d2a895a972
Using TargetTransformInfo allows the splitting pass to factor in the code size cost of instructions as it decides whether or not outlining is profitable. This did not regress the overall amount of outlining seen on the handful of internal frameworks I tested. Thanks to Jun Bum Lim for suggesting this! Differential Revision: https://reviews.llvm.org/D53835 llvm-svn: 346108
106 lines
3.1 KiB
LLVM
106 lines
3.1 KiB
LLVM
; RUN: opt -hotcoldsplit -S < %s | FileCheck %s
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; RUN: opt -passes=hotcoldsplit -S < %s | FileCheck %s
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-macosx10.14.0"
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; Check that these functions are not split. Outlined functions are called from a
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; basic block named codeRepl.
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; The cold region is too small to split.
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; CHECK-LABEL: @foo
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; CHECK-NOT: foo.cold.1
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define void @foo() {
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entry:
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br i1 undef, label %if.then, label %if.end
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if.then: ; preds = %entry
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unreachable
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if.end: ; preds = %entry
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ret void
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}
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; The cold region is still too small to split.
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; CHECK-LABEL: @bar
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; CHECK-NOT: bar.cold.1
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define void @bar() {
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entry:
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br i1 undef, label %if.then, label %if.end
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if.then: ; preds = %entry
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call void @sink()
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call void @sink()
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ret void
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if.end: ; preds = %entry
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ret void
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}
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; Make sure we don't try to outline the entire function.
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; CHECK-LABEL: @fun
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; CHECK-NOT: fun.cold.1
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define void @fun() {
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entry:
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br i1 undef, label %if.then, label %if.end
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if.then: ; preds = %entry
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br label %if.end
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if.end: ; preds = %entry
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ret void
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}
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; Don't outline infinite loops.
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; CHECK-LABEL: @infinite_loop
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; CHECK-NOT: infinite_loop.cold.1
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define void @infinite_loop() {
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entry:
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br label %loop
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loop:
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call void @sink()
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call void @sink()
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call void @sink()
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br label %loop
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}
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; Don't count debug intrinsics towards the outlining threshold.
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; CHECK-LABEL: @dont_count_debug_intrinsics
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; CHECK-NOT: dont_count_debug_intrinsics.cold.1
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define void @dont_count_debug_intrinsics(i32 %arg1) !dbg !6 {
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entry:
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%var = add i32 0, 0, !dbg !11
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br i1 undef, label %if.then, label %if.end
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if.then: ; preds = %entry
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ret void
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if.end: ; preds = %entry
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call void @llvm.dbg.value(metadata i32 %arg1, metadata !9, metadata !DIExpression()), !dbg !11
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call void @llvm.dbg.value(metadata i32 %arg1, metadata !9, metadata !DIExpression()), !dbg !11
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call void @sink()
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ret void
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}
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declare void @llvm.dbg.value(metadata, metadata, metadata)
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declare void @sink() cold
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!llvm.dbg.cu = !{!0}
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!llvm.debugify = !{!3, !4}
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!llvm.module.flags = !{!5}
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!0 = distinct !DICompileUnit(language: DW_LANG_C, file: !1, producer: "debugify", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "<stdin>", directory: "/")
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!2 = !{}
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!3 = !{i32 7}
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!4 = !{i32 1}
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!5 = !{i32 2, !"Debug Info Version", i32 3}
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!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)
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!7 = !DISubroutineType(types: !2)
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!8 = !{!9}
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!9 = !DILocalVariable(name: "1", scope: !6, file: !1, line: 1, type: !10)
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!10 = !DIBasicType(name: "ty32", size: 32, encoding: DW_ATE_unsigned)
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!11 = !DILocation(line: 1, column: 1, scope: !6)
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