b9c26a9cfe
Summary: The previous version relied on the standard calling convention using std::reverse() to try to force the AVR ABI. But this only works for simple cases, it fails for example with aggregate types. This patch rewrites the calling convention with custom C++ code, that implements the ABI defined in https://gcc.gnu.org/wiki/avr-gcc. To do that it adds a few 16-bit pseudo registers for unaligned argument passing, such as R24R23. For example this function: define void @fun({ i8, i16 } %a) will pass %a.0 in R22 and %a.1 in R24R23. There are no instructions that can use these pseudo registers, so a new register class, DREGSMOVW, is defined to make them apart. Also the ArgCC_AVR_BUILTIN_DIV is no longer necessary, as it is identical to the C++ behavior (actually the clobber list is more strict for __div* functions, but that is currently unimplemented). Reviewers: dylanmckay Subscribers: Gaelan, Sh4rK, indirect, jwagen, efriedma, dsprenkels, hiraditya, Jim, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D68524 Patch by Rodrigo Rivas Costa.
49 lines
1.6 KiB
LLVM
49 lines
1.6 KiB
LLVM
; RUN: llc < %s -march=avr | FileCheck %s
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declare void @ret_void_args_struct_i8_i32({ i8, i32 } %a)
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declare void @ret_void_args_struct_i8_i8_i8_i8({ i8, i8, i8, i8 } %a)
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declare void @ret_void_args_struct_i32_i16_i8({ i32, i16, i8} %a)
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declare void @ret_void_args_struct_i8_i32_struct_i32_i8({ i8, i32 } %a, { i32, i8 } %b)
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; CHECK-LABEL: call_void_args_struct_i8_i32
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define void @call_void_args_struct_i8_i32() {
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; CHECK: ldi r20, 64
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; CHECK-NEXT: r21,
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; CHECK-NEXT: r22,
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; CHECK-NEXT: r23,
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; CHECK-NEXT: r24,
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call void @ret_void_args_struct_i8_i32({ i8, i32 } { i8 64, i32 16909060 })
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ret void
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}
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; CHECK-LABEL: @call_void_args_struct_i8_i8_i8_i8
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define void @call_void_args_struct_i8_i8_i8_i8() {
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; CHECK: ldi r22, 1
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; CHECK-NEXT: ldi r23, 2
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; CHECK-NEXT: ldi r24, 3
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; CHECK-NEXT: ldi r25, 4
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call void @ret_void_args_struct_i8_i8_i8_i8({ i8, i8, i8, i8 } { i8 1, i8 2, i8 3, i8 4 })
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ret void
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}
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; CHECK-LABEL: @call_void_args_struct_i32_i16_i8
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define void @call_void_args_struct_i32_i16_i8() {
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; CHECK: ldi r18, 4
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; CHECK-NEXT: ldi r19, 3
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; CHECK-NEXT: ldi r20, 2
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; CHECK-NEXT: ldi r21, 1
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; CHECK-NEXT: ldi r22, 23
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; CHECK-NEXT: ldi r23, 22
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; CHECK-NEXT: ldi r24, 64
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call void @ret_void_args_struct_i32_i16_i8({ i32, i16, i8 } { i32 16909060, i16 5655, i8 64 })
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ret void
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}
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; CHECK-LABEL: @call_void_args_struct_i8_i32_struct_i32_i8
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define void @call_void_args_struct_i8_i32_struct_i32_i8() {
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; CHECK: ldi r20, 64
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; CHECK: ldi r18, 65
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call void @ret_void_args_struct_i8_i32_struct_i32_i8({ i8, i32 } { i8 64, i32 16909060 }, { i32, i8 } { i32 287454020, i8 65 })
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ret void
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}
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