMP3]], i32 9) [ "deopt"() ]
; CHECK-PROF-NEXT: call void @llvm.assume(i1 [[WITHIN_BOUNDS]])
; CHECK-PROF-NEXT: [[INNERCMP:%.*]] = icmp eq i64 [[J2]], [[N_PRE]]
; CHECK-PROF-NEXT: [[J_NEXT]] = add nuw nsw i64 [[J2]], 1
; CHECK-PROF-NEXT: br i1 [[INNERCMP]], label [[LATCH]], label [[EXIT:%.*]], !prof [[PROF1:![0-9]+]]
; CHECK-PROF: Latch:
; CHECK-PROF-NEXT: [[SPECULATE_TRIP_COUNT:%.*]] = icmp ult i64 [[J_NEXT]], 1048576
; CHECK-PROF-NEXT: br i1 [[SPECULATE_TRIP_COUNT]], label [[HEADER]], label [[EXITLATCH:%.*]], !prof [[PROF2:![0-9]+]]
; CHECK-PROF: exitLatch:
; CHECK-PROF-NEXT: ret i64 1
; CHECK-PROF: exit:
; CHECK-PROF-NEXT: [[RESULT_IN3_LCSSA:%.*]] = phi ptr [ [[RESULT_IN3]], [[HEADER]] ]
; CHECK-PROF-NEXT: [[RESULT_LE:%.*]] = load i64, ptr [[RESULT_IN3_LCSSA]], align 8
; CHECK-PROF-NEXT: ret i64 [[RESULT_LE]]
;
; CHECK-NOTPROF-LABEL: define i64 @predicate_eq_ones(
; CHECK-NOTPROF-SAME: ptr nocapture readonly [[ARG:%.*]], i32 [[LENGTH:%.*]], ptr nocapture readonly [[ARG2:%.*]], ptr nocapture readonly [[N_ADDR:%.*]], i64 [[I:%.*]]) !prof [[PROF0:![0-9]+]] {
; CHECK-NOTPROF-NEXT: entry:
; CHECK-NOTPROF-NEXT: [[LENGTH_EXT:%.*]] = zext i32 [[LENGTH]] to i64
; CHECK-NOTPROF-NEXT: [[N_PRE:%.*]] = load i64, ptr [[N_ADDR]], align 4
; CHECK-NOTPROF-NEXT: br label [[HEADER:%.*]]
; CHECK-NOTPROF: Header:
; CHECK-NOTPROF-NEXT: [[RESULT_IN3:%.*]] = phi ptr [ [[ARG2]], [[ENTRY:%.*]] ], [ [[ARG]], [[LATCH:%.*]] ]
; CHECK-NOTPROF-NEXT: [[J2:%.*]] = phi i64 [ 0, [[ENTRY]] ], [ [[J_NEXT:%.*]], [[LATCH]] ]
; CHECK-NOTPROF-NEXT: [[WITHIN_BOUNDS:%.*]] = icmp ult i64 [[J2]], [[LENGTH_EXT]]
; CHECK-NOTPROF-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[WITHIN_BOUNDS]], i32 9) [ "deopt"() ]
; CHECK-NOTPROF-NEXT: [[INNERCMP:%.*]] = icmp eq i64 [[J2]], [[N_PRE]]
; CHECK-NOTPROF-NEXT: [[J_NEXT]] = add nuw nsw i64 [[J2]], 1
; CHECK-NOTPROF-NEXT: br i1 [[INNERCMP]], label [[LATCH]], label [[EXIT:%.*]], !prof [[PROF1:![0-9]+]]
; CHECK-NOTPROF: Latch:
; CHECK-NOTPROF-NEXT: [[SPECULATE_TRIP_COUNT:%.*]] = icmp ult i64 [[J_NEXT]], 1048576
; CHECK-NOTPROF-NEXT: br i1 [[SPECULATE_TRIP_COUNT]], label [[HEADER]], label [[EXITLATCH:%.*]], !prof [[PROF2:![0-9]+]]
; CHECK-NOTPROF: exitLatch:
; CHECK-NOTPROF-NEXT: ret i64 1
; CHECK-NOTPROF: exit:
; CHECK-NOTPROF-NEXT: [[RESULT_IN3_LCSSA:%.*]] = phi ptr [ [[RESULT_IN3]], [[HEADER]] ]
; CHECK-NOTPROF-NEXT: [[RESULT_LE:%.*]] = load i64, ptr [[RESULT_IN3_LCSSA]], align 8
; CHECK-NOTPROF-NEXT: ret i64 [[RESULT_LE]]
;
entry:
%length.ext = zext i32 %length to i64
%n.pre = load i64, ptr %n_addr, align 4
br label %Header
Header: ; preds = %entry, %Latch
%result.in3 = phi ptr [ %arg2, %entry ], [ %arg, %Latch ]
%j2 = phi i64 [ 0, %entry ], [ %j.next, %Latch ]
%within.bounds = icmp ult i64 %j2, %length.ext
call void (i1, ...) @llvm.experimental.guard(i1 %within.bounds, i32 9) [ "deopt"() ]
%innercmp = icmp eq i64 %j2, %n.pre
%j.next = add nuw nsw i64 %j2, 1
br i1 %innercmp, label %Latch, label %exit, !prof !0
Latch: ; preds = %Header
%speculate_trip_count = icmp ult i64 %j.next, 1048576
br i1 %speculate_trip_count, label %Header, label %exitLatch, !prof !2
exitLatch: ; preds = %Latch
ret i64 1
exit: ; preds = %Header
%result.in3.lcssa = phi ptr [ %result.in3, %Header ]
%result.le = load i64, ptr %result.in3.lcssa, align 8
ret i64 %result.le
}
!0 = !{!"branch_weights", i32 1, i32 1}
; Same as the previous one, but with zero weights (should be treated as if no profile - equal probability)
define i64 @predicate_eq_zeroes(ptr nocapture readonly %arg, i32 %length, ptr nocapture readonly %arg2, ptr nocapture readonly %n_addr, i64 %i) !prof !21 {
; CHECK-PROF-LABEL: define i64 @predicate_eq_zeroes(
; CHECK-PROF-SAME: ptr nocapture readonly [[ARG:%.*]], i32 [[LENGTH:%.*]], ptr nocapture readonly [[ARG2:%.*]], ptr nocapture readonly [[N_ADDR:%.*]], i64 [[I:%.*]]) !prof [[PROF0]] {
; CHECK-PROF-NEXT: entry:
; CHECK-PROF-NEXT: [[LENGTH_EXT:%.*]] = zext i32 [[LENGTH]] to i64
; CHECK-PROF-NEXT: [[N_PRE:%.*]] = load i64, ptr [[N_ADDR]], align 4
; CHECK-PROF-NEXT: [[TMP0:%.*]] = icmp ule i64 1048576, [[LENGTH_EXT]]
; CHECK-PROF-NEXT: [[TMP1:%.*]] = icmp ult i64 0, [[LENGTH_EXT]]
; CHECK-PROF-NEXT: [[TMP2:%.*]] = and i1 [[TMP1]], [[TMP0]]
; CHECK-PROF-NEXT: [[TMP3:%.*]] = freeze i1 [[TMP2]]
; CHECK-PROF-NEXT: br label [[HEADER:%.*]]
; CHECK-PROF: Header:
; CHECK-PROF-NEXT: [[RESULT_IN3:%.*]] = phi ptr [ [[ARG2]], [[ENTRY:%.*]] ], [ [[ARG]], [[LATCH:%.*]] ]
; CHECK-PROF-NEXT: [[J2:%.*]] = phi i64 [ 0, [[ENTRY]] ], [ [[J_NEXT:%.*]], [[LATCH]] ]
; CHECK-PROF-NEXT: [[WITHIN_BOUNDS:%.*]] = icmp ult i64 [[J2]], [[LENGTH_EXT]]
; CHECK-PROF-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[TMP3]], i32 9) [ "deopt"() ]
; CHECK-PROF-NEXT: call void @llvm.assume(i1 [[WITHIN_BOUNDS]])
; CHECK-PROF-NEXT: [[INNERCMP:%.*]] = icmp eq i64 [[J2]], [[N_PRE]]
; CHECK-PROF-NEXT: [[J_NEXT]] = add nuw nsw i64 [[J2]], 1
; CHECK-PROF-NEXT: br i1 [[INNERCMP]], label [[LATCH]], label [[EXIT:%.*]], !prof [[PROF3:![0-9]+]]
; CHECK-PROF: Latch:
; CHECK-PROF-NEXT: [[SPECULATE_TRIP_COUNT:%.*]] = icmp ult i64 [[J_NEXT]], 1048576
; CHECK-PROF-NEXT: br i1 [[SPECULATE_TRIP_COUNT]], label [[HEADER]], label [[EXITLATCH:%.*]], !prof [[PROF2]]
; CHECK-PROF: exitLatch:
; CHECK-PROF-NEXT: ret i64 1
; CHECK-PROF: exit:
; CHECK-PROF-NEXT: [[RESULT_IN3_LCSSA:%.*]] = phi ptr [ [[RESULT_IN3]], [[HEADER]] ]
; CHECK-PROF-NEXT: [[RESULT_LE:%.*]] = load i64, ptr [[RESULT_IN3_LCSSA]], align 8
; CHECK-PROF-NEXT: ret i64 [[RESULT_LE]]
;
; CHECK-NOTPROF-LABEL: define i64 @predicate_eq_zeroes(
; CHECK-NOTPROF-SAME: ptr nocapture readonly [[ARG:%.*]], i32 [[LENGTH:%.*]], ptr nocapture readonly [[ARG2:%.*]], ptr nocapture readonly [[N_ADDR:%.*]], i64 [[I:%.*]]) !prof [[PROF0]] {
; CHECK-NOTPROF-NEXT: entry:
; CHECK-NOTPROF-NEXT: [[LENGTH_EXT:%.*]] = zext i32 [[LENGTH]] to i64
; CHECK-NOTPROF-NEXT: [[N_PRE:%.*]] = load i64, ptr [[N_ADDR]], align 4
; CHECK-NOTPROF-NEXT: br label [[HEADER:%.*]]
; CHECK-NOTPROF: Header:
; CHECK-NOTPROF-NEXT: [[RESULT_IN3:%.*]] = phi ptr [ [[ARG2]], [[ENTRY:%.*]] ], [ [[ARG]], [[LATCH:%.*]] ]
; CHECK-NOTPROF-NEXT: [[J2:%.*]] = phi i64 [ 0, [[ENTRY]] ], [ [[J_NEXT:%.*]], [[LATCH]] ]
; CHECK-NOTPROF-NEXT: [[WITHIN_BOUNDS:%.*]] = icmp ult i64 [[J2]], [[LENGTH_EXT]]
; CHECK-NOTPROF-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[WITHIN_BOUNDS]], i32 9) [ "deopt"() ]
; CHECK-NOTPROF-NEXT: [[INNERCMP:%.*]] = icmp eq i64 [[J2]], [[N_PRE]]
; CHECK-NOTPROF-NEXT: [[J_NEXT]] = add nuw nsw i64 [[J2]], 1
; CHECK-NOTPROF-NEXT: br i1 [[INNERCMP]], label [[LATCH]], label [[EXIT:%.*]], !prof [[PROF3:![0-9]+]]
; CHECK-NOTPROF: Latch:
; CHECK-NOTPROF-NEXT: [[SPECULATE_TRIP_COUNT:%.*]] = icmp ult i64 [[J_NEXT]], 1048576
; CHECK-NOTPROF-NEXT: br i1 [[SPECULATE_TRIP_COUNT]], label [[HEADER]], label [[EXITLATCH:%.*]], !prof [[PROF2]]
; CHECK-NOTPROF: exitLatch:
; CHECK-NOTPROF-NEXT: ret i64 1
; CHECK-NOTPROF: exit:
; CHECK-NOTPROF-NEXT: [[RESULT_IN3_LCSSA:%.*]] = phi ptr [ [[RESULT_IN3]], [[HEADER]] ]
; CHECK-NOTPROF-NEXT: [[RESULT_LE:%.*]] = load i64, ptr [[RESULT_IN3_LCSSA]], align 8
; CHECK-NOTPROF-NEXT: ret i64 [[RESULT_LE]]
;
entry:
%length.ext = zext i32 %length to i64
%n.pre = load i64, ptr %n_addr, align 4
br label %Header
Header: ; preds = %entry, %Latch
%result.in3 = phi ptr [ %arg2, %entry ], [ %arg, %Latch ]
%j2 = phi i64 [ 0, %entry ], [ %j.next, %Latch ]
%within.bounds = icmp ult i64 %j2, %length.ext
call void (i1, ...) @llvm.experimental.guard(i1 %within.bounds, i32 9) [ "deopt"() ]
%innercmp = icmp eq i64 %j2, %n.pre
%j.next = add nuw nsw i64 %j2, 1
br i1 %innercmp, label %Latch, label %exit, !prof !1
Latch: ; preds = %Header
%speculate_trip_count = icmp ult i64 %j.next, 1048576
br i1 %speculate_trip_count, label %Header, label %exitLatch, !prof !2
exitLatch: ; preds = %Latch
ret i64 1
exit: ; preds = %Header
%result.in3.lcssa = phi ptr [ %result.in3, %Header ]
%result.le = load i64, ptr %result.in3.lcssa, align 8
ret i64 %result.le
}
!1 = !{!"branch_weights", i32 0, i32 0}
; No profile on br in Header
define i64 @predicate_eq_none(ptr nocapture readonly %arg, i32 %length, ptr nocapture readonly %arg2, ptr nocapture readonly %n_addr, i64 %i) !prof !21 {
; CHECK-PROF-LABEL: define i64 @predicate_eq_none(
; CHECK-PROF-SAME: ptr nocapture readonly [[ARG:%.*]], i32 [[LENGTH:%.*]], ptr nocapture readonly [[ARG2:%.*]], ptr nocapture readonly [[N_ADDR:%.*]], i64 [[I:%.*]]) !prof [[PROF0]] {
; CHECK-PROF-NEXT: entry:
; CHECK-PROF-NEXT: [[LENGTH_EXT:%.*]] = zext i32 [[LENGTH]] to i64
; CHECK-PROF-NEXT: [[N_PRE:%.*]] = load i64, ptr [[N_ADDR]], align 4
; CHECK-PROF-NEXT: [[TMP0:%.*]] = icmp ule i64 1048576, [[LENGTH_EXT]]
; CHECK-PROF-NEXT: [[TMP1:%.*]] = icmp ult i64 0, [[LENGTH_EXT]]
; CHECK-PROF-NEXT: [[TMP2:%.*]] = and i1 [[TMP1]], [[TMP0]]
; CHECK-PROF-NEXT: [[TMP3:%.*]] = freeze i1 [[TMP2]]
; CHECK-PROF-NEXT: br label [[HEADER:%.*]]
; CHECK-PROF: Header:
; CHECK-PROF-NEXT: [[RESULT_IN3:%.*]] = phi ptr [ [[ARG2]], [[ENTRY:%.*]] ], [ [[ARG]], [[LATCH:%.*]] ]
; CHECK-PROF-NEXT: [[J2:%.*]] = phi i64 [ 0, [[ENTRY]] ], [ [[J_NEXT:%.*]], [[LATCH]] ]
; CHECK-PROF-NEXT: [[WITHIN_BOUNDS:%.*]] = icmp ult i64 [[J2]], [[LENGTH_EXT]]
; CHECK-PROF-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[TMP3]], i32 9) [ "deopt"() ]
; CHECK-PROF-NEXT: call void @llvm.assume(i1 [[WITHIN_BOUNDS]])
; CHECK-PROF-NEXT: [[INNERCMP:%.*]] = icmp eq i64 [[J2]], [[N_PRE]]
; CHECK-PROF-NEXT: [[J_NEXT]] = add nuw nsw i64 [[J2]], 1
; CHECK-PROF-NEXT: br i1 [[INNERCMP]], label [[LATCH]], label [[EXIT:%.*]]
; CHECK-PROF: Latch:
; CHECK-PROF-NEXT: [[SPECULATE_TRIP_COUNT:%.*]] = icmp ult i64 [[J_NEXT]], 1048576
; CHECK-PROF-NEXT: br i1 [[SPECULATE_TRIP_COUNT]], label [[HEADER]], label [[EXITLATCH:%.*]], !prof [[PROF2]]
; CHECK-PROF: exitLatch:
; CHECK-PROF-NEXT: ret i64 1
; CHECK-PROF: exit:
; CHECK-PROF-NEXT: [[RESULT_IN3_LCSSA:%.*]] = phi ptr [ [[RESULT_IN3]], [[HEADER]] ]
; CHECK-PROF-NEXT: [[RESULT_LE:%.*]] = load i64, ptr [[RESULT_IN3_LCSSA]], align 8
; CHECK-PROF-NEXT: ret i64 [[RESULT_LE]]
;
; CHECK-NOTPROF-LABEL: define i64 @predicate_eq_none(
; CHECK-NOTPROF-SAME: ptr nocapture readonly [[ARG:%.*]], i32 [[LENGTH:%.*]], ptr nocapture readonly [[ARG2:%.*]], ptr nocapture readonly [[N_ADDR:%.*]], i64 [[I:%.*]]) !prof [[PROF0]] {
; CHECK-NOTPROF-NEXT: entry:
; CHECK-NOTPROF-NEXT: [[LENGTH_EXT:%.*]] = zext i32 [[LENGTH]] to i64
; CHECK-NOTPROF-NEXT: [[N_PRE:%.*]] = load i64, ptr [[N_ADDR]], align 4
; CHECK-NOTPROF-NEXT: br label [[HEADER:%.*]]
; CHECK-NOTPROF: Header:
; CHECK-NOTPROF-NEXT: [[RESULT_IN3:%.*]] = phi ptr [ [[ARG2]], [[ENTRY:%.*]] ], [ [[ARG]], [[LATCH:%.*]] ]
; CHECK-NOTPROF-NEXT: [[J2:%.*]] = phi i64 [ 0, [[ENTRY]] ], [ [[J_NEXT:%.*]], [[LATCH]] ]
; CHECK-NOTPROF-NEXT: [[WITHIN_BOUNDS:%.*]] = icmp ult i64 [[J2]], [[LENGTH_EXT]]
; CHECK-NOTPROF-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[WITHIN_BOUNDS]], i32 9) [ "deopt"() ]
; CHECK-NOTPROF-NEXT: [[INNERCMP:%.*]] = icmp eq i64 [[J2]], [[N_PRE]]
; CHECK-NOTPROF-NEXT: [[J_NEXT]] = add nuw nsw i64 [[J2]], 1
; CHECK-NOTPROF-NEXT: br i1 [[INNERCMP]], label [[LATCH]], label [[EXIT:%.*]]
; CHECK-NOTPROF: Latch:
; CHECK-NOTPROF-NEXT: [[SPECULATE_TRIP_COUNT:%.*]] = icmp ult i64 [[J_NEXT]], 1048576
; CHECK-NOTPROF-NEXT: br i1 [[SPECULATE_TRIP_COUNT]], label [[HEADER]], label [[EXITLATCH:%.*]], !prof [[PROF2]]
; CHECK-NOTPROF: exitLatch:
; CHECK-NOTPROF-NEXT: ret i64 1
; CHECK-NOTPROF: exit:
; CHECK-NOTPROF-NEXT: [[RESULT_IN3_LCSSA:%.*]] = phi ptr [ [[RESULT_IN3]], [[HEADER]] ]
; CHECK-NOTPROF-NEXT: [[RESULT_LE:%.*]] = load i64, ptr [[RESULT_IN3_LCSSA]], align 8
; CHECK-NOTPROF-NEXT: ret i64 [[RESULT_LE]]
;
entry:
%length.ext = zext i32 %length to i64
%n.pre = load i64, ptr %n_addr, align 4
br label %Header
Header: ; preds = %entry, %Latch
%result.in3 = phi ptr [ %arg2, %entry ], [ %arg, %Latch ]
%j2 = phi i64 [ 0, %entry ], [ %j.next, %Latch ]
%within.bounds = icmp ult i64 %j2, %length.ext
call void (i1, ...) @llvm.experimental.guard(i1 %within.bounds, i32 9) [ "deopt"() ]
%innercmp = icmp eq i64 %j2, %n.pre
%j.next = add nuw nsw i64 %j2, 1
br i1 %innercmp, label %Latch, label %exit
Latch: ; preds = %Header
%speculate_trip_count = icmp ult i64 %j.next, 1048576
br i1 %speculate_trip_count, label %Header, label %exitLatch, !prof !2
exitLatch: ; preds = %Latch
ret i64 1
exit: ; preds = %Header
%result.in3.lcssa = phi ptr [ %result.in3, %Header ]
%result.le = load i64, ptr %result.in3.lcssa, align 8
ret i64 %result.le
}
!2 = !{!"branch_weights", i32 3, i32 1}
!21 = !{!"function_entry_count", i64 20000}
declare i64 @llvm.experimental.deoptimize.i64(...)
declare void @llvm.experimental.guard(i1, ...)