[HotColdSplit] Simplify tests by lowering their splitting thresholds

This gets rid of the brittle/mysterious calls to @sink()/@sideeffect()
peppered throughout the test cases. They are no longer needed to force
splitting to occur.

llvm-svn: 351480

1 files changed, 101 insertions, 0 deletions

diff --git a/llvm/test/Transforms/HotColdSplit/X86/do-not-split.ll b/llvm/test/Transforms/HotColdSplit/X86/do-not-split.ll
new file mode 100644
index 00000000000..8622f03b2ed
--- /dev/null
+++ b/llvm/test/Transforms/HotColdSplit/X86/do-not-split.ll
@@ -0,0 +1,101 @@
+; RUN: opt -hotcoldsplit -hotcoldsplit-threshold=2 -S < %s | FileCheck %s
+
+target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-apple-macosx10.14.0"
+
+; Check that these functions are not split. Outlined functions are called from a
+; basic block named codeRepl.
+
+; The cold region is too small to split.
+; CHECK-LABEL: @foo
+; CHECK-NOT: foo.cold.1
+define void @foo() {
+entry:
+  br i1 undef, label %if.then, label %if.end
+
+if.then:                                          ; preds = %entry
+  unreachable
+
+if.end:                                           ; preds = %entry
+  ret void
+}
+
+; The cold region is still too small to split.
+; CHECK-LABEL: @bar
+; CHECK-NOT: bar.cold.1
+define void @bar() {
+entry:
+  br i1 undef, label %if.then, label %if.end
+
+if.then:                                          ; preds = %entry
+  call void @sink()
+  ret void
+
+if.end:                                           ; preds = %entry
+  ret void
+}
+
+; Make sure we don't try to outline the entire function.
+; CHECK-LABEL: @fun
+; CHECK-NOT: fun.cold.1
+define void @fun() {
+entry:
+  br i1 undef, label %if.then, label %if.end
+
+if.then:                                          ; preds = %entry
+  br label %if.end
+
+if.end:                                           ; preds = %entry
+  ret void
+}
+
+; Don't outline infinite loops.
+; CHECK-LABEL: @infinite_loop
+; CHECK-NOT: infinite_loop.cold.1
+define void @infinite_loop() {
+entry:
+  br label %loop
+
+loop:
+  call void @sink()
+  br label %loop
+}
+
+; Don't count debug intrinsics towards the outlining threshold.
+; CHECK-LABEL: @dont_count_debug_intrinsics
+; CHECK-NOT: dont_count_debug_intrinsics.cold.1
+define void @dont_count_debug_intrinsics(i32 %arg1) !dbg !6 {
+entry:
+  %var = add i32 0, 0, !dbg !11
+  br i1 undef, label %if.then, label %if.end
+
+if.then:                                          ; preds = %entry
+  ret void
+
+if.end:                                           ; preds = %entry
+  call void @llvm.dbg.value(metadata i32 %arg1, metadata !9, metadata !DIExpression()), !dbg !11
+  call void @llvm.dbg.value(metadata i32 %arg1, metadata !9, metadata !DIExpression()), !dbg !11
+  call void @sink()
+  ret void
+}
+
+declare void @llvm.dbg.value(metadata, metadata, metadata)
+
+declare void @sink() cold
+
+!llvm.dbg.cu = !{!0}
+!llvm.debugify = !{!3, !4}
+!llvm.module.flags = !{!5}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C, file: !1, producer: "debugify", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
+!1 = !DIFile(filename: "<stdin>", directory: "/")
+!2 = !{}
+!3 = !{i32 7}
+!4 = !{i32 1}
+!5 = !{i32 2, !"Debug Info Version", i32 3}
+!6 = distinct !DISubprogram(name: "dont_count_debug_intrinsics", linkageName: "dont_count_debug_intrinsics", scope: null, file: !1, line: 1, type: !7, isLocal: false, isDefinition: true, scopeLine: 1, isOptimized: true, unit: !0, retainedNodes: !8)
+!7 = !DISubroutineType(types: !2)
+!8 = !{!9}
+!9 = !DILocalVariable(name: "1", scope: !6, file: !1, line: 1, type: !10)
+!10 = !DIBasicType(name: "ty32", size: 32, encoding: DW_ATE_unsigned)
+!11 = !DILocation(line: 1, column: 1, scope: !6)