1*5eb64110SUlrich Weigand; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s 2*5eb64110SUlrich Weigand 3*5eb64110SUlrich Weigand; Check that the stackmap shadow optimization is only outputting a 2-byte 4*5eb64110SUlrich Weigand; nop here. 8-bytes are requested, but 6 are covered by the code for the call to 5*5eb64110SUlrich Weigand; bar. However, the frame teardown and the return do not count towards the 6*5eb64110SUlrich Weigand; stackmap shadow as the call return counts as a branch target so must flush 7*5eb64110SUlrich Weigand; the shadow. 8*5eb64110SUlrich Weigand; Note that in order for a thread to not return in to the patched space 9*5eb64110SUlrich Weigand; the call must be at the end of the shadow, so the required nop must be 10*5eb64110SUlrich Weigand; before the call, not after. 11*5eb64110SUlrich Weiganddefine void @shadow_optimization_test() { 12*5eb64110SUlrich Weigandentry: 13*5eb64110SUlrich Weigand; CHECK-LABEL: shadow_optimization_test: 14*5eb64110SUlrich Weigand; CHECK: brasl %r14, bar@PLT 15*5eb64110SUlrich Weigand; CHECK-NEXT: .Ltmp 16*5eb64110SUlrich Weigand; CHECK-NEXT: bcr 0, %r0 17*5eb64110SUlrich Weigand; CHECK-NEXT: brasl %r14, bar@PLT 18*5eb64110SUlrich Weigand; CHECK-NEXT: brasl %r14, bar@PLT 19*5eb64110SUlrich Weigand call void @bar() 20*5eb64110SUlrich Weigand tail call void (i64, i32, ...) @llvm.experimental.stackmap(i64 0, i32 8) 21*5eb64110SUlrich Weigand call void @bar() 22*5eb64110SUlrich Weigand call void @bar() 23*5eb64110SUlrich Weigand ret void 24*5eb64110SUlrich Weigand} 25*5eb64110SUlrich Weiganddeclare void @bar() 26*5eb64110SUlrich Weigand 27*5eb64110SUlrich Weiganddeclare void @llvm.experimental.stackmap(i64, i32, ...) 28