a1710eb3cd
The LIT test cases were migrated with the script provided by Nikita Popov. No manual changes were made. Committed without review since no functional changes, after consultation with uweigand.
39 lines
1.0 KiB
LLVM
39 lines
1.0 KiB
LLVM
; Test BRCTH.
|
|
|
|
; RUN: llc < %s -verify-machineinstrs -mtriple=s390x-linux-gnu -mcpu=z196 \
|
|
; RUN: -no-integrated-as -disable-block-placement | FileCheck %s
|
|
|
|
; Test a loop that should be converted into dbr form and then use BRCTH.
|
|
define void @f2(ptr %src, ptr %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, ptr %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, ptr %dest
|
|
br label %loop.next
|
|
|
|
loop.next:
|
|
%cont = icmp ne i32 %next, %top
|
|
br i1 %cont, label %loop, label %exit
|
|
|
|
exit:
|
|
ret void
|
|
}
|
|
|