3a4b351ba1
This introduces a new `ptrtoaddr` instruction which is similar to `ptrtoint` but has two differences: 1) Unlike `ptrtoint`, `ptrtoaddr` does not capture provenance 2) `ptrtoaddr` only extracts (and then extends/truncates) the low index-width bits of the pointer For most architectures, difference 2) does not matter since index (address) width and pointer representation width are the same, but this does make a difference for architectures that have pointers that aren't just plain integer addresses such as AMDGPU fat pointers or CHERI capabilities. This commit introduces textual and bitcode IR support as well as basic code generation, but optimization passes do not handle the new instruction yet so it may result in worse code than using ptrtoint. Follow-up changes will update capture tracking, etc. for the new instruction. RFC: https://discourse.llvm.org/t/clarifiying-the-semantics-of-ptrtoint/83987/54 Reviewed By: nikic Pull Request: https://github.com/llvm/llvm-project/pull/139357
28 lines
951 B
LLVM
28 lines
951 B
LLVM
; RUN: llvm-as < %s | llvm-dis | llvm-as | llvm-dis | FileCheck %s
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target datalayout = "p1:64:64:64:32"
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@i_as0 = global i32 0
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@global_cast_as0 = global i64 ptrtoaddr (ptr @i_as0 to i64)
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; CHECK: @global_cast_as0 = global i64 ptrtoaddr (ptr @i_as0 to i64)
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@i_as1 = addrspace(1) global i32 0
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@global_cast_as1 = global i32 ptrtoaddr (ptr addrspace(1) @i_as1 to i32)
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; CHECK: @global_cast_as1 = global i32 ptrtoaddr (ptr addrspace(1) @i_as1 to i32)
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define i64 @test_as0(ptr %p) {
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%addr = ptrtoaddr ptr %p to i64
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; CHECK: %addr = ptrtoaddr ptr %p to i64
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ret i64 %addr
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}
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define i32 @test_as1(ptr addrspace(1) %p) {
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%addr = ptrtoaddr ptr addrspace(1) %p to i32
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; CHECK: %addr = ptrtoaddr ptr addrspace(1) %p to i32
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ret i32 %addr
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}
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define <2 x i32> @test_vec_as1(<2 x ptr addrspace(1)> %p) {
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%addr = ptrtoaddr <2 x ptr addrspace(1)> %p to <2 x i32>
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; CHECK: %addr = ptrtoaddr <2 x ptr addrspace(1)> %p to <2 x i32>
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ret <2 x i32> %addr
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}
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