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1; RUN: opt -O2 -mtriple=bpf-pc-linux -S -o - %s | FileCheck %s2;3; Check position of bpf-preserve-static-offset pass in the pipeline:4; preserve.static.offset call should be preserved long enough to allow5; introduction of getelementptr.and.load after loops unrolling.6;7; Source:8; #define __ctx __attribute__((preserve_static_offset))9; 10; struct foo {11; int a;12; int b[4];13; } __ctx;14; 15; extern void consume(int);16; 17; void bar(struct foo *p){18; unsigned long i = 0;19; #pragma clang loop unroll(full)20; while (i < 2)21; consume(p->b[i++]);22; }23;24; Compilation flag:25; clang -cc1 -O2 -triple bpf -S -emit-llvm -disable-llvm-passes -o - \26; | opt -passes=function(sroa) -S -o -27 28%struct.foo = type { i32, [4 x i32] }29 30; Function Attrs: nounwind31define dso_local void @bar(ptr noundef %p) #0 {32entry:33 br label %while.cond34 35while.cond: ; preds = %while.body, %entry36 %i.0 = phi i64 [ 0, %entry ], [ %inc, %while.body ]37 %cmp = icmp ult i64 %i.0, 238 br i1 %cmp, label %while.body, label %while.end39 40while.body: ; preds = %while.cond41 %0 = call ptr @llvm.preserve.static.offset(ptr %p)42 %b = getelementptr inbounds %struct.foo, ptr %0, i32 0, i32 143 %inc = add i64 %i.0, 144 %arrayidx = getelementptr inbounds [4 x i32], ptr %b, i64 0, i64 %i.045 %1 = load i32, ptr %arrayidx, align 4, !tbaa !246 call void @consume(i32 noundef %1)47 br label %while.cond, !llvm.loop !648 49while.end: ; preds = %while.cond50 ret void51}52 53; CHECK: define dso_local void @bar(ptr noundef readonly captures(none) %[[p:.*]])54; CHECK: %[[v1:.*]] = tail call i32 (ptr, i1, i8, i8, i8, i1, ...)55; CHECK-SAME: @llvm.bpf.getelementptr.and.load.i3256; CHECK-SAME: (ptr readonly elementtype(i8) %[[p]],57; CHECK-SAME: i1 false, i8 0, i8 1, i8 2, i1 true, i64 immarg 4)58; CHECK-SAME: #[[attrs:.*]], !tbaa59; CHECK-NEXT: tail call void @consume(i32 noundef %[[v1]])60; CHECK-NEXT: %[[v2:.*]] = tail call i32 (ptr, i1, i8, i8, i8, i1, ...)61; CHECK-SAME: @llvm.bpf.getelementptr.and.load.i3262; CHECK-SAME: (ptr readonly elementtype(i8) %[[p]],63; CHECK-SAME: i1 false, i8 0, i8 1, i8 2, i1 true, i64 immarg 8)64; CHECK-SAME: #[[attrs]], !tbaa65; CHECK-NEXT: tail call void @consume(i32 noundef %[[v2]])66; CHECK: attributes #[[attrs]] = { memory(argmem: read) }67 68; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)69declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #170 71declare void @consume(i32 noundef) #272 73; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)74declare ptr @llvm.preserve.static.offset(ptr readnone) #375 76; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)77declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #178 79attributes #0 = { nounwind "no-trapping-math"="true" "stack-protector-buffer-size"="8" }80attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }81attributes #2 = { "no-trapping-math"="true" "stack-protector-buffer-size"="8" }82attributes #3 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }83 84!llvm.module.flags = !{!0}85!llvm.ident = !{!1}86 87!0 = !{i32 1, !"wchar_size", i32 4}88!1 = !{!"clang"}89!2 = !{!3, !3, i64 0}90!3 = !{!"int", !4, i64 0}91!4 = !{!"omnipotent char", !5, i64 0}92!5 = !{!"Simple C/C++ TBAA"}93!6 = distinct !{!6, !7, !8}94!7 = !{!"llvm.loop.mustprogress"}95!8 = !{!"llvm.loop.unroll.full"}96