1 files changed, 87 insertions, 0 deletions
diff --git a/test/CodeGen/BPF/remove_truncate_1.ll b/test/CodeGen/BPF/remove_truncate_1.ll
new file mode 100644
index 0000000000000..65433853b9d50
--- /dev/null
+++ b/test/CodeGen/BPF/remove_truncate_1.ll
@@ -0,0 +1,87 @@
+; RUN: llc < %s -march=bpf -verify-machineinstrs | FileCheck %s
+
+; Source code:
+; struct xdp_md {
+;   unsigned data;
+;   unsigned data_end;
+; };
+;
+; int gbl;
+; int xdp_dummy(struct xdp_md *xdp)
+; {
+;   char tmp;
+;   long addr;
+;
+;   if (gbl) {
+;     long addr1 = (long)xdp->data;
+;     tmp = *(char *)addr1;
+;     if (tmp == 1)
+;       return 3;
+;   } else {
+;     tmp = *(volatile char *)(long)xdp->data_end;
+;     if (tmp == 1)
+;       return 2;
+;   }
+;   addr = (long)xdp->data;
+;   tmp = *(volatile char *)addr;
+;   if (tmp == 0)
+;     return 1;
+;   return 0;
+; }
+
+%struct.xdp_md = type { i32, i32 }
+
+@gbl = common local_unnamed_addr global i32 0, align 4
+
+; Function Attrs: norecurse nounwind
+define i32 @xdp_dummy(%struct.xdp_md* nocapture readonly %xdp) local_unnamed_addr #0 {
+entry:
+  %0 = load i32, i32* @gbl, align 4
+  %tobool = icmp eq i32 %0, 0
+  br i1 %tobool, label %if.else, label %if.then
+
+if.then:                                          ; preds = %entry
+  %data = getelementptr inbounds %struct.xdp_md, %struct.xdp_md* %xdp, i64 0, i32 0
+  %1 = load i32, i32* %data, align 4
+  %conv = zext i32 %1 to i64
+  %2 = inttoptr i64 %conv to i8*
+  %3 = load i8, i8* %2, align 1
+  %cmp = icmp eq i8 %3, 1
+  br i1 %cmp, label %cleanup20, label %if.end12
+; CHECK:  r1 = *(u32 *)(r1 + 0)
+; CHECK:  r2 = *(u8 *)(r1 + 0)
+
+if.else:                                          ; preds = %entry
+  %data_end = getelementptr inbounds %struct.xdp_md, %struct.xdp_md* %xdp, i64 0, i32 1
+  %4 = load i32, i32* %data_end, align 4
+  %conv6 = zext i32 %4 to i64
+; CHECK:  r2 = *(u32 *)(r1 + 4)
+  %5 = inttoptr i64 %conv6 to i8*
+  %6 = load volatile i8, i8* %5, align 1
+  %cmp8 = icmp eq i8 %6, 1
+  br i1 %cmp8, label %cleanup20, label %if.else.if.end12_crit_edge
+
+if.else.if.end12_crit_edge:                       ; preds = %if.else
+  %data13.phi.trans.insert = getelementptr inbounds %struct.xdp_md, %struct.xdp_md* %xdp, i64 0, i32 0
+  %.pre = load i32, i32* %data13.phi.trans.insert, align 4
+  br label %if.end12
+; CHECK: r1 = *(u32 *)(r1 + 0)
+
+if.end12:                                         ; preds = %if.else.if.end12_crit_edge, %if.then
+  %7 = phi i32 [ %.pre, %if.else.if.end12_crit_edge ], [ %1, %if.then ]
+  %conv14 = zext i32 %7 to i64
+; CHECK-NOT: r1 <<= 32
+; CHECK-NOT: r1 >>= 32
+  %8 = inttoptr i64 %conv14 to i8*
+  %9 = load volatile i8, i8* %8, align 1
+; CHECK:  r1 = *(u8 *)(r1 + 0)
+  %cmp16 = icmp eq i8 %9, 0
+  %.28 = zext i1 %cmp16 to i32
+  br label %cleanup20
+
+cleanup20:                                        ; preds = %if.then, %if.end12, %if.else
+  %retval.1 = phi i32 [ 3, %if.then ], [ 2, %if.else ], [ %.28, %if.end12 ]
+  ret i32 %retval.1
+}
+
+attributes #0 = { norecurse nounwind }