| ; RUN: llc -mattr=avr6,sram < %s -march=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(i8* %x) { |
| store i8 0, i8* %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(i8* %ptr, i8 %n) { |
| %result = mul i8 %n, 3 |
| store i8 %result, i8* %ptr |
| ret void |
| } |
