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43ee82f217
Enable multiple COPY hints to eliminate more COPYs during register allocation. Note that this is something all targets should do, see https://reviews.llvm.org/D38128. Review: Yonghong Song llvm-svn: 325457
107 lines
2.8 KiB
LLVM
107 lines
2.8 KiB
LLVM
; RUN: llc < %s -march=bpf -verify-machineinstrs | FileCheck %s
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; Source code:
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; struct xdp_md {
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; unsigned data;
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; unsigned data_end;
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; };
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;
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; int gbl;
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; int xdp_dummy(struct xdp_md *xdp)
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; {
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; char tmp;
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; long addr;
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;
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; if (gbl) {
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; long addr1 = (long)xdp->data;
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; tmp = *(char *)addr1;
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; if (tmp == 1)
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; return 3;
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; } else {
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; tmp = *(volatile char *)(long)xdp->data_end;
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; if (tmp == 1)
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; return 2;
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; }
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; addr = (long)xdp->data;
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; tmp = *(volatile char *)addr;
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; if (tmp == 0)
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; return 1;
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; return 0;
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; }
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;
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; unsigned int rol32(unsigned int word, unsigned int shift)
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; {
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; return (word << shift) | (word >> ((-shift) & 31));
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; }
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%struct.xdp_md = type { i32, i32 }
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@gbl = common local_unnamed_addr global i32 0, align 4
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; Function Attrs: norecurse nounwind
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define i32 @xdp_dummy(%struct.xdp_md* nocapture readonly) local_unnamed_addr #0 {
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%2 = load i32, i32* @gbl, align 4
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%3 = icmp eq i32 %2, 0
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br i1 %3, label %11, label %4
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; <label>:4: ; preds = %1
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%5 = getelementptr inbounds %struct.xdp_md, %struct.xdp_md* %0, i64 0, i32 0
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%6 = load i32, i32* %5, align 4
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%7 = zext i32 %6 to i64
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%8 = inttoptr i64 %7 to i8*
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%9 = load i8, i8* %8, align 1
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%10 = icmp eq i8 %9, 1
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br i1 %10, label %28, label %23
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; CHECK: r1 = *(u32 *)(r1 + 0)
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; CHECK: r2 = *(u8 *)(r1 + 0)
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; <label>:11: ; preds = %1
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%12 = getelementptr inbounds %struct.xdp_md, %struct.xdp_md* %0, i64 0, i32 1
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%13 = load i32, i32* %12, align 4
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%14 = zext i32 %13 to i64
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; CHECK: r2 = *(u32 *)(r1 + 4)
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%15 = inttoptr i64 %14 to i8*
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%16 = load volatile i8, i8* %15, align 1
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; CHECK: r2 = *(u8 *)(r2 + 0)
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%17 = icmp eq i8 %16, 1
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br i1 %17, label %28, label %18
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; <label>:18: ; preds = %11
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%19 = getelementptr inbounds %struct.xdp_md, %struct.xdp_md* %0, i64 0, i32 0
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%20 = load i32, i32* %19, align 4
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%21 = zext i32 %20 to i64
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%22 = inttoptr i64 %21 to i8*
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br label %23
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; CHECK: r1 = *(u32 *)(r1 + 0)
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; <label>:23: ; preds = %18, %4
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%24 = phi i8* [ %22, %18 ], [ %8, %4 ]
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; CHECK-NOT: r1 <<= 32
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; CHECK-NOT: r1 >>= 32
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%25 = load volatile i8, i8* %24, align 1
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; CHECK: r1 = *(u8 *)(r1 + 0)
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%26 = icmp eq i8 %25, 0
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%27 = zext i1 %26 to i32
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br label %28
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; <label>:28: ; preds = %4, %23, %11
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%29 = phi i32 [ 3, %4 ], [ 2, %11 ], [ %27, %23 ]
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ret i32 %29
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}
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; Function Attrs: norecurse nounwind readnone
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define i32 @rol32(i32, i32) local_unnamed_addr #1 {
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%3 = shl i32 %0, %1
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; CHECK: r1 <<= 32
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; CHECK: r1 >>= 32
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%4 = sub i32 0, %1
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%5 = and i32 %4, 31
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%6 = lshr i32 %0, %5
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; CHECK: r0 <<= 32
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; CHECK: r0 >>= 32
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%7 = or i32 %6, %3
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ret i32 %7
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}
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attributes #0 = { norecurse nounwind }
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attributes #1 = { norecurse nounwind readnone }
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