derek.holloway
7502bf64a4
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52 lines
1.4 KiB
LLVM
52 lines
1.4 KiB
LLVM
; RUN: llc -mcpu=atmega328 < %s -mtriple=avr | FileCheck %s
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; This test verifies that the pointer to a basic block
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; should always be a pointer in address space 1.
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;
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; If this were not the case, then programs targeting
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; AVR that attempted to read their own machine code
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; via a pointer to a label would actually read from RAM
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; using a pointer relative to the the start of program flash.
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;
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; This would cause a load of uninitialized memory, not even
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; touching the program's machine code as otherwise desired.
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target datalayout = "e-P1-p:16:8-i8:8-i16:8-i32:8-i64:8-f32:8-f64:8-n8-a:8"
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; CHECK-LABEL: load_with_no_forward_reference
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define i8 @load_with_no_forward_reference(i8 %a, i8 %b) {
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second:
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; CHECK: ldi r30, .Ltmp0+2
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; CHECK-NEXT: ldi r31, .Ltmp0+4
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; CHECK: lpm r24, Z
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%bar = load i8, ptr addrspace(1) blockaddress(@function_with_no_forward_reference, %second)
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ret i8 %bar
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}
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; CHECK-LABEL: load_from_local_label
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define i8 @load_from_local_label(i8 %a, i8 %b) {
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entry:
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%result1 = add i8 %a, %b
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br label %second
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; CHECK-LABEL: .Ltmp1:
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second:
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; CHECK: ldi r30, .Ltmp1+2
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; CHECK-NEXT: ldi r31, .Ltmp1+4
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; CHECK-NEXT: lpm r24, Z
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%result2 = load i8, ptr addrspace(1) blockaddress(@load_from_local_label, %second)
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ret i8 %result2
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}
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; A function with no forward reference, right at the end
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; of the file.
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define i8 @function_with_no_forward_reference(i8 %a, i8 %b) {
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entry:
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%result = add i8 %a, %b
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br label %second
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second:
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ret i8 0
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}
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