108 lines
3.8 KiB
LLVM
108 lines
3.8 KiB
LLVM
; RUN: opt -O2 -mtriple=bpf-pc-linux -S -o - %s | FileCheck %s
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;
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; Check position of bpf-preserve-static-offset pass in the pipeline:
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; - preserve.static.offset call is preserved if address is passed as
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; a parameter to an inline-able function;
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; - second bpf-preserve-static-offset pass (after inlining) should introduce
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; getelementptr.and.load call using the preserved marker after loops
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; unrolling;
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; - readonly and tbaa attributes should allow replacement of
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; getelementptr.and.load calls by CSE transformation.
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;
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; Source:
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; #define __ctx __attribute__((preserve_static_offset))
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;
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; struct foo {
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; int a;
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; int b[4];
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; } __ctx;
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;
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; extern void consume(int);
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;
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; static inline void bar(int * restrict p) {
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; consume(p[1]);
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; }
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;
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; void quux(struct foo *p){
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; unsigned long i = 0;
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; #pragma clang loop unroll(full)
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; while (i < 2) {
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; bar(p->b);
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; ++i;
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; }
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; }
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;
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; Compilation flag:
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; clang -cc1 -O2 -triple bpf -S -emit-llvm -disable-llvm-passes -o - \
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; | opt -passes=function(sroa) -S -o -
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%struct.foo = type { i32, [4 x i32] }
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; Function Attrs: nounwind
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define dso_local void @quux(ptr noundef %p) #0 {
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entry:
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br label %while.cond
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while.cond: ; preds = %while.body, %entry
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%i.0 = phi i64 [ 0, %entry ], [ %inc, %while.body ]
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%cmp = icmp ult i64 %i.0, 2
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br i1 %cmp, label %while.body, label %while.end
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while.body: ; preds = %while.cond
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%0 = call ptr @llvm.preserve.static.offset(ptr %p)
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%b = getelementptr inbounds %struct.foo, ptr %0, i32 0, i32 1
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%arraydecay = getelementptr inbounds [4 x i32], ptr %b, i64 0, i64 0
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call void @bar(ptr noundef %arraydecay)
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%inc = add i64 %i.0, 1
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br label %while.cond, !llvm.loop !2
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while.end: ; preds = %while.cond
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ret void
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}
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; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
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declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1
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; Function Attrs: inlinehint nounwind
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define internal void @bar(ptr noalias noundef %p) #2 {
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entry:
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%arrayidx = getelementptr inbounds i32, ptr %p, i64 1
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%0 = load i32, ptr %arrayidx, align 4, !tbaa !5
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call void @consume(i32 noundef %0)
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ret void
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}
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; CHECK: define dso_local void @quux(ptr nocapture noundef readonly %[[p:.*]])
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; CHECK: %[[v1:.*]] = tail call i32 (ptr, i1, i8, i8, i8, i1, ...)
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; CHECK-SAME: @llvm.bpf.getelementptr.and.load.i32
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; CHECK-SAME: (ptr readonly elementtype(%struct.foo) %[[p]],
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; CHECK-SAME: i1 false, i8 0, i8 1, i8 2, i1 true, i64 immarg 0, i32 immarg 1, i64 immarg 1)
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; CHECK: tail call void @consume(i32 noundef %[[v1]])
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; CHECK: tail call void @consume(i32 noundef %[[v1]])
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; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
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declare ptr @llvm.preserve.static.offset(ptr readnone) #3
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; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
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declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1
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declare void @consume(i32 noundef) #4
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attributes #0 = { nounwind "no-trapping-math"="true" "stack-protector-buffer-size"="8" }
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attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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attributes #2 = { inlinehint nounwind "no-trapping-math"="true" "stack-protector-buffer-size"="8" }
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attributes #3 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }
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attributes #4 = { "no-trapping-math"="true" "stack-protector-buffer-size"="8" }
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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"}
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!2 = distinct !{!2, !3, !4}
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!3 = !{!"llvm.loop.mustprogress"}
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!4 = !{!"llvm.loop.unroll.full"}
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!5 = !{!6, !6, i64 0}
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!6 = !{!"int", !7, i64 0}
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!7 = !{!"omnipotent char", !8, i64 0}
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!8 = !{!"Simple C/C++ TBAA"}
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