8202a3da3c
All hardware address spaces on AVR can be freely cast between (they keep the same bit pattern). They just aren't dereferenceable when they're in a different address space as they really do point to a separate address space. This is supported in avr-gcc: https://godbolt.org/z/9Gfvhnhv9 avr-gcc also supports the `__memx` address space which is 24 bits. We don't support this address space yet but I've added a safeguard just in case. Differential Revison: https://reviews.llvm.org/D142107
66 lines
1.8 KiB
LLVM
66 lines
1.8 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -mtriple=avr | FileCheck %s
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@global = external global i8
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@progmem = external addrspace(1) global i8
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declare void @func() addrspace(1)
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declare void @doCallback(ptr) addrspace(1)
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define ptr @casttodata(ptr addrspace(1) %funcptr) addrspace(1) {
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; CHECK-LABEL: casttodata:
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; CHECK: ; %bb.0:
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; CHECK-NEXT: ret
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%result = addrspacecast ptr addrspace(1) %funcptr to ptr
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ret ptr %result
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}
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define ptr addrspace(1) @casttofuncptr(ptr %data) addrspace(1) {
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; CHECK-LABEL: casttofuncptr:
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; CHECK: ; %bb.0:
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; CHECK-NEXT: ret
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%result = addrspacecast ptr %data to ptr addrspace(1)
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ret ptr addrspace(1) %result
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}
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define ptr addrspace(1) @castglobal() addrspace(1) {
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; CHECK-LABEL: castglobal:
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; CHECK: ; %bb.0:
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; CHECK-NEXT: ldi r24, lo8(global)
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; CHECK-NEXT: ldi r25, hi8(global)
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; CHECK-NEXT: ret
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%result = addrspacecast ptr @global to ptr addrspace(1)
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ret ptr addrspace(1) %result
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}
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define ptr @castprogmem() addrspace(1) {
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; CHECK-LABEL: castprogmem:
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; CHECK: ; %bb.0:
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; CHECK-NEXT: ldi r24, lo8(progmem)
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; CHECK-NEXT: ldi r25, hi8(progmem)
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; CHECK-NEXT: ret
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%result = addrspacecast ptr addrspace(1) @progmem to ptr
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ret ptr %result
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}
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define ptr @castfunc() addrspace(1) {
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; CHECK-LABEL: castfunc:
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; CHECK: ; %bb.0:
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; CHECK-NEXT: ldi r24, pm_lo8(func)
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; CHECK-NEXT: ldi r25, pm_hi8(func)
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; CHECK-NEXT: ret
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%result = addrspacecast ptr addrspace(1) @func to ptr
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ret ptr %result
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}
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define void @callCallback() addrspace(1) {
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; CHECK-LABEL: callCallback:
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; CHECK: ; %bb.0:
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; CHECK-NEXT: ldi r24, pm_lo8(func)
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; CHECK-NEXT: ldi r25, pm_hi8(func)
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; CHECK-NEXT: rcall doCallback
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; CHECK-NEXT: ret
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call addrspace(1) void @doCallback(ptr addrspacecast (ptr addrspace(1) @func to ptr))
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ret void
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}
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