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
57 lines
3.6 KiB
LLVM
57 lines
3.6 KiB
LLVM
;; Check all requirements on the ptrtoaddr constant expression operands
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;; Most of these invalid cases are detected at parse time but some are only
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;; detected at verification time (see Verifier::visitPtrToAddrInst())
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; RUN: rm -rf %t && split-file --leading-lines %s %t
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;--- src_vec_dst_no_vec.ll
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; RUN: not llvm-as %t/src_vec_dst_no_vec.ll -o /dev/null 2>&1 | FileCheck -check-prefix=SRC_VEC_DST_NO_VEC %s --implicit-check-not="error:"
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@g = global i64 ptrtoaddr (<2 x ptr> <ptr @g, ptr @g> to i64)
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; SRC_VEC_DST_NO_VEC: [[#@LINE-1]]:17: error: invalid cast opcode for cast from '<2 x ptr>' to 'i64'
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;--- src_no_vec_dst_vec.ll
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; RUN: not llvm-as %t/src_no_vec_dst_vec.ll -o /dev/null 2>&1 | FileCheck -check-prefix=SRC_NO_VEC_DST_VEC %s --implicit-check-not="error:"
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@g = global <2 x i64> ptrtoaddr (ptr @g to <2 x i64>)
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; SRC_NO_VEC_DST_VEC: [[#@LINE-1]]:23: error: invalid cast opcode for cast from 'ptr' to '<2 x i64>'
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;--- dst_not_int.ll
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; RUN: not llvm-as %t/dst_not_int.ll -o /dev/null 2>&1 | FileCheck -check-prefix=DST_NOT_INT %s --implicit-check-not="error:"
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@g = global float ptrtoaddr (ptr @g to float)
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; DST_NOT_INT: [[#@LINE-1]]:19: error: invalid cast opcode for cast from 'ptr' to 'float'
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;--- dst_not_int_vec.ll
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; RUN: not llvm-as %t/dst_not_int_vec.ll -o /dev/null 2>&1 | FileCheck -check-prefix=DST_NOT_INT_VEC %s --implicit-check-not="error:"
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@g = global <2 x float> ptrtoaddr (<2 x ptr> <ptr @g, ptr @g> to <2 x float>)
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; DST_NOT_INT_VEC: [[#@LINE-1]]:25: error: invalid cast opcode for cast from '<2 x ptr>' to '<2 x float>'
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;--- src_not_ptr.ll
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; RUN: not llvm-as %t/src_not_ptr.ll -o /dev/null 2>&1 | FileCheck -check-prefix=SRC_NOT_PTR %s --implicit-check-not="error:"
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@g = global i64 ptrtoaddr (i32 1 to i64)
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; SRC_NOT_PTR: [[#@LINE-1]]:17: error: invalid cast opcode for cast from 'i32' to 'i64'
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;--- src_not_ptr_vec.ll
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; RUN: not llvm-as %t/src_not_ptr_vec.ll -o /dev/null 2>&1 | FileCheck -check-prefix=SRC_NOT_PTR_VEC %s --implicit-check-not="error:"
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@g = global <2 x i64> ptrtoaddr (<2 x i32> <i32 1, i32 2> to <2 x i64>)
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; SRC_NOT_PTR_VEC: [[#@LINE-1]]:23: error: invalid cast opcode for cast from '<2 x i32>' to '<2 x i64>'
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;--- vec_src_fewer_elems.ll
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; RUN: not llvm-as %t/vec_src_fewer_elems.ll -o /dev/null 2>&1 | FileCheck -check-prefix=VEC_SRC_FEWER_ELEMS %s --implicit-check-not="error:"
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@g = global <4 x i64> ptrtoaddr (<2 x ptr> <ptr @g, ptr @g> to <4 x i64>)
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; VEC_SRC_FEWER_ELEMS: [[#@LINE-1]]:23: error: invalid cast opcode for cast from '<2 x ptr>' to '<4 x i64>'
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;--- vec_dst_fewer_elems.ll
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; RUN: not llvm-as %t/vec_dst_fewer_elems.ll -o /dev/null 2>&1 | FileCheck -check-prefix=VEC_DST_FEWER_ELEMS %s --implicit-check-not="error:"
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@g = global <2 x i64> ptrtoaddr (<4 x ptr> <ptr @g, ptr @g, ptr @g, ptr @g> to <2 x i64>)
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; VEC_DST_FEWER_ELEMS: [[#@LINE-1]]:23: error: invalid cast opcode for cast from '<4 x ptr>' to '<2 x i64>'
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;--- dst_not_addr_size.ll
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; The following invalid IR is caught by the verifier, not the parser:
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; RUN: llvm-as %t/dst_not_addr_size.ll --disable-output --disable-verify
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; RUN: not llvm-as %t/dst_not_addr_size.ll -o /dev/null 2>&1 | FileCheck -check-prefix=DST_NOT_ADDR_SIZE %s --implicit-check-not="error:"
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; DST_NOT_ADDR_SIZE: assembly parsed, but does not verify as correct!
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@g = global i32 ptrtoaddr (ptr @g to i32)
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; DST_NOT_ADDR_SIZE-NEXT: PtrToAddr result must be address width
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; DST_NOT_ADDR_SIZE-NEXT: i32 ptrtoaddr (ptr @g to i32)
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@g_vec = global <4 x i32> ptrtoaddr (<4 x ptr> <ptr @g, ptr @g, ptr @g, ptr @g> to <4 x i32>)
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; TODO: Verifier.cpp does not visit ConstantVector/ConstantStruct values
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; TODO-DST_NOT_ADDR_SIZE: PtrToAddr result must be address width
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