[llvm] 2079798 - Outline non returning functions unless a longjmp
via llvm-commits
llvm-commits at lists.llvm.org
Sat Aug 1 22:28:41 PDT 2020
Author: AK
Date: 2020-08-01T22:16:14-07:00
New Revision: 20797989ea190f2ef22d13c5a7a0535fe9afa58b
URL: https://github.com/llvm/llvm-project/commit/20797989ea190f2ef22d13c5a7a0535fe9afa58b
DIFF: https://github.com/llvm/llvm-project/commit/20797989ea190f2ef22d13c5a7a0535fe9afa58b.diff
LOG: Outline non returning functions unless a longjmp
__assert_fail, abort, exit etc. are cold.
TODO: outline throw
Authored by: rjf (Ruijie Fang)
Reviewed by: hiraditya,tejohnson,fhahn
Differential Revision: https://reviews.llvm.org/D69257
Added:
llvm/test/Transforms/HotColdSplit/longjmp-nosplit.ll
llvm/test/Transforms/HotColdSplit/longjmp-split.ll
llvm/test/Transforms/HotColdSplit/sjlj-nosplit.ll
llvm/test/Transforms/HotColdSplit/sjlj-split.ll
llvm/test/Transforms/HotColdSplit/split-assert-fail.ll
Modified:
llvm/lib/Transforms/IPO/HotColdSplitting.cpp
Removed:
################################################################################
diff --git a/llvm/lib/Transforms/IPO/HotColdSplitting.cpp b/llvm/lib/Transforms/IPO/HotColdSplitting.cpp
index d0bd0166534a7..cdfd9879c030a 100644
--- a/llvm/lib/Transforms/IPO/HotColdSplitting.cpp
+++ b/llvm/lib/Transforms/IPO/HotColdSplitting.cpp
@@ -101,7 +101,8 @@ bool blockEndsInUnreachable(const BasicBlock &BB) {
return !(isa<ReturnInst>(I) || isa<IndirectBrInst>(I));
}
-bool unlikelyExecuted(BasicBlock &BB) {
+bool unlikelyExecuted(BasicBlock &BB, ProfileSummaryInfo *PSI,
+ BlockFrequencyInfo *BFI) {
// Exception handling blocks are unlikely executed.
if (BB.isEHPad() || isa<ResumeInst>(BB.getTerminator()))
return true;
@@ -114,12 +115,19 @@ bool unlikelyExecuted(BasicBlock &BB) {
return true;
// The block is cold if it has an unreachable terminator, unless it's
- // preceded by a call to a (possibly warm) noreturn call (e.g. longjmp).
+ // preceded by a call to a (possibly warm) noreturn call (e.g. longjmp);
+ // in the case of a longjmp, if the block is cold according to
+ // profile information, we mark it as unlikely to be executed as well.
if (blockEndsInUnreachable(BB)) {
if (auto *CI =
dyn_cast_or_null<CallInst>(BB.getTerminator()->getPrevNode()))
- if (CI->hasFnAttr(Attribute::NoReturn))
- return false;
+ if (CI->hasFnAttr(Attribute::NoReturn)) {
+ if (IntrinsicInst *II = dyn_cast<IntrinsicInst>(CI))
+ return (II->getIntrinsicID() != Intrinsic::eh_sjlj_longjmp) ||
+ (BFI && PSI->isColdBlock(&BB, BFI));
+ return !CI->getCalledFunction()->getName().contains("longjmp") ||
+ (BFI && PSI->isColdBlock(&BB, BFI));
+ }
return true;
}
@@ -575,7 +583,7 @@ bool HotColdSplitting::outlineColdRegions(Function &F, bool HasProfileSummary) {
continue;
bool Cold = (BFI && PSI->isColdBlock(BB, BFI)) ||
- (EnableStaticAnalyis && unlikelyExecuted(*BB));
+ (EnableStaticAnalyis && unlikelyExecuted(*BB, PSI, BFI));
if (!Cold)
continue;
diff --git a/llvm/test/Transforms/HotColdSplit/longjmp-nosplit.ll b/llvm/test/Transforms/HotColdSplit/longjmp-nosplit.ll
new file mode 100644
index 0000000000000..d207e8dae3850
--- /dev/null
+++ b/llvm/test/Transforms/HotColdSplit/longjmp-nosplit.ll
@@ -0,0 +1,97 @@
+; RUN: opt -hotcoldsplit -S < %s | FileCheck %s
+target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+%struct.__jmp_buf_tag = type { [8 x i64], i32, %struct.__sigset_t }
+%struct.__sigset_t = type { [16 x i64] }
+
+ at c = dso_local global i32 1, align 4
+ at buf = dso_local global [20 x i8*] zeroinitializer, align 16
+
+; CHECK-LABEL: @f
+; CHECK-NOT: f.cold.1
+define dso_local void @f() #0 {
+entry:
+ %i = alloca i32, align 4
+ %j = alloca i32, align 4
+ %k = alloca i32, align 4
+ %0 = load i32, i32* @c, align 4
+ %tobool = icmp ne i32 %0, 0
+ br i1 %tobool, label %if.then, label %if.else
+
+if.then: ; preds = %entry
+ ret void
+
+if.else: ; preds = %entry
+ %1 = load i32, i32* @c, align 4
+ %inc = add i32 %1, 1
+ store i32 %inc, i32* @c, align 4
+ %2 = load i32, i32* @c, align 4
+ %inc1 = add i32 %2, 1
+ store i32 %inc1, i32* @c, align 4
+ %3 = load i32, i32* @c, align 4
+ %inc2 = add i32 %3, 1
+ store i32 %inc2, i32* @c, align 4
+ %4 = load i32, i32* @c, align 4
+ %inc3 = add i32 %4, 1
+ store i32 %inc3, i32* @c, align 4
+ %5 = load i32, i32* @c, align 4
+ %dec = add i32 %5, -1
+ store i32 %dec, i32* @c, align 4
+ %6 = load i32, i32* @c, align 4
+ %dec4 = add i32 %6, -1
+ store i32 %dec4, i32* @c, align 4
+ %7 = load i32, i32* @c, align 4
+ %inc5 = add i32 %7, 1
+ store i32 %inc5, i32* @c, align 4
+ %8 = load i32, i32* @c, align 4
+ %inc6 = add i32 %8, 1
+ store i32 %inc6, i32* @c, align 4
+ %9 = load i32, i32* @c, align 4
+ %add = add i32 %9, 1
+ store i32 %add, i32* %i, align 4
+ %10 = load i32, i32* %i, align 4
+ %sub = sub i32 %10, 1
+ store i32 %sub, i32* %j, align 4
+ %11 = load i32, i32* %i, align 4
+ %add7 = add i32 %11, 2
+ store i32 %add7, i32* %k, align 4
+ call void @longjmp(%struct.__jmp_buf_tag* bitcast ([20 x i8*]* @buf to %struct.__jmp_buf_tag*), i32 1) #3
+ unreachable
+}
+
+declare dso_local void @longjmp(%struct.__jmp_buf_tag*, i32) #1
+
+; CHECK-LABEL: @main
+; CHECK-NOT: main.cold.1
+define dso_local i32 @main() #0 {
+entry:
+ %retval = alloca i32, align 4
+ %i = alloca i32, align 4
+ store i32 0, i32* %retval, align 4
+ store i32 0, i32* %i, align 4
+ %call = call i32 @_setjmp(%struct.__jmp_buf_tag* bitcast ([20 x i8*]* @buf to %struct.__jmp_buf_tag*)) #4
+ %tobool = icmp ne i32 %call, 0
+ br i1 %tobool, label %if.then, label %if.end
+
+if.then: ; preds = %entry
+ store i32 1, i32* %retval, align 4
+ br label %return
+
+if.end: ; preds = %entry
+ call void @f()
+ store i32 0, i32* %retval, align 4
+ br label %return
+
+return: ; preds = %if.end, %if.then
+ %0 = load i32, i32* %retval, align 4
+ ret i32 %0
+}
+
+declare dso_local i32 @_setjmp(%struct.__jmp_buf_tag*) #2
+
+attributes #0 = { nounwind uwtable }
+attributes #1 = { noreturn nounwind }
+attributes #2 = { nounwind returns_twice }
+attributes #3 = { noreturn nounwind }
+attributes #4 = { nounwind returns_twice }
diff --git a/llvm/test/Transforms/HotColdSplit/longjmp-split.ll b/llvm/test/Transforms/HotColdSplit/longjmp-split.ll
new file mode 100644
index 0000000000000..905f146a79e18
--- /dev/null
+++ b/llvm/test/Transforms/HotColdSplit/longjmp-split.ll
@@ -0,0 +1,132 @@
+; RUN: opt -profile-summary-cold-count=0 -hotcoldsplit -S < %s | FileCheck %s
+
+target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+%struct.__jmp_buf_tag = type { [8 x i64], i32, %struct.__sigset_t }
+%struct.__sigset_t = type { [16 x i64] }
+
+ at c = dso_local global i32 1, align 4
+ at buf = dso_local global [20 x i8*] zeroinitializer, align 16
+
+; CHECK-LABEL: @f
+; CHECK: f.cold.1
+define dso_local void @f() #0 !prof !31 {
+entry:
+ %i = alloca i32, align 4
+ %j = alloca i32, align 4
+ %k = alloca i32, align 4
+ %0 = load i32, i32* @c, align 4
+ %tobool = icmp ne i32 %0, 0
+ br i1 %tobool, label %if.then, label %if.else, !prof !32
+
+if.then: ; preds = %entry
+ ret void
+
+if.else: ; preds = %entry
+ %1 = load i32, i32* @c, align 4
+ %inc = add i32 %1, 1
+ store i32 %inc, i32* @c, align 4
+ %2 = load i32, i32* @c, align 4
+ %inc1 = add i32 %2, 1
+ store i32 %inc1, i32* @c, align 4
+ %3 = load i32, i32* @c, align 4
+ %inc2 = add i32 %3, 1
+ store i32 %inc2, i32* @c, align 4
+ %4 = load i32, i32* @c, align 4
+ %inc3 = add i32 %4, 1
+ store i32 %inc3, i32* @c, align 4
+ %5 = load i32, i32* @c, align 4
+ %dec = add i32 %5, -1
+ store i32 %dec, i32* @c, align 4
+ %6 = load i32, i32* @c, align 4
+ %dec4 = add i32 %6, -1
+ store i32 %dec4, i32* @c, align 4
+ %7 = load i32, i32* @c, align 4
+ %inc5 = add i32 %7, 1
+ store i32 %inc5, i32* @c, align 4
+ %8 = load i32, i32* @c, align 4
+ %inc6 = add i32 %8, 1
+ store i32 %inc6, i32* @c, align 4
+ %9 = load i32, i32* @c, align 4
+ %add = add i32 %9, 1
+ store i32 %add, i32* %i, align 4
+ %10 = load i32, i32* %i, align 4
+ %sub = sub i32 %10, 1
+ store i32 %sub, i32* %j, align 4
+ %11 = load i32, i32* %i, align 4
+ %add7 = add i32 %11, 2
+ store i32 %add7, i32* %k, align 4
+ call void @longjmp(%struct.__jmp_buf_tag* bitcast ([20 x i8*]* @buf to %struct.__jmp_buf_tag*), i32 1) #3
+ unreachable
+}
+
+declare dso_local void @longjmp(%struct.__jmp_buf_tag*, i32) #1
+
+define dso_local i32 @main() #0 !prof !31 {
+entry:
+ %retval = alloca i32, align 4
+ %i = alloca i32, align 4
+ store i32 0, i32* %retval, align 4
+ store i32 0, i32* %i, align 4
+ %call = call i32 @_setjmp(%struct.__jmp_buf_tag* bitcast ([20 x i8*]* @buf to %struct.__jmp_buf_tag*)) #4
+ %tobool = icmp ne i32 %call, 0
+ br i1 %tobool, label %if.then, label %if.end, !prof !33
+
+if.then: ; preds = %entry
+ store i32 1, i32* %retval, align 4
+ br label %return
+
+if.end: ; preds = %entry
+ call void @f()
+ store i32 0, i32* %retval, align 4
+ br label %return
+
+return: ; preds = %if.end, %if.then
+ %0 = load i32, i32* %retval, align 4
+ ret i32 %0
+}
+
+declare dso_local i32 @_setjmp(%struct.__jmp_buf_tag*) #2
+
+attributes #0 = { inlinehint nounwind uwtable }
+attributes #1 = { noreturn nounwind }
+attributes #2 = { nounwind returns_twice }
+attributes #3 = { noreturn nounwind }
+attributes #4 = { nounwind returns_twice }
+
+!llvm.module.flags = !{!0, !1}
+
+!0 = !{i32 1, !"wchar_size", i32 4}
+!1 = !{i32 1, !"ProfileSummary", !2}
+!2 = !{!3, !4, !5, !6, !7, !8, !9, !10, !11, !12}
+!3 = !{!"ProfileFormat", !"InstrProf"}
+!4 = !{!"TotalCount", i64 2}
+!5 = !{!"MaxCount", i64 1}
+!6 = !{!"MaxInternalCount", i64 1}
+!7 = !{!"MaxFunctionCount", i64 1}
+!8 = !{!"NumCounts", i64 4}
+!9 = !{!"NumFunctions", i64 2}
+!10 = !{!"IsPartialProfile", i64 0}
+!11 = !{!"PartialProfileRatio", double 0.000000e+00}
+!12 = !{!"DetailedSummary", !13}
+!13 = !{!14, !15, !16, !17, !18, !19, !20, !21, !22, !23, !24, !25, !26, !27, !28, !29}
+!14 = !{i32 10000, i64 0, i32 0}
+!15 = !{i32 100000, i64 0, i32 0}
+!16 = !{i32 200000, i64 0, i32 0}
+!17 = !{i32 300000, i64 0, i32 0}
+!18 = !{i32 400000, i64 0, i32 0}
+!19 = !{i32 500000, i64 1, i32 2}
+!20 = !{i32 600000, i64 1, i32 2}
+!21 = !{i32 700000, i64 1, i32 2}
+!22 = !{i32 800000, i64 1, i32 2}
+!23 = !{i32 900000, i64 1, i32 2}
+!24 = !{i32 950000, i64 1, i32 2}
+!25 = !{i32 990000, i64 1, i32 2}
+!26 = !{i32 999000, i64 1, i32 2}
+!27 = !{i32 999900, i64 1, i32 2}
+!28 = !{i32 999990, i64 1, i32 2}
+!29 = !{i32 999999, i64 1, i32 2}
+!31 = !{!"function_entry_count", i64 1}
+!32 = !{!"branch_weights", i32 1, i32 0}
+!33 = !{!"branch_weights", i32 0, i32 1}
diff --git a/llvm/test/Transforms/HotColdSplit/sjlj-nosplit.ll b/llvm/test/Transforms/HotColdSplit/sjlj-nosplit.ll
new file mode 100644
index 0000000000000..f02a1b376ecb2
--- /dev/null
+++ b/llvm/test/Transforms/HotColdSplit/sjlj-nosplit.ll
@@ -0,0 +1,103 @@
+; RUN: opt -hotcoldsplit -S < %s | FileCheck %s
+target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+ at c = dso_local global i32 1, align 4
+ at buf = dso_local global [20 x i8*] zeroinitializer, align 16
+
+; CHECK-LABEL: @f
+; CHECK-NOT: f.cold.1
+define dso_local void @f() #0 {
+entry:
+ %i = alloca i32, align 4
+ %j = alloca i32, align 4
+ %k = alloca i32, align 4
+ %0 = load i32, i32* @c, align 4
+ %tobool = icmp ne i32 %0, 0
+ br i1 %tobool, label %if.then, label %if.else
+
+if.then: ; preds = %entry
+ ret void
+
+if.else: ; preds = %entry
+ %1 = load i32, i32* @c, align 4
+ %inc = add nsw i32 %1, 1
+ store i32 %inc, i32* @c, align 4
+ %2 = load i32, i32* @c, align 4
+ %inc1 = add nsw i32 %2, 1
+ store i32 %inc1, i32* @c, align 4
+ %3 = load i32, i32* @c, align 4
+ %inc2 = add nsw i32 %3, 1
+ store i32 %inc2, i32* @c, align 4
+ %4 = load i32, i32* @c, align 4
+ %inc3 = add nsw i32 %4, 1
+ store i32 %inc3, i32* @c, align 4
+ %5 = load i32, i32* @c, align 4
+ %dec = add nsw i32 %5, -1
+ store i32 %dec, i32* @c, align 4
+ %6 = load i32, i32* @c, align 4
+ %dec4 = add nsw i32 %6, -1
+ store i32 %dec4, i32* @c, align 4
+ %7 = load i32, i32* @c, align 4
+ %inc5 = add nsw i32 %7, 1
+ store i32 %inc5, i32* @c, align 4
+ %8 = load i32, i32* @c, align 4
+ %inc6 = add nsw i32 %8, 1
+ store i32 %inc6, i32* @c, align 4
+ %9 = load i32, i32* @c, align 4
+ %add = add nsw i32 %9, 1
+ store i32 %add, i32* %i, align 4
+ %10 = load i32, i32* %i, align 4
+ %sub = sub nsw i32 %10, 1
+ store i32 %sub, i32* %j, align 4
+ %11 = load i32, i32* %i, align 4
+ %add7 = add nsw i32 %11, 2
+ store i32 %add7, i32* %k, align 4
+ call void @llvm.eh.sjlj.longjmp(i8* bitcast ([20 x i8*]* @buf to i8*))
+ unreachable
+}
+
+declare void @llvm.eh.sjlj.longjmp(i8*) #1
+
+; CHECK-LABEL: @main
+; CHECK-NOT: main.cold.1
+define dso_local i32 @main() #0 {
+entry:
+ %retval = alloca i32, align 4
+ %i = alloca i32, align 4
+ store i32 0, i32* %retval, align 4
+ store i32 0, i32* %i, align 4
+ %0 = call i8* @llvm.frameaddress.p0i8(i32 0)
+ store i8* %0, i8** getelementptr inbounds ([20 x i8*], [20 x i8*]* @buf, i64 0, i64 0), align 16
+ %1 = call i8* @llvm.stacksave()
+ store i8* %1, i8** getelementptr inbounds ([20 x i8*], [20 x i8*]* @buf, i64 0, i64 2), align 16
+ %2 = call i32 @llvm.eh.sjlj.setjmp(i8* bitcast ([20 x i8*]* @buf to i8*))
+ %tobool = icmp ne i32 %2, 0
+ br i1 %tobool, label %if.then, label %if.end
+
+if.then: ; preds = %entry
+ store i32 1, i32* %retval, align 4
+ br label %return
+
+if.end: ; preds = %entry
+ call void @f()
+ store i32 0, i32* %retval, align 4
+ br label %return
+
+return: ; preds = %if.end, %if.then
+ %3 = load i32, i32* %retval, align 4
+ ret i32 %3
+}
+
+declare i8* @llvm.frameaddress.p0i8(i32 immarg) #2
+
+declare i8* @llvm.stacksave() #3
+
+declare i32 @llvm.eh.sjlj.setjmp(i8*) #3
+
+attributes #0 = { nounwind uwtable }
+attributes #1 = { noreturn nounwind }
+attributes #2 = { nounwind readnone }
+attributes #3 = { nounwind }
+
+
diff --git a/llvm/test/Transforms/HotColdSplit/sjlj-split.ll b/llvm/test/Transforms/HotColdSplit/sjlj-split.ll
new file mode 100644
index 0000000000000..3a12677ecf519
--- /dev/null
+++ b/llvm/test/Transforms/HotColdSplit/sjlj-split.ll
@@ -0,0 +1,136 @@
+; RUN: opt -profile-summary-cold-count=0 -hotcoldsplit -S < %s | FileCheck %s
+target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+ at c = dso_local global i32 1, align 4
+ at buf = dso_local global [20 x i8*] zeroinitializer, align 16
+
+; CHECK-LABEL: @f
+; CHECK: f.cold.1
+define dso_local void @f() #0 !prof !31 {
+entry:
+ %i = alloca i32, align 4
+ %j = alloca i32, align 4
+ %k = alloca i32, align 4
+ %0 = load i32, i32* @c, align 4
+ %tobool = icmp ne i32 %0, 0
+ br i1 %tobool, label %if.then, label %if.else, !prof !32
+
+if.then: ; preds = %entry
+ ret void
+
+if.else: ; preds = %entry
+ %1 = load i32, i32* @c, align 4
+ %inc = add i32 %1, 1
+ store i32 %inc, i32* @c, align 4
+ %2 = load i32, i32* @c, align 4
+ %inc1 = add i32 %2, 1
+ store i32 %inc1, i32* @c, align 4
+ %3 = load i32, i32* @c, align 4
+ %inc2 = add i32 %3, 1
+ store i32 %inc2, i32* @c, align 4
+ %4 = load i32, i32* @c, align 4
+ %inc3 = add i32 %4, 1
+ store i32 %inc3, i32* @c, align 4
+ %5 = load i32, i32* @c, align 4
+ %dec = add i32 %5, -1
+ store i32 %dec, i32* @c, align 4
+ %6 = load i32, i32* @c, align 4
+ %dec4 = add i32 %6, -1
+ store i32 %dec4, i32* @c, align 4
+ %7 = load i32, i32* @c, align 4
+ %inc5 = add i32 %7, 1
+ store i32 %inc5, i32* @c, align 4
+ %8 = load i32, i32* @c, align 4
+ %inc6 = add i32 %8, 1
+ store i32 %inc6, i32* @c, align 4
+ %9 = load i32, i32* @c, align 4
+ %add = add i32 %9, 1
+ store i32 %add, i32* %i, align 4
+ %10 = load i32, i32* %i, align 4
+ %sub = sub i32 %10, 1
+ store i32 %sub, i32* %j, align 4
+ %11 = load i32, i32* %i, align 4
+ %add7 = add i32 %11, 2
+ store i32 %add7, i32* %k, align 4
+ call void @llvm.eh.sjlj.longjmp(i8* bitcast ([20 x i8*]* @buf to i8*))
+ unreachable
+}
+
+declare void @llvm.eh.sjlj.longjmp(i8*) #1
+
+define dso_local i32 @main() #0 !prof !31 {
+entry:
+ %retval = alloca i32, align 4
+ %i = alloca i32, align 4
+ store i32 0, i32* %retval, align 4
+ store i32 0, i32* %i, align 4
+ %0 = call i8* @llvm.frameaddress.p0i8(i32 0)
+ store i8* %0, i8** getelementptr inbounds ([20 x i8*], [20 x i8*]* @buf, i64 0, i64 0), align 16
+ %1 = call i8* @llvm.stacksave()
+ store i8* %1, i8** getelementptr inbounds ([20 x i8*], [20 x i8*]* @buf, i64 0, i64 2), align 16
+ %2 = call i32 @llvm.eh.sjlj.setjmp(i8* bitcast ([20 x i8*]* @buf to i8*))
+ %tobool = icmp ne i32 %2, 0
+ br i1 %tobool, label %if.then, label %if.end, !prof !33
+
+if.then: ; preds = %entry
+ store i32 1, i32* %retval, align 4
+ br label %return
+
+if.end: ; preds = %entry
+ call void @f()
+ store i32 0, i32* %retval, align 4
+ br label %return
+
+return: ; preds = %if.end, %if.then
+ %3 = load i32, i32* %retval, align 4
+ ret i32 %3
+}
+
+declare i8* @llvm.frameaddress.p0i8(i32 immarg) #2
+
+declare i8* @llvm.stacksave() #3
+
+declare i32 @llvm.eh.sjlj.setjmp(i8*) #3
+
+attributes #0 = { inlinehint nounwind uwtable }
+attributes #1 = { noreturn nounwind }
+attributes #2 = { nounwind readnone }
+attributes #3 = { nounwind }
+
+!llvm.module.flags = !{!0, !1}
+
+!0 = !{i32 1, !"wchar_size", i32 4}
+!1 = !{i32 1, !"ProfileSummary", !2}
+!2 = !{!3, !4, !5, !6, !7, !8, !9, !10, !11, !12}
+!3 = !{!"ProfileFormat", !"InstrProf"}
+!4 = !{!"TotalCount", i64 2}
+!5 = !{!"MaxCount", i64 1}
+!6 = !{!"MaxInternalCount", i64 1}
+!7 = !{!"MaxFunctionCount", i64 1}
+!8 = !{!"NumCounts", i64 4}
+!9 = !{!"NumFunctions", i64 2}
+!10 = !{!"IsPartialProfile", i64 0}
+!11 = !{!"PartialProfileRatio", double 0.000000e+00}
+!12 = !{!"DetailedSummary", !13}
+!13 = !{!14, !15, !16, !17, !18, !19, !20, !21, !22, !23, !24, !25, !26, !27, !28, !29}
+!14 = !{i32 10000, i64 0, i32 0}
+!15 = !{i32 100000, i64 0, i32 0}
+!16 = !{i32 200000, i64 0, i32 0}
+!17 = !{i32 300000, i64 0, i32 0}
+!18 = !{i32 400000, i64 0, i32 0}
+!19 = !{i32 500000, i64 1, i32 2}
+!20 = !{i32 600000, i64 1, i32 2}
+!21 = !{i32 700000, i64 1, i32 2}
+!22 = !{i32 800000, i64 1, i32 2}
+!23 = !{i32 900000, i64 1, i32 2}
+!24 = !{i32 950000, i64 1, i32 2}
+!25 = !{i32 990000, i64 1, i32 2}
+!26 = !{i32 999000, i64 1, i32 2}
+!27 = !{i32 999900, i64 1, i32 2}
+!28 = !{i32 999990, i64 1, i32 2}
+!29 = !{i32 999999, i64 1, i32 2}
+!31 = !{!"function_entry_count", i64 1}
+!32 = !{!"branch_weights", i32 1, i32 0}
+!33 = !{!"branch_weights", i32 0, i32 1}
+
diff --git a/llvm/test/Transforms/HotColdSplit/split-assert-fail.ll b/llvm/test/Transforms/HotColdSplit/split-assert-fail.ll
new file mode 100644
index 0000000000000..ea5f4b9114917
--- /dev/null
+++ b/llvm/test/Transforms/HotColdSplit/split-assert-fail.ll
@@ -0,0 +1,47 @@
+; REQUIRES: asserts
+; RUN: opt -S -instsimplify -hotcoldsplit -debug < %s 2>&1 | FileCheck %s
+; RUN: opt -instcombine -hotcoldsplit -instsimplify %s -o /dev/null
+
+target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+ at .str = private unnamed_addr constant [2 x i8] c"0\00", align 1
+ at .str.1 = private unnamed_addr constant [14 x i8] c"assert-fail.c\00", align 1
+ at __PRETTY_FUNCTION__.main = private unnamed_addr constant [15 x i8] c"int main(void)\00", align 1
+
+; CHECK: @f
+; CHECK-LABEL: codeRepl:
+; CHECK }
+; CHECK: define {{.*}}@f.cold.1()
+; CHECK-LABEL: newFuncRoot:
+; CHECK: br label %if.then
+
+; Function Attrs: nounwind willreturn
+define i32 @f() #0 {
+entry:
+ %retval = alloca i32, align 4
+ %i = alloca i32, align 4
+ store i32 0, i32* %retval, align 4
+ store i32 0, i32* %i, align 4
+ %0 = load i32, i32* %i, align 4
+ %cmp = icmp eq i32 %0, 2
+ br i1 %cmp, label %if.then, label %if.end
+
+if.then: ; preds = %entry
+ call void @__assert_fail(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.1, i64 0, i64 0), i32 10, i8* getelementptr inbounds ([15 x i8], [15 x i8]* @__PRETTY_FUNCTION__.main, i64 0, i64 0)) #1
+ unreachable
+
+if.end: ; preds = %entry
+ %1 = load i32, i32* %i, align 4
+ %add = add nsw i32 %1, 1
+ store i32 %add, i32* %i, align 4
+ %2 = load i32, i32* %i, align 4
+ ret i32 %2
+}
+
+; Function Attrs: noreturn nounwind
+declare dso_local void @__assert_fail(i8*, i8*, i32, i8*) #1
+
+attributes #0 = { nounwind willreturn }
+attributes #1 = { noreturn nounwind }
+
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