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