callbr.ll
2.41 KB
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; RUN: opt -loop-unswitch %s -S | FileCheck %s
; We want to check that the loop does not get split (so only 2 callbr's not 4).
; It's ok to modify this test in the future should we allow the loop containing
; callbr to be unswitched and are able to do so correctly.
; CHECK: callbr void asm sideeffect "# ${0:l}", "X,~{dirflag},~{fpsr},~{flags}"(i8* blockaddress(@foo, %10))
; CHECK: to label %7 [label %10]
; CHECK: callbr void asm sideeffect "# ${0:l}", "X,~{dirflag},~{fpsr},~{flags}"(i8* blockaddress(@foo, %10))
; CHECK: to label %9 [label %10]
; CHECK-NOT: callbr void asm sideeffect "# ${0:l}", "X,~{dirflag},~{fpsr},~{flags}"(i8* blockaddress(@foo, %10))
; CHECK-NOT: to label %7 [label %10]
; CHECK-NOT: callbr void asm sideeffect "# ${0:l}", "X,~{dirflag},~{fpsr},~{flags}"(i8* blockaddress(@foo, %10))
; CHECK-NOT: to label %9 [label %10]
; CHECK-NOT: callbr void asm sideeffect "# ${0:l}", "X,~{dirflag},~{fpsr},~{flags}"(i8* blockaddress(@foo, %19))
; CHECK-NOT: to label %16 [label %19]
; CHECK-NOT: callbr void asm sideeffect "# ${0:l}", "X,~{dirflag},~{fpsr},~{flags}"(i8* blockaddress(@foo, %19))
; CHECK-NOT: to label %18 [label %19]
; This test is essentially:
; void foo(int n) {
; for (int i = 0; i < 1000; ++i)
; if (n) {
; asm goto("# %l0"::::bar);
; bar:;
; } else {
; asm goto("# %l0"::::baz);
; baz:;
; }
;}
define dso_local void @foo(i32) #0 {
br label %2
2: ; preds = %10, %1
%.0 = phi i32 [ 0, %1 ], [ %11, %10 ]
%3 = icmp ult i32 %.0, 1000
br i1 %3, label %4, label %12
4: ; preds = %2
%5 = icmp eq i32 %0, 0
br i1 %5, label %8, label %6
6: ; preds = %4
callbr void asm sideeffect "# ${0:l}", "X,~{dirflag},~{fpsr},~{flags}"(i8* blockaddress(@foo, %10)) #0
to label %7 [label %10]
7: ; preds = %6
br label %10
8: ; preds = %4
callbr void asm sideeffect "# ${0:l}", "X,~{dirflag},~{fpsr},~{flags}"(i8* blockaddress(@foo, %10)) #0
to label %9 [label %10]
9: ; preds = %8
br label %10
10: ; preds = %7, %6, %9, %8
%11 = add nuw nsw i32 %.0, 1
br label %2
12: ; preds = %2
ret void
}