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llvm-project/llvm/test/CodeGen/Mips/cconv/stack-alignment.ll

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[mips] Add calling convention tests covering O32, N32, and N64. Summary: I had difficulty finding tests for the N32 and N64 ABI so I've added a collection of calling convention tests based on the document MIPS ABIs Described (MD00305), the MIPSpro N32 Handbook, and the SYSV ABI. Where the documents/implementations disagree, I've used GCC to resolve the conflict. A few interesting details: * For N32, LLVM uses 64-bit pointers when saving $ra despite pointers being 32-bit. I've yet to find a supporting statement in the ABI documentation but the current behaviour matches GCC. * For O32, the non-variable portion of a varargs argument list is also subject to the rule that floating-point is passed via GPR's (on N32/N64 only the variable portion is subject to this rule). This agrees with GCC's behaviour and the SYSV ABI but contradicts part of the MIPSpro N32 Handbook which talks about O32's behaviour. * The N32 implementation has the wrong callee-saved register list. (I already have a fix for this but will commit it as a follow-up). I've left RUN-TODO lines in for O32 on MIPS64. I don't plan to support this case for now but we should revisit it. Reviewers: matheusalmeida, vmedic Reviewed By: matheusalmeida Differential Revision: http://reviews.llvm.org/D3339 llvm-svn: 206370
2014-04-16 17:59:46 +08:00
; RUN: llc -march=mips < %s | FileCheck --check-prefix=ALL --check-prefix=O32 %s
; RUN: llc -march=mipsel < %s | FileCheck --check-prefix=ALL --check-prefix=O32 %s
; RUN-TODO: llc -march=mips64 -mattr=-n64,+o32 < %s | FileCheck --check-prefix=ALL --check-prefix=O32 %s
; RUN-TODO: llc -march=mips64el -mattr=-n64,+o32 < %s | FileCheck --check-prefix=ALL --check-prefix=O32 %s
; RUN: llc -march=mips64 -mattr=-n64,+n32 < %s | FileCheck --check-prefix=ALL --check-prefix=N32 %s
; RUN: llc -march=mips64el -mattr=-n64,+n32 < %s | FileCheck --check-prefix=ALL --check-prefix=N32 %s
; RUN: llc -march=mips64 -mattr=-n64,+n64 < %s | FileCheck --check-prefix=ALL --check-prefix=N64 %s
; RUN: llc -march=mips64el -mattr=-n64,+n64 < %s | FileCheck --check-prefix=ALL --check-prefix=N64 %s
; Test the stack alignment for all ABI's and byte orders as specified by
; section 5 of MD00305 (MIPS ABIs Described).
define void @local_bytes_1() nounwind {
entry:
%0 = alloca i8
ret void
}
; ALL-LABEL: local_bytes_1:
; O32: addiu $sp, $sp, -8
; O32: addiu $sp, $sp, 8
; N32: addiu $sp, $sp, -16
; N32: addiu $sp, $sp, 16
; N64: addiu $sp, $sp, -16
; N64: addiu $sp, $sp, 16