| ; 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 | |
| } |