1*9880d681SAndroid Build Coastguard Worker; RUN: llc < %s -mtriple=x86_64-apple-darwin -mcpu=corei7 | FileCheck %s 2*9880d681SAndroid Build Coastguard Worker 3*9880d681SAndroid Build Coastguard Worker; Check that the X86 stackmap shadow optimization is only outputting a 3-byte 4*9880d681SAndroid Build Coastguard Worker; nop here. 8-bytes are requested, but 5 are covered by the code for the call to 5*9880d681SAndroid Build Coastguard Worker; bar. However, the frame teardown and the return do not count towards the 6*9880d681SAndroid Build Coastguard Worker; stackmap shadow as the call return counts as a branch target so must flush 7*9880d681SAndroid Build Coastguard Worker; the shadow. 8*9880d681SAndroid Build Coastguard Worker; Note that in order for a thread to not return in to the patched space 9*9880d681SAndroid Build Coastguard Worker; the call must be at the end of the shadow, so the required nop must be 10*9880d681SAndroid Build Coastguard Worker; before the call, not after. 11*9880d681SAndroid Build Coastguard Workerdefine void @shadow_optimization_test() { 12*9880d681SAndroid Build Coastguard Workerentry: 13*9880d681SAndroid Build Coastguard Worker; CHECK-LABEL: shadow_optimization_test: 14*9880d681SAndroid Build Coastguard Worker; CHECK: callq _bar 15*9880d681SAndroid Build Coastguard Worker; CHECK: nop 16*9880d681SAndroid Build Coastguard Worker; CHECK: callq _bar 17*9880d681SAndroid Build Coastguard Worker; CHECK-NOT: nop 18*9880d681SAndroid Build Coastguard Worker; CHECK: callq _bar 19*9880d681SAndroid Build Coastguard Worker; CHECK-NOT: nop 20*9880d681SAndroid Build Coastguard Worker call void @bar() 21*9880d681SAndroid Build Coastguard Worker tail call void (i64, i32, ...) @llvm.experimental.stackmap(i64 0, i32 8) 22*9880d681SAndroid Build Coastguard Worker call void @bar() 23*9880d681SAndroid Build Coastguard Worker call void @bar() 24*9880d681SAndroid Build Coastguard Worker ret void 25*9880d681SAndroid Build Coastguard Worker} 26*9880d681SAndroid Build Coastguard Worker 27*9880d681SAndroid Build Coastguard Workerdeclare void @llvm.experimental.stackmap(i64, i32, ...) 28*9880d681SAndroid Build Coastguard Workerdeclare void @bar() 29