forked from OSchip/llvm-project
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. |
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| .. | ||
| atomics | ||
| calling-conv/c | ||
| features | ||
| inline-asm | ||
| integration | ||
| intrinsics | ||
| pseudo | ||
| relax-mem | ||
| PR31344.ll | ||
| PR31345.ll | ||
| PR37143.ll | ||
| add.ll | ||
| alloca.ll | ||
| and.ll | ||
| avr-rust-issue-123.ll | ||
| branch-relaxation-long.ll | ||
| branch-relaxation.ll | ||
| brind.ll | ||
| call.ll | ||
| clear-bss.ll | ||
| cmp.ll | ||
| com.ll | ||
| copy-data-to-ram.ll | ||
| ctlz.ll | ||
| ctpop.ll | ||
| cttz.ll | ||
| directmem.ll | ||
| div.ll | ||
| dynalloca.ll | ||
| eor.ll | ||
| expand-integer-failure.ll | ||
| frame.ll | ||
| frmidx-iterator-bug.ll | ||
| hardware-mul.ll | ||
| high-pressure-on-ptrregs.ll | ||
| icall-func-pointer-correct-addr-space.ll | ||
| impossible-reg-to-reg-copy.ll | ||
| interrupts.ll | ||
| io.ll | ||
| issue-cannot-select-bswap.ll | ||
| issue-regalloc-stackframe-folding-earlyclobber.ll | ||
| jmp-long.ll | ||
| large-return-size.ll | ||
| lit.local.cfg | ||
| load.ll | ||
| lower-formal-args-struct-return.ll | ||
| lower-formal-arguments-assertion.ll | ||
| neg.ll | ||
| no-print-operand-twice.ll | ||
| or.ll | ||
| pre-schedule.ll | ||
| progmem-extended.ll | ||
| progmem.ll | ||
| rem.ll | ||
| return.ll | ||
| rot.ll | ||
| runtime-trig.ll | ||
| rust-avr-bug-37.ll | ||
| rust-avr-bug-95.ll | ||
| rust-avr-bug-99.ll | ||
| rust-avr-bug-112.ll | ||
| sections.ll | ||
| select-must-add-unconditional-jump.ll | ||
| sext.ll | ||
| shift.ll | ||
| sign-extension.ll | ||
| smul-with-overflow.ll | ||
| software-mul.ll | ||
| std-ldd-immediate-overflow.ll | ||
| store-undef.ll | ||
| store.ll | ||
| sub.ll | ||
| trunc.ll | ||
| umul-with-overflow.ll | ||
| umul.with.overflow.i16-bug.ll | ||
| unaligned-atomic-loads.ll | ||
| varargs.ll | ||
| xor.ll | ||
| zext.ll | ||