1 ;Check 5.5 Parameter Passing --> Stage C --> C.5 statement, when NSAA is not 2 ;equal to SP. 3 ; 4 ; Our purpose: make NSAA != SP, and only after start to use GPRs, then pass 5 ; byval parameter and check that it goes to stack only. 6 ; 7 ;Co-Processor register candidates may be either in VFP or in stack, so after 8 ;all VFP are allocated, stack is used. We can use stack without GPR allocation 9 ;in that case, passing 9 f64 params, for example. 10 ;First eight params goes to d0-d7, ninth one goes to the stack. 11 ;Now, as 10th parameter, we pass i32, and it must go to R0. 12 ; 13 ;For more information, 14 ;please, read 5.5 Parameter Passing, Stage C, stages C.2.cp, C.4 and C.5 15 ; 16 ; 17 ;RUN: llc -mtriple=thumbv7-linux-gnueabihf -float-abi=hard < %s | FileCheck %s 18 19 %struct_t = type { i32, i32, i32, i32 } 20 @static_val = constant %struct_t { i32 777, i32 888, i32 999, i32 1000 } 21 declare void @fooUseStruct(%struct_t*) 22 23 define void @foo2(double %p0, ; --> D0 24 double %p1, ; --> D1 25 double %p2, ; --> D2 26 double %p3, ; --> D3 27 double %p4, ; --> D4 28 double %p5, ; --> D5 29 double %p6, ; --> D6 30 double %p7, ; --> D7 31 double %p8, ; --> Stack 32 i32 %p9, ; --> R0 33 %struct_t* byval %p10) ; --> Stack+8 34 { 35 entry: 36 ;CHECK: push {r7, lr} 37 ;CHECK-NOT: stm 38 ;CHECK: add r0, sp, #16 39 ;CHECK: bl fooUseStruct 40 call void @fooUseStruct(%struct_t* %p10) 41 42 ret void 43 } 44 45 define void @doFoo2() { 46 entry: 47 ;CHECK-NOT: ldm 48 tail call void @foo2(double 23.0, ; --> D0 49 double 23.1, ; --> D1 50 double 23.2, ; --> D2 51 double 23.3, ; --> D3 52 double 23.4, ; --> D4 53 double 23.5, ; --> D5 54 double 23.6, ; --> D6 55 double 23.7, ; --> D7 56 double 23.8, ; --> Stack 57 i32 43, ; --> R0, not Stack+8 58 %struct_t* byval @static_val) ; --> Stack+8, not R1 59 ret void 60 } 61 62
