[llvm] perf/goldsteinn/deduce cold attrs (PR #101298)
via llvm-commits
llvm-commits at lists.llvm.org
Wed Jul 31 00:47:15 PDT 2024
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-llvm-transforms
Author: None (goldsteinn)
<details>
<summary>Changes</summary>
- **[FunctionAttrs] Add tests for deducing attr `cold` on functions; NFC**
- **[FunctionAttrs] deduce attr `cold` on functions if all CG paths call a `cold` function**
---
Patch is 33.32 KiB, truncated to 20.00 KiB below, full version: https://github.com/llvm/llvm-project/pull/101298.diff
2 Files Affected:
- (modified) llvm/lib/Transforms/IPO/FunctionAttrs.cpp (+65)
- (added) llvm/test/Transforms/FunctionAttrs/cold.ll (+880)
``````````diff
diff --git a/llvm/lib/Transforms/IPO/FunctionAttrs.cpp b/llvm/lib/Transforms/IPO/FunctionAttrs.cpp
index d50218aaa3b6c..918842a33f08f 100644
--- a/llvm/lib/Transforms/IPO/FunctionAttrs.cpp
+++ b/llvm/lib/Transforms/IPO/FunctionAttrs.cpp
@@ -82,6 +82,7 @@ STATISTIC(NumNoUnwind, "Number of functions marked as nounwind");
STATISTIC(NumNoFree, "Number of functions marked as nofree");
STATISTIC(NumWillReturn, "Number of functions marked as willreturn");
STATISTIC(NumNoSync, "Number of functions marked as nosync");
+STATISTIC(NumCold, "Number of functions marked as cold");
STATISTIC(NumThinLinkNoRecurse,
"Number of functions marked as norecurse during thinlink");
@@ -1745,6 +1746,7 @@ static bool canReturn(Function &F) {
return false;
}
+
// Set the noreturn function attribute if possible.
static void addNoReturnAttrs(const SCCNodeSet &SCCNodes,
SmallSet<Function *, 8> &Changed) {
@@ -1760,6 +1762,65 @@ static void addNoReturnAttrs(const SCCNodeSet &SCCNodes,
}
}
+static bool
+allBBPathsGoThroughCold(BasicBlock *BB,
+ SmallDenseMap<BasicBlock *, bool, 16> &Visited) {
+ // If BB contains a cold callsite this path through the CG is cold.
+ if (any_of(*BB, [](Instruction &I) {
+ if (auto *CB = dyn_cast<CallBase>(&I))
+ return CB->hasFnAttr(Attribute::Cold);
+ return false;
+ })) {
+ Visited[BB] = true;
+ return true;
+ }
+
+ auto Succs = successors(BB);
+ // We found a path that doesn't go through any cold callsite.
+ if (Succs.empty())
+ return false;
+
+ for (auto *Succ : Succs) {
+ // Start with false, this is necessary to ensure we don't turn loops into
+ // cold.
+ auto R = Visited.try_emplace(Succ, false);
+ if (!R.second) {
+ if (R.first->second)
+ continue;
+ return false;
+ }
+ if (!allBBPathsGoThroughCold(Succ, Visited))
+ return false;
+ Visited[Succ] = true;
+ }
+
+ return true;
+}
+
+static bool allPathsGoThroughCold(Function &F) {
+ SmallDenseMap<BasicBlock *, bool, 16> Visited;
+ Visited[&F.front()] = false;
+ return allBBPathsGoThroughCold(&F.front(), Visited);
+}
+
+// Set the cold function attribute if possible.
+static void addColdAttrs(const SCCNodeSet &SCCNodes,
+ SmallSet<Function *, 8> &Changed) {
+ for (Function *F : SCCNodes) {
+ if (!F || !F->hasExactDefinition() || F->hasFnAttribute(Attribute::Naked) ||
+ F->hasFnAttribute(Attribute::Cold) || F->hasFnAttribute(Attribute::Hot))
+ continue;
+
+ // Potential TODO: We could add attribute `cold` on functions with `coldcc`.
+ if (allPathsGoThroughCold(*F)) {
+ F->addFnAttr(Attribute::Cold);
+ ++NumCold;
+ Changed.insert(F);
+ continue;
+ }
+ }
+}
+
static bool functionWillReturn(const Function &F) {
// We can infer and propagate function attributes only when we know that the
// definition we'll get at link time is *exactly* the definition we see now.
@@ -1789,6 +1850,7 @@ static bool functionWillReturn(const Function &F) {
});
}
+
// Set the willreturn function attribute if possible.
static void addWillReturn(const SCCNodeSet &SCCNodes,
SmallSet<Function *, 8> &Changed) {
@@ -1802,6 +1864,8 @@ static void addWillReturn(const SCCNodeSet &SCCNodes,
}
}
+
+
static SCCNodesResult createSCCNodeSet(ArrayRef<Function *> Functions) {
SCCNodesResult Res;
Res.HasUnknownCall = false;
@@ -1853,6 +1917,7 @@ deriveAttrsInPostOrder(ArrayRef<Function *> Functions, AARGetterT &&AARGetter,
addArgumentAttrs(Nodes.SCCNodes, Changed);
inferConvergent(Nodes.SCCNodes, Changed);
addNoReturnAttrs(Nodes.SCCNodes, Changed);
+ addColdAttrs(Nodes.SCCNodes, Changed);
addWillReturn(Nodes.SCCNodes, Changed);
addNoUndefAttrs(Nodes.SCCNodes, Changed);
diff --git a/llvm/test/Transforms/FunctionAttrs/cold.ll b/llvm/test/Transforms/FunctionAttrs/cold.ll
new file mode 100644
index 0000000000000..a205fbda06212
--- /dev/null
+++ b/llvm/test/Transforms/FunctionAttrs/cold.ll
@@ -0,0 +1,880 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-attributes --check-globals --version 2
+; RUN: opt -passes=function-attrs -S < %s | FileCheck --check-prefixes=COMMON,FNATTRS %s
+; RUN: opt -passes=attributor-light -S < %s | FileCheck --check-prefixes=COMMON,ATTRIBUTOR %s
+
+declare i32 @get_val()
+
+declare void @cold0() cold
+declare void @cold1() cold
+declare void @cold_at_cb()
+
+declare void @not_cold0()
+declare void @not_cold1()
+declare void @not_cold2()
+
+define void @test_no_exit_fail() {
+; COMMON: Function Attrs: nofree norecurse noreturn nosync nounwind memory(none)
+; COMMON-LABEL: define void @test_no_exit_fail
+; COMMON-SAME: () #[[ATTR1:[0-9]+]] {
+; COMMON-NEXT: entry:
+; COMMON-NEXT: br label [[WHILE_BODY:%.*]]
+; COMMON: while.body:
+; COMMON-NEXT: br label [[WHILE_BODY]]
+;
+entry:
+ br label %while.body
+
+while.body:
+ br label %while.body
+}
+
+define void @test_no_exit_fail2() {
+; COMMON: Function Attrs: noreturn
+; COMMON-LABEL: define void @test_no_exit_fail2
+; COMMON-SAME: () #[[ATTR2:[0-9]+]] {
+; COMMON-NEXT: entry:
+; COMMON-NEXT: br label [[WHILE_BODY:%.*]]
+; COMMON: while.body:
+; COMMON-NEXT: call void @not_cold0()
+; COMMON-NEXT: br label [[WHILE_BODY2:%.*]]
+; COMMON: while.body2:
+; COMMON-NEXT: call void @not_cold1()
+; COMMON-NEXT: br label [[WHILE_BODY]]
+;
+entry:
+ br label %while.body
+
+while.body:
+ call void @not_cold0()
+ br label %while.body2
+
+while.body2:
+ call void @not_cold1()
+ br label %while.body
+}
+
+define void @test_no_exit() {
+; FNATTRS: Function Attrs: cold noreturn
+; FNATTRS-LABEL: define void @test_no_exit
+; FNATTRS-SAME: () #[[ATTR3:[0-9]+]] {
+; FNATTRS-NEXT: entry:
+; FNATTRS-NEXT: br label [[WHILE_BODY:%.*]]
+; FNATTRS: while.body:
+; FNATTRS-NEXT: call void @cold0()
+; FNATTRS-NEXT: br label [[WHILE_BODY]]
+;
+; ATTRIBUTOR: Function Attrs: noreturn
+; ATTRIBUTOR-LABEL: define void @test_no_exit
+; ATTRIBUTOR-SAME: () #[[ATTR2]] {
+; ATTRIBUTOR-NEXT: entry:
+; ATTRIBUTOR-NEXT: br label [[WHILE_BODY:%.*]]
+; ATTRIBUTOR: while.body:
+; ATTRIBUTOR-NEXT: call void @cold0()
+; ATTRIBUTOR-NEXT: br label [[WHILE_BODY]]
+;
+entry:
+ br label %while.body
+
+while.body:
+ call void @cold0()
+ br label %while.body
+}
+
+define void @test_no_exit2() {
+; FNATTRS: Function Attrs: cold noreturn
+; FNATTRS-LABEL: define void @test_no_exit2
+; FNATTRS-SAME: () #[[ATTR3]] {
+; FNATTRS-NEXT: entry:
+; FNATTRS-NEXT: br label [[WHILE_BODY:%.*]]
+; FNATTRS: while.body:
+; FNATTRS-NEXT: call void @not_cold0()
+; FNATTRS-NEXT: br label [[WHILE_BODY2:%.*]]
+; FNATTRS: while.body2:
+; FNATTRS-NEXT: call void @cold1()
+; FNATTRS-NEXT: br label [[WHILE_BODY]]
+;
+; ATTRIBUTOR: Function Attrs: noreturn
+; ATTRIBUTOR-LABEL: define void @test_no_exit2
+; ATTRIBUTOR-SAME: () #[[ATTR2]] {
+; ATTRIBUTOR-NEXT: entry:
+; ATTRIBUTOR-NEXT: br label [[WHILE_BODY:%.*]]
+; ATTRIBUTOR: while.body:
+; ATTRIBUTOR-NEXT: call void @not_cold0()
+; ATTRIBUTOR-NEXT: br label [[WHILE_BODY2:%.*]]
+; ATTRIBUTOR: while.body2:
+; ATTRIBUTOR-NEXT: call void @cold1()
+; ATTRIBUTOR-NEXT: br label [[WHILE_BODY]]
+;
+entry:
+ br label %while.body
+
+while.body:
+ call void @not_cold0()
+ br label %while.body2
+
+while.body2:
+ call void @cold1()
+ br label %while.body
+}
+
+define dso_local void @test_entry(i32 noundef %x) {
+; FNATTRS: Function Attrs: cold
+; FNATTRS-LABEL: define dso_local void @test_entry
+; FNATTRS-SAME: (i32 noundef [[X:%.*]]) #[[ATTR0:[0-9]+]] {
+; FNATTRS-NEXT: entry:
+; FNATTRS-NEXT: tail call void @cold0()
+; FNATTRS-NEXT: [[TOBOOL_NOT:%.*]] = icmp eq i32 [[X]], 0
+; FNATTRS-NEXT: br i1 [[TOBOOL_NOT]], label [[IF_END:%.*]], label [[IF_THEN:%.*]]
+; FNATTRS: if.then:
+; FNATTRS-NEXT: tail call void @not_cold0()
+; FNATTRS-NEXT: br label [[IF_END]]
+; FNATTRS: if.end:
+; FNATTRS-NEXT: tail call void @not_cold1()
+; FNATTRS-NEXT: ret void
+;
+; ATTRIBUTOR-LABEL: define dso_local void @test_entry
+; ATTRIBUTOR-SAME: (i32 noundef [[X:%.*]]) {
+; ATTRIBUTOR-NEXT: entry:
+; ATTRIBUTOR-NEXT: tail call void @cold0()
+; ATTRIBUTOR-NEXT: [[TOBOOL_NOT:%.*]] = icmp eq i32 [[X]], 0
+; ATTRIBUTOR-NEXT: br i1 [[TOBOOL_NOT]], label [[IF_END:%.*]], label [[IF_THEN:%.*]]
+; ATTRIBUTOR: if.then:
+; ATTRIBUTOR-NEXT: tail call void @not_cold0()
+; ATTRIBUTOR-NEXT: br label [[IF_END]]
+; ATTRIBUTOR: if.end:
+; ATTRIBUTOR-NEXT: tail call void @not_cold1()
+; ATTRIBUTOR-NEXT: ret void
+;
+entry:
+ tail call void @cold0()
+ %tobool.not = icmp eq i32 %x, 0
+ br i1 %tobool.not, label %if.end, label %if.then
+
+if.then:
+ tail call void @not_cold0()
+ br label %if.end
+
+if.end:
+ tail call void @not_cold1()
+ ret void
+}
+
+define dso_local void @test_hot_fail(i32 noundef %x) hot {
+; FNATTRS: Function Attrs: hot
+; FNATTRS-LABEL: define dso_local void @test_hot_fail
+; FNATTRS-SAME: (i32 noundef [[X:%.*]]) #[[ATTR4:[0-9]+]] {
+; FNATTRS-NEXT: entry:
+; FNATTRS-NEXT: tail call void @cold0()
+; FNATTRS-NEXT: ret void
+;
+; ATTRIBUTOR: Function Attrs: hot
+; ATTRIBUTOR-LABEL: define dso_local void @test_hot_fail
+; ATTRIBUTOR-SAME: (i32 noundef [[X:%.*]]) #[[ATTR3:[0-9]+]] {
+; ATTRIBUTOR-NEXT: entry:
+; ATTRIBUTOR-NEXT: tail call void @cold0()
+; ATTRIBUTOR-NEXT: ret void
+;
+entry:
+ tail call void @cold0()
+ ret void
+}
+
+define dso_local void @test_br2(i32 noundef %x) {
+; FNATTRS: Function Attrs: cold
+; FNATTRS-LABEL: define dso_local void @test_br2
+; FNATTRS-SAME: (i32 noundef [[X:%.*]]) #[[ATTR0]] {
+; FNATTRS-NEXT: entry:
+; FNATTRS-NEXT: [[TOBOOL_NOT:%.*]] = icmp eq i32 [[X]], 0
+; FNATTRS-NEXT: br i1 [[TOBOOL_NOT]], label [[IF_ELSE:%.*]], label [[IF_THEN:%.*]]
+; FNATTRS: if.then:
+; FNATTRS-NEXT: tail call void @cold0()
+; FNATTRS-NEXT: br label [[IF_END:%.*]]
+; FNATTRS: if.else:
+; FNATTRS-NEXT: tail call void @cold1()
+; FNATTRS-NEXT: br label [[IF_END]]
+; FNATTRS: if.end:
+; FNATTRS-NEXT: ret void
+;
+; ATTRIBUTOR-LABEL: define dso_local void @test_br2
+; ATTRIBUTOR-SAME: (i32 noundef [[X:%.*]]) {
+; ATTRIBUTOR-NEXT: entry:
+; ATTRIBUTOR-NEXT: [[TOBOOL_NOT:%.*]] = icmp eq i32 [[X]], 0
+; ATTRIBUTOR-NEXT: br i1 [[TOBOOL_NOT]], label [[IF_ELSE:%.*]], label [[IF_THEN:%.*]]
+; ATTRIBUTOR: if.then:
+; ATTRIBUTOR-NEXT: tail call void @cold0()
+; ATTRIBUTOR-NEXT: br label [[IF_END:%.*]]
+; ATTRIBUTOR: if.else:
+; ATTRIBUTOR-NEXT: tail call void @cold1()
+; ATTRIBUTOR-NEXT: br label [[IF_END]]
+; ATTRIBUTOR: if.end:
+; ATTRIBUTOR-NEXT: ret void
+;
+entry:
+ %tobool.not = icmp eq i32 %x, 0
+ br i1 %tobool.not, label %if.else, label %if.then
+
+if.then:
+ tail call void @cold0()
+ br label %if.end
+
+if.else:
+ tail call void @cold1()
+ br label %if.end
+
+if.end:
+ ret void
+}
+
+define dso_local void @test_exit(i32 noundef %x) {
+; FNATTRS: Function Attrs: cold
+; FNATTRS-LABEL: define dso_local void @test_exit
+; FNATTRS-SAME: (i32 noundef [[X:%.*]]) #[[ATTR0]] {
+; FNATTRS-NEXT: entry:
+; FNATTRS-NEXT: tail call void @not_cold0()
+; FNATTRS-NEXT: [[TOBOOL_NOT:%.*]] = icmp eq i32 [[X]], 0
+; FNATTRS-NEXT: br i1 [[TOBOOL_NOT]], label [[IF_ELSE:%.*]], label [[IF_THEN:%.*]]
+; FNATTRS: if.then:
+; FNATTRS-NEXT: tail call void @not_cold1()
+; FNATTRS-NEXT: br label [[IF_END:%.*]]
+; FNATTRS: if.else:
+; FNATTRS-NEXT: tail call void @not_cold2()
+; FNATTRS-NEXT: br label [[IF_END]]
+; FNATTRS: if.end:
+; FNATTRS-NEXT: tail call void @cold0()
+; FNATTRS-NEXT: ret void
+;
+; ATTRIBUTOR-LABEL: define dso_local void @test_exit
+; ATTRIBUTOR-SAME: (i32 noundef [[X:%.*]]) {
+; ATTRIBUTOR-NEXT: entry:
+; ATTRIBUTOR-NEXT: tail call void @not_cold0()
+; ATTRIBUTOR-NEXT: [[TOBOOL_NOT:%.*]] = icmp eq i32 [[X]], 0
+; ATTRIBUTOR-NEXT: br i1 [[TOBOOL_NOT]], label [[IF_ELSE:%.*]], label [[IF_THEN:%.*]]
+; ATTRIBUTOR: if.then:
+; ATTRIBUTOR-NEXT: tail call void @not_cold1()
+; ATTRIBUTOR-NEXT: br label [[IF_END:%.*]]
+; ATTRIBUTOR: if.else:
+; ATTRIBUTOR-NEXT: tail call void @not_cold2()
+; ATTRIBUTOR-NEXT: br label [[IF_END]]
+; ATTRIBUTOR: if.end:
+; ATTRIBUTOR-NEXT: tail call void @cold0()
+; ATTRIBUTOR-NEXT: ret void
+;
+entry:
+ tail call void @not_cold0()
+ %tobool.not = icmp eq i32 %x, 0
+ br i1 %tobool.not, label %if.else, label %if.then
+
+if.then:
+ tail call void @not_cold1()
+ br label %if.end
+
+if.else:
+ tail call void @not_cold2()
+ br label %if.end
+
+if.end:
+ tail call void @cold0()
+ ret void
+}
+
+define dso_local void @test_complex(i32 noundef %x) {
+; FNATTRS: Function Attrs: cold
+; FNATTRS-LABEL: define dso_local void @test_complex
+; FNATTRS-SAME: (i32 noundef [[X:%.*]]) #[[ATTR0]] {
+; FNATTRS-NEXT: entry:
+; FNATTRS-NEXT: tail call void @not_cold0()
+; FNATTRS-NEXT: [[TOBOOL_NOT:%.*]] = icmp eq i32 [[X]], 0
+; FNATTRS-NEXT: br i1 [[TOBOOL_NOT]], label [[IF_ELSE11:%.*]], label [[IF_THEN:%.*]]
+; FNATTRS: if.then:
+; FNATTRS-NEXT: [[CALL:%.*]] = tail call i32 @get_val()
+; FNATTRS-NEXT: [[TOBOOL1_NOT:%.*]] = icmp eq i32 [[CALL]], 0
+; FNATTRS-NEXT: br i1 [[TOBOOL1_NOT]], label [[IF_ELSE:%.*]], label [[IF_THEN2:%.*]]
+; FNATTRS: if.then2:
+; FNATTRS-NEXT: tail call void @cold1()
+; FNATTRS-NEXT: br label [[IF_END12:%.*]]
+; FNATTRS: if.else:
+; FNATTRS-NEXT: [[CALL3:%.*]] = tail call i32 @get_val()
+; FNATTRS-NEXT: [[TOBOOL4_NOT:%.*]] = icmp eq i32 [[CALL3]], 0
+; FNATTRS-NEXT: br i1 [[TOBOOL4_NOT]], label [[IF_ELSE6:%.*]], label [[IF_THEN5:%.*]]
+; FNATTRS: if.then5:
+; FNATTRS-NEXT: tail call void @cold0()
+; FNATTRS-NEXT: br label [[IF_END12]]
+; FNATTRS: if.else6:
+; FNATTRS-NEXT: tail call void @not_cold0()
+; FNATTRS-NEXT: [[CALL7:%.*]] = tail call i32 @get_val()
+; FNATTRS-NEXT: switch i32 [[CALL7]], label [[SW_DEFAULT:%.*]] [
+; FNATTRS-NEXT: i32 0, label [[SW_BB:%.*]]
+; FNATTRS-NEXT: i32 1, label [[SW_BB8:%.*]]
+; FNATTRS-NEXT: i32 2, label [[SW_BB9:%.*]]
+; FNATTRS-NEXT: ]
+; FNATTRS: sw.bb:
+; FNATTRS-NEXT: tail call void @not_cold0()
+; FNATTRS-NEXT: br label [[CALL_COLD:%.*]]
+; FNATTRS: sw.bb8:
+; FNATTRS-NEXT: tail call void @not_cold1()
+; FNATTRS-NEXT: br label [[CALL_COLD]]
+; FNATTRS: sw.bb9:
+; FNATTRS-NEXT: tail call void @not_cold2()
+; FNATTRS-NEXT: br label [[CALL_COLD]]
+; FNATTRS: sw.default:
+; FNATTRS-NEXT: tail call void @cold0()
+; FNATTRS-NEXT: br label [[IF_END12]]
+; FNATTRS: call_cold:
+; FNATTRS-NEXT: tail call void @cold_at_cb() #[[ATTR0]]
+; FNATTRS-NEXT: br label [[IF_END12]]
+; FNATTRS: if.else11:
+; FNATTRS-NEXT: tail call void @cold0()
+; FNATTRS-NEXT: br label [[IF_END12]]
+; FNATTRS: if.end12:
+; FNATTRS-NEXT: ret void
+;
+; ATTRIBUTOR-LABEL: define dso_local void @test_complex
+; ATTRIBUTOR-SAME: (i32 noundef [[X:%.*]]) {
+; ATTRIBUTOR-NEXT: entry:
+; ATTRIBUTOR-NEXT: tail call void @not_cold0()
+; ATTRIBUTOR-NEXT: [[TOBOOL_NOT:%.*]] = icmp eq i32 [[X]], 0
+; ATTRIBUTOR-NEXT: br i1 [[TOBOOL_NOT]], label [[IF_ELSE11:%.*]], label [[IF_THEN:%.*]]
+; ATTRIBUTOR: if.then:
+; ATTRIBUTOR-NEXT: [[CALL:%.*]] = tail call i32 @get_val()
+; ATTRIBUTOR-NEXT: [[TOBOOL1_NOT:%.*]] = icmp eq i32 [[CALL]], 0
+; ATTRIBUTOR-NEXT: br i1 [[TOBOOL1_NOT]], label [[IF_ELSE:%.*]], label [[IF_THEN2:%.*]]
+; ATTRIBUTOR: if.then2:
+; ATTRIBUTOR-NEXT: tail call void @cold1()
+; ATTRIBUTOR-NEXT: br label [[IF_END12:%.*]]
+; ATTRIBUTOR: if.else:
+; ATTRIBUTOR-NEXT: [[CALL3:%.*]] = tail call i32 @get_val()
+; ATTRIBUTOR-NEXT: [[TOBOOL4_NOT:%.*]] = icmp eq i32 [[CALL3]], 0
+; ATTRIBUTOR-NEXT: br i1 [[TOBOOL4_NOT]], label [[IF_ELSE6:%.*]], label [[IF_THEN5:%.*]]
+; ATTRIBUTOR: if.then5:
+; ATTRIBUTOR-NEXT: tail call void @cold0()
+; ATTRIBUTOR-NEXT: br label [[IF_END12]]
+; ATTRIBUTOR: if.else6:
+; ATTRIBUTOR-NEXT: tail call void @not_cold0()
+; ATTRIBUTOR-NEXT: [[CALL7:%.*]] = tail call i32 @get_val()
+; ATTRIBUTOR-NEXT: switch i32 [[CALL7]], label [[SW_DEFAULT:%.*]] [
+; ATTRIBUTOR-NEXT: i32 0, label [[SW_BB:%.*]]
+; ATTRIBUTOR-NEXT: i32 1, label [[SW_BB8:%.*]]
+; ATTRIBUTOR-NEXT: i32 2, label [[SW_BB9:%.*]]
+; ATTRIBUTOR-NEXT: ]
+; ATTRIBUTOR: sw.bb:
+; ATTRIBUTOR-NEXT: tail call void @not_cold0()
+; ATTRIBUTOR-NEXT: br label [[CALL_COLD:%.*]]
+; ATTRIBUTOR: sw.bb8:
+; ATTRIBUTOR-NEXT: tail call void @not_cold1()
+; ATTRIBUTOR-NEXT: br label [[CALL_COLD]]
+; ATTRIBUTOR: sw.bb9:
+; ATTRIBUTOR-NEXT: tail call void @not_cold2()
+; ATTRIBUTOR-NEXT: br label [[CALL_COLD]]
+; ATTRIBUTOR: sw.default:
+; ATTRIBUTOR-NEXT: tail call void @cold0()
+; ATTRIBUTOR-NEXT: br label [[IF_END12]]
+; ATTRIBUTOR: call_cold:
+; ATTRIBUTOR-NEXT: tail call void @cold_at_cb() #[[ATTR0:[0-9]+]]
+; ATTRIBUTOR-NEXT: br label [[IF_END12]]
+; ATTRIBUTOR: if.else11:
+; ATTRIBUTOR-NEXT: tail call void @cold0()
+; ATTRIBUTOR-NEXT: br label [[IF_END12]]
+; ATTRIBUTOR: if.end12:
+; ATTRIBUTOR-NEXT: ret void
+;
+entry:
+ tail call void @not_cold0()
+ %tobool.not = icmp eq i32 %x, 0
+ br i1 %tobool.not, label %if.else11, label %if.then
+
+if.then:
+ %call = tail call i32 @get_val()
+ %tobool1.not = icmp eq i32 %call, 0
+ br i1 %tobool1.not, label %if.else, label %if.then2
+
+if.then2:
+ tail call void @cold1()
+ br label %if.end12
+
+if.else:
+ %call3 = tail call i32 @get_val()
+ %tobool4.not = icmp eq i32 %call3, 0
+ br i1 %tobool4.not, label %if.else6, label %if.then5
+
+if.then5:
+ tail call void @cold0()
+ br label %if.end12
+
+if.else6:
+ tail call void @not_cold0()
+ %call7 = tail call i32 @get_val()
+ switch i32 %call7, label %sw.default [
+ i32 0, label %sw.bb
+ i32 1, label %sw.bb8
+ i32 2, label %sw.bb9
+ ]
+
+sw.bb:
+ tail call void @not_cold0()
+ br label %call_cold
+
+sw.bb8:
+ tail call void @not_cold1()
+ br label %call_cold
+
+sw.bb9:
+ tail call void @not_cold2()
+ br label %call_cold
+
+sw.default:
+ tail call void @cold0()
+ br label %if.end12
+
+call_cold:
+ tail call void @cold_at_cb() cold
+ br label %if.end12
+
+if.else11:
+ tail call void @cold0()
+ br label %if.end12
+
+if.end12:
+ ret void
+}
+
+define dso_local void @test_complex2(i32 noundef %x) {
+; FNATTRS: Function Attrs: cold
+; FNATTRS-LABEL: define dso_local void @test_complex2
+; FNATTRS-SAME: (i32 noundef [[X:%.*]]) #[[ATTR0]] {
+; FNATTRS-NEXT: entry:
+; FNATTRS-NEXT: tail call void @not_cold0()
+; FNATTRS-NEXT: [[TOBOOL_NOT:%.*]] = icmp eq i32 [[X]], 0
+; FNATTRS-NEXT: [[CALL12:%.*]] = tail call i32 @get_val()
+; FNATTRS-NEXT: br i1 [[TOBOOL_NOT]], label [[IF_ELSE11:%.*]], label [[IF_THEN:%.*]]
+; FNATTRS: if.then:
+; FNATTRS-NEXT: [[TOBOOL1_NOT:%.*]] = icmp eq i32 [[CALL12]], 0
+; FNATTRS-NEXT: br i1 [[TOBOOL1_NOT]], label [[IF_ELSE:%.*]], label [[IF_THEN2:%.*]]
+; FNATTRS: if.then2:
+; FNATTRS-NEXT: tail call void @cold1()
+; FNATTRS-NEXT: br label [[IF_END16:%.*]]
+; FNATTRS: if.else:
+; FNATTRS-NEXT: [[CALL3:%.*]] = tail call i32 @get_val()
+; FNATTRS-NEXT: [[TOBOOL4_NOT:%.*]] = icmp eq i32 [[CALL3]], 0
+; FNATTRS-NEXT: br i1 [[TOBOOL4_NOT]], label [[IF_ELSE6:%.*]], label [[IF_THEN5:%.*]]
+; FNATTRS: if.then5:
+; FNATTRS-NEXT: tail call void @cold0()
+; FNATTRS-NEXT: br label [[IF_END16]]
+; FNATTRS: if.else6:
+; FNATTRS-NEXT: tail call void @not_cold0()
+; FNATTRS-NEXT: [[CALL7:%.*]] = tail call i32 @get_val()
+; FNATTRS-NEXT: switch i32 [[CALL7]], label [[SW_DEFAULT:%.*]] [
+; FNATTRS-NEXT: i32 0, label [[SW_BB:%.*]]
+; FNATTRS-NEXT: i32 1, label [[SW_BB8:%.*]]
+; FNATTRS-NEXT: i32 2, label [[SW_BB9:%.*]]
+; FNATTRS-NEXT: ]
+; FNATTRS: sw.bb:
+; FNATTRS-NEXT: tail call void @not_cold0()
+; FNATTRS-NEXT: br label [[CALL_COLD:%.*]]
+; FNATTRS: sw.bb8:
+; FNATTRS-NEXT: tail call void @not_cold1()
+; FNATTRS-NEXT: br label [[CALL_COLD]]
+; FNATTRS: sw.bb9:
+; FNATTRS-NEXT: tail call void @not_cold2(...
[truncated]
``````````
</details>
https://github.com/llvm/llvm-project/pull/101298
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