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argument. The x86-64 ABI requires the incoming value of %rdi to be copied to %rax on exit from a function that is returning a large C struct. Also, add a README-X86-64 entry detailing the missed optimization opportunity and proposing an alternative approach. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50075 91177308-0d34-0410-b5e6-96231b3b80d8
55 lines
3.0 KiB
LLVM
55 lines
3.0 KiB
LLVM
; RUN: llvm-as < %s | llc | grep {movq %rdi, %rax}
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128"
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target triple = "x86_64-apple-darwin8"
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%struct.foo = type { [4 x i64] }
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define void @bar(%struct.foo* noalias sret %agg.result, %struct.foo* %d) nounwind {
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entry:
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%d_addr = alloca %struct.foo* ; <%struct.foo**> [#uses=2]
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%memtmp = alloca %struct.foo, align 8 ; <%struct.foo*> [#uses=1]
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%"alloca point" = bitcast i32 0 to i32 ; <i32> [#uses=0]
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store %struct.foo* %d, %struct.foo** %d_addr
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%tmp = load %struct.foo** %d_addr, align 8 ; <%struct.foo*> [#uses=1]
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%tmp1 = getelementptr %struct.foo* %agg.result, i32 0, i32 0 ; <[4 x i64]*> [#uses=4]
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%tmp2 = getelementptr %struct.foo* %tmp, i32 0, i32 0 ; <[4 x i64]*> [#uses=4]
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%tmp3 = getelementptr [4 x i64]* %tmp1, i32 0, i32 0 ; <i64*> [#uses=1]
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%tmp4 = getelementptr [4 x i64]* %tmp2, i32 0, i32 0 ; <i64*> [#uses=1]
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%tmp5 = load i64* %tmp4, align 8 ; <i64> [#uses=1]
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store i64 %tmp5, i64* %tmp3, align 8
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%tmp6 = getelementptr [4 x i64]* %tmp1, i32 0, i32 1 ; <i64*> [#uses=1]
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%tmp7 = getelementptr [4 x i64]* %tmp2, i32 0, i32 1 ; <i64*> [#uses=1]
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%tmp8 = load i64* %tmp7, align 8 ; <i64> [#uses=1]
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store i64 %tmp8, i64* %tmp6, align 8
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%tmp9 = getelementptr [4 x i64]* %tmp1, i32 0, i32 2 ; <i64*> [#uses=1]
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%tmp10 = getelementptr [4 x i64]* %tmp2, i32 0, i32 2 ; <i64*> [#uses=1]
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%tmp11 = load i64* %tmp10, align 8 ; <i64> [#uses=1]
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store i64 %tmp11, i64* %tmp9, align 8
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%tmp12 = getelementptr [4 x i64]* %tmp1, i32 0, i32 3 ; <i64*> [#uses=1]
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%tmp13 = getelementptr [4 x i64]* %tmp2, i32 0, i32 3 ; <i64*> [#uses=1]
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%tmp14 = load i64* %tmp13, align 8 ; <i64> [#uses=1]
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store i64 %tmp14, i64* %tmp12, align 8
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%tmp15 = getelementptr %struct.foo* %memtmp, i32 0, i32 0 ; <[4 x i64]*> [#uses=4]
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%tmp16 = getelementptr %struct.foo* %agg.result, i32 0, i32 0 ; <[4 x i64]*> [#uses=4]
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%tmp17 = getelementptr [4 x i64]* %tmp15, i32 0, i32 0 ; <i64*> [#uses=1]
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%tmp18 = getelementptr [4 x i64]* %tmp16, i32 0, i32 0 ; <i64*> [#uses=1]
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%tmp19 = load i64* %tmp18, align 8 ; <i64> [#uses=1]
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store i64 %tmp19, i64* %tmp17, align 8
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%tmp20 = getelementptr [4 x i64]* %tmp15, i32 0, i32 1 ; <i64*> [#uses=1]
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%tmp21 = getelementptr [4 x i64]* %tmp16, i32 0, i32 1 ; <i64*> [#uses=1]
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%tmp22 = load i64* %tmp21, align 8 ; <i64> [#uses=1]
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store i64 %tmp22, i64* %tmp20, align 8
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%tmp23 = getelementptr [4 x i64]* %tmp15, i32 0, i32 2 ; <i64*> [#uses=1]
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%tmp24 = getelementptr [4 x i64]* %tmp16, i32 0, i32 2 ; <i64*> [#uses=1]
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%tmp25 = load i64* %tmp24, align 8 ; <i64> [#uses=1]
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store i64 %tmp25, i64* %tmp23, align 8
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%tmp26 = getelementptr [4 x i64]* %tmp15, i32 0, i32 3 ; <i64*> [#uses=1]
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%tmp27 = getelementptr [4 x i64]* %tmp16, i32 0, i32 3 ; <i64*> [#uses=1]
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%tmp28 = load i64* %tmp27, align 8 ; <i64> [#uses=1]
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store i64 %tmp28, i64* %tmp26, align 8
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br label %return
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return: ; preds = %entry
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ret void
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}
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