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