140 lines
5.4 KiB
LLVM
140 lines
5.4 KiB
LLVM
; RUN: opt -O2 -S < %s | FileCheck %s
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;
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; This test tries to ensure that simplifycfg hoisting common instructions
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; of then/else branch indeed happens. BPF target has added an IR pass
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; before loop optimizations as Commit 1d51dc38d89b
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; ([SimplifyCFG][LoopRotate] SimplifyCFG: disable common instruction
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; hoisting by default, enable late in pipeline)
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; disabled common instruction hoisting. Due to optimization triggered
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; code changes, later SimplifyCFG may not be able to perform optimization
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; even common inst hoisting is enabled.
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;
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; Source:
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; typedef struct {
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; void *f_back;
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; } FrameData;
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; extern int get_data(void *, void *);
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; extern void get_frame_ptr(void *);
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; int test() {
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; void *frame_ptr;
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; FrameData frame;
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;
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; get_frame_ptr(&frame_ptr);
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;
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; #pragma nounroll
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; for (int i = 0; i < 6; i++) {
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; if (frame_ptr && get_data(frame_ptr, &frame)) {
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; frame_ptr = frame.f_back;
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; }
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; }
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; return frame_ptr == 0;
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; }
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; Compilation flag:
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; clang -target bpf -O2 -Xclang -disable-llvm-passes -S -emit-llvm t.c -o t.ll
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target datalayout = "e-m:e-p:64:64-i64:64-i128:128-n32:64-S128"
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target triple = "bpf"
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%struct.FrameData = type { i8* }
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; Function Attrs: nounwind
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define dso_local i32 @test() #0 {
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entry:
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%frame_ptr = alloca i8*, align 8
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%frame = alloca %struct.FrameData, align 8
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%i = alloca i32, align 4
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%0 = bitcast i8** %frame_ptr to i8*
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call void @llvm.lifetime.start.p0i8(i64 8, i8* %0) #3
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%1 = bitcast %struct.FrameData* %frame to i8*
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call void @llvm.lifetime.start.p0i8(i64 8, i8* %1) #3
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%2 = bitcast i8** %frame_ptr to i8*
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call void @get_frame_ptr(i8* %2)
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%3 = bitcast i32* %i to i8*
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call void @llvm.lifetime.start.p0i8(i64 4, i8* %3) #3
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store i32 0, i32* %i, align 4, !tbaa !2
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br label %for.cond
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; CHECK-LABEL: entry
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; CHECK: %{{[0-9]+}} = load i8*, i8** %frame_ptr, align 8
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; CHECK: %{{[0-9a-z.]+}} = icmp eq i8* %2, null
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; CHECK: br label
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for.cond: ; preds = %for.inc, %entry
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%4 = load i32, i32* %i, align 4, !tbaa !2
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%cmp = icmp slt i32 %4, 6
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br i1 %cmp, label %for.body, label %for.cond.cleanup
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for.cond.cleanup: ; preds = %for.cond
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%5 = bitcast i32* %i to i8*
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call void @llvm.lifetime.end.p0i8(i64 4, i8* %5) #3
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br label %for.end
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for.body: ; preds = %for.cond
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%6 = load i8*, i8** %frame_ptr, align 8, !tbaa !6
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%tobool = icmp ne i8* %6, null
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br i1 %tobool, label %land.lhs.true, label %if.end
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land.lhs.true: ; preds = %for.body
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%7 = load i8*, i8** %frame_ptr, align 8, !tbaa !6
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%8 = bitcast %struct.FrameData* %frame to i8*
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%call = call i32 @get_data(i8* %7, i8* %8)
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%tobool1 = icmp ne i32 %call, 0
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br i1 %tobool1, label %if.then, label %if.end
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if.then: ; preds = %land.lhs.true
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%f_back = getelementptr inbounds %struct.FrameData, %struct.FrameData* %frame, i32 0, i32 0
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%9 = load i8*, i8** %f_back, align 8, !tbaa !8
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store i8* %9, i8** %frame_ptr, align 8, !tbaa !6
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br label %if.end
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if.end: ; preds = %if.then, %land.lhs.true, %for.body
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br label %for.inc
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for.inc: ; preds = %if.end
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%10 = load i32, i32* %i, align 4, !tbaa !2
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%inc = add nsw i32 %10, 1
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store i32 %inc, i32* %i, align 4, !tbaa !2
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br label %for.cond, !llvm.loop !10
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for.end: ; preds = %for.cond.cleanup
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%11 = load i8*, i8** %frame_ptr, align 8, !tbaa !6
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%cmp2 = icmp eq i8* %11, null
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%conv = zext i1 %cmp2 to i32
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%12 = bitcast %struct.FrameData* %frame to i8*
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call void @llvm.lifetime.end.p0i8(i64 8, i8* %12) #3
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%13 = bitcast i8** %frame_ptr to i8*
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call void @llvm.lifetime.end.p0i8(i64 8, i8* %13) #3
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ret i32 %conv
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}
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; Function Attrs: argmemonly nounwind willreturn
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declare void @llvm.lifetime.start.p0i8(i64 immarg, i8* nocapture) #1
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declare dso_local void @get_frame_ptr(i8*) #2
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declare dso_local i32 @get_data(i8*, i8*) #2
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; Function Attrs: argmemonly nounwind willreturn
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declare void @llvm.lifetime.end.p0i8(i64 immarg, i8* nocapture) #1
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attributes #0 = { nounwind "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "frame-pointer"="all" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #1 = { argmemonly nounwind willreturn }
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attributes #2 = { "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "frame-pointer"="all" "less-precise-fpmad"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #3 = { nounwind }
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!llvm.module.flags = !{!0}
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!llvm.ident = !{!1}
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!0 = !{i32 1, !"wchar_size", i32 4}
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!1 = !{!"clang version 12.0.0 (https://github.com/llvm/llvm-project.git 1b3c1c543269da36ae41ab84f646cf98d2e5b1e5)"}
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!2 = !{!3, !3, i64 0}
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!3 = !{!"int", !4, i64 0}
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!4 = !{!"omnipotent char", !5, i64 0}
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!5 = !{!"Simple C/C++ TBAA"}
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!6 = !{!7, !7, i64 0}
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!7 = !{!"any pointer", !4, i64 0}
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!8 = !{!9, !7, i64 0}
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!9 = !{!"", !7, i64 0}
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!10 = distinct !{!10, !11}
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!11 = !{!"llvm.loop.unroll.disable"}
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