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This adds a safe interface to the machine independent InputArg struct for accessing the index of the original (IR-level) argument. When a non-native return type is lowered, we generate the hidden machine-level sret argument on-the-fly. Before this fix, we were representing this argument as OrigArgIndex == 0, which is an outright lie. In particular this crashed in the AArch64 backend where we actually try to access the type of the original argument. Now we use a sentinel value for machine arguments that have no original argument index. AArch64, ARM, Mips, and PPC now check for this case before accessing the original argument. Fixes <rdar://19792160> Null pointer assertion in AArch64TargetLowering git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@229413 91177308-0d34-0410-b5e6-96231b3b80d8 |
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