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c8bdbc6d01
This works around the limitation that PTX does not allow .param space loads/stores with arbitrary pointers. If a function has a by-val struct ptr arg, say foo(%struct.x *byval %d), then add the following instructions to the first basic block : %temp = alloca %struct.x, align 8 %tt1 = bitcast %struct.x * %d to i8 * %tt2 = llvm.nvvm.cvt.gen.to.param %tt2 %tempd = bitcast i8 addrspace(101) * to %struct.x addrspace(101) * %tv = load %struct.x addrspace(101) * %tempd store %struct.x %tv, %struct.x * %temp, align 8 The above code allocates some space in the stack and copies the incoming struct from param space to local space. Then replace all occurences of %d by %temp. Fixes PR21465. llvm-svn: 221377
25 lines
1.0 KiB
LLVM
25 lines
1.0 KiB
LLVM
; RUN: opt < %s -nvptx-lower-struct-args -S | FileCheck %s
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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-v16:16:16-v32:32:32-v64:64:64-v128:128:128-n16:32:64"
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target triple = "nvptx64-unknown-unknown"
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%struct.S = type { i32, i32 }
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; Function Attrs: nounwind
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define void @_Z11TakesStruct1SPi(%struct.S* byval nocapture readonly %input, i32* nocapture %output) #0 {
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entry:
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; CHECK-LABEL @_Z22TakesStruct1SPi
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; CHECK: bitcast %struct.S* %input to i8*
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; CHECK: call i8 addrspace(101)* @llvm.nvvm.ptr.gen.to.param.p101i8.p0i8
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%b = getelementptr inbounds %struct.S* %input, i64 0, i32 1
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%0 = load i32* %b, align 4
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store i32 %0, i32* %output, align 4
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ret void
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}
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attributes #0 = { nounwind "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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!nvvm.annotations = !{!0}
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!0 = metadata !{void (%struct.S*, i32*)* @_Z11TakesStruct1SPi, metadata !"kernel", i32 1}
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