| ; 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 | |
| } | |