callbr.ll
1.65 KB
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; RUN: opt -loop-unroll -S %s | FileCheck %s
; Check that the loop body exists.
; CHECK: for.body
; CHECK: if.then
; CHECK: asm.fallthrough
; CHECK: l_yes
; CHECK: for.inc
; Check that the loop body does not get unrolled. We could modify this test in
; the future to support loop unrolling callbr's IFF we checked that the callbr
; operands were unrolled/updated correctly, as today they are not.
; CHECK-NOT: if.then.1
; CHECK-NOT: asm.fallthrough.1
; CHECK-NOT: l_yes.1
; CHECK-NOT: for.inc.1
; CHECK-NOT: if.then.2
; CHECK-NOT: asm.fallthrough.2
; CHECK-NOT: l_yes.2
; CHECK-NOT: for.inc.2
define dso_local void @d() {
entry:
br label %for.body
for.cond.cleanup: ; preds = %for.inc
ret void
for.body: ; preds = %for.inc, %entry
%e.04 = phi i32 [ 0, %entry ], [ %inc, %for.inc ]
%tobool = icmp eq i32 %e.04, 0
br i1 %tobool, label %for.inc, label %if.then
if.then: ; preds = %for.body
callbr void asm sideeffect "1: nop\0A\09.quad b, ${0:l}, $$5\0A\09", "X,~{dirflag},~{fpsr},~{flags}"(i8* blockaddress(@d, %l_yes))
to label %asm.fallthrough [label %l_yes]
asm.fallthrough: ; preds = %if.then
br label %l_yes
l_yes: ; preds = %asm.fallthrough, %if.then
%call = tail call i32 (...) @g()
br label %for.inc
for.inc: ; preds = %for.body, %l_yes
%inc = add nuw nsw i32 %e.04, 1
%exitcond = icmp eq i32 %inc, 3
br i1 %exitcond, label %for.cond.cleanup, label %for.body
}
declare dso_local i32 @g(...) local_unnamed_addr