14120227a3
For the purpose of verifying proper arguments extensions per the target's ABI, introduce the NoExt attribute that may be used by a target when neither sign- or zeroextension is required (e.g. with a struct in register). The purpose of doing so is to be able to verify that there is always one of these attributes present and by this detecting cases where sign/zero extension is actually missing. As a first step, this patch has the verification step done for the SystemZ backend only, but left off by default until all known issues have been addressed. Other targets/front-ends can now also add NoExt attribute where needed and do this check in the backend.
40 lines
1.0 KiB
LLVM
40 lines
1.0 KiB
LLVM
; RUN: llc < %s -mtriple=s390x-linux-gnu -argext-abi-check
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; Test that it works to pass structs as outgoing call arguments when the
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; NoExt attribute is given, either in the call instruction or in the
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; prototype of the called function.
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define void @caller() {
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call void @bar_Struct_32(i32 noext 123)
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call void @bar_Struct_16(i16 123)
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call void @bar_Struct_8(i8 noext 123)
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ret void
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}
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declare void @bar_Struct_32(i32 %Arg)
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declare void @bar_Struct_16(i16 noext %Arg)
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declare void @bar_Struct_8(i8 %Arg)
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; Test that it works to return values with the NoExt attribute.
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define noext i8 @callee_NoExtRet_i8() {
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ret i8 -1
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}
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define noext i16 @callee_NoExtRet_i16() {
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ret i16 -1
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}
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define noext i32 @callee_NoExtRet_i32() {
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ret i32 -1
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}
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; An internal function is not checked for an extension attribute.
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define internal i32 @callee_NoExtRet_internal(i32 %Arg) {
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ret i32 %Arg
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}
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; A call to an internal function is ok without argument extension.
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define void @caller_internal() {
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call i32 @callee_NoExtRet_internal(i32 0)
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ret void
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}
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