| ; Test BRCTH. |
| |
| ; RUN: llc < %s -verify-machineinstrs -mtriple=s390x-linux-gnu -mcpu=z196 \ |
| ; RUN: -no-integrated-as | FileCheck %s |
| |
| ; Test a loop that should be converted into dbr form and then use BRCTH. |
| define void @f2(i32 *%src, i32 *%dest) { |
| ; CHECK-LABEL: f2: |
| ; CHECK: blah [[REG:%r[0-5]]] |
| ; CHECK: [[LABEL:\.[^:]*]]:{{.*}} %loop |
| ; CHECK: brcth [[REG]], [[LABEL]] |
| ; CHECK: br %r14 |
| entry: |
| ; Force upper bound into a high register in order to encourage the |
| ; register allocator to use a high register for the count variable. |
| %top = call i32 asm sideeffect "blah $0", "=h"() |
| br label %loop |
| |
| loop: |
| %count = phi i32 [ 0, %entry ], [ %next, %loop.next ] |
| %next = add i32 %count, 1 |
| %val = load volatile i32, i32 *%src |
| %cmp = icmp eq i32 %val, 0 |
| br i1 %cmp, label %loop.next, label %loop.store |
| |
| loop.store: |
| %add = add i32 %val, 1 |
| store volatile i32 %add, i32 *%dest |
| br label %loop.next |
| |
| loop.next: |
| %cont = icmp ne i32 %next, %top |
| br i1 %cont, label %loop, label %exit |
| |
| exit: |
| ret void |
| } |
| |
