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TheRock/compiler/amd-llvm/llvm/test/CodeGen/AVR/zeroreg.ll
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Flatten subprojects into a single base monorepo
2026-09-02 16:34:47 -07:00

28 lines
699 B
LLVM

; RUN: llc -mattr=avr6,sram < %s -mtriple=avr | FileCheck %s
; This file tests whether the compiler correctly works with the r1 register,
; clearing it when needed.
; Test regular use of r1 as a zero register.
; CHECK-LABEL: store8zero:
; CHECK: st {{[XYZ]}}, r1
; CHECK-NEXT: mov r24, r1
; CHECK-NEXT: ret
define i8 @store8zero(ptr %x) {
store i8 0, ptr %x
ret i8 0
}
; Test that mulitplication instructions (mul, muls, etc) clobber r1 and require
; a "clr r1" instruction.
; CHECK-LABEL: mul:
; CHECK: muls
; CHECK-NEXT: clr r1
; CHECK-NEXT: st {{[XYZ]}}, r0
; CHECK-NEXT: ret
define void @mul(ptr %ptr, i8 %n) {
%result = mul i8 %n, 3
store i8 %result, ptr %ptr
ret void
}