blob: 38d515f9227ff41fcee45f9e7b51d6652cb8f68e [file] [log] [blame]
;Check 5.5 Parameter Passing --> Stage C --> C.4 statement, when NSAA is not
;equal to SP.
; Our purpose: make NSAA != SP, and only after start to use GPRs.
;Co-Processor register candidates may be either in VFP or in stack, so after
;all VFP are allocated, stack is used. We can use stack without GPR allocation
;in that case, passing 9 f64 params, for example.
;First eight params goes to d0-d7, ninth one goes to the stack.
;Now, as 10th parameter, we pass i32, and it must go to R0.
;5.5 Parameter Passing, Stage C:
;C.2.cp If the argument is a CPRC then any co-processor registers in that class
;that are unallocated are marked as unavailable. The NSAA is adjusted upwards
;until it is correctly aligned for the argument and the argument is copied to
;the memory at the adjusted NSAA. The NSAA is further incremented by the size
;of the argument. The argument has now been allocated.
;C.4 If the size in words of the argument is not more than r4 minus NCRN, the
;argument is copied into core registers, starting at the NCRN. The NCRN is
;incremented by the number of registers used. Successive registers hold the
;parts of the argument they would hold if its value were loaded into those
;registers from memory using an LDM instruction. The argument has now been
;What is actually checked here:
;Here we check that i32 param goes to r0.
;Current test-case was produced with command:
;arm-linux-gnueabihf-clang -mcpu=cortex-a9 params-to-GPR.c -S -O1 -emit-llvm
;// params-to-GRP.c:
;void fooUseI32(unsigned);
;void foo(long double p0,
; long double p1,
; long double p2,
; long double p3,
; long double p4,
; long double p5,
; long double p6,
; long double p7,
; long double p8,
; unsigned p9) {
; fooUseI32(p9);
;void doFoo() {
; foo( 1,2,3,4,5,6,7,8,9, 43 );
;RUN: llc -mtriple=thumbv7-linux-gnueabihf -float-abi=hard < %s | FileCheck %s
;CHECK: foo:
;CHECK-NOT: mov r0
;CHECK-NOT: ldr r0
;CHECK: bl fooUseI32
;CHECK: doFoo:
;CHECK: movs r0, #43
;CHECK: bl foo
define void @foo(double %p0, ; --> D0
double %p1, ; --> D1
double %p2, ; --> D2
double %p3, ; --> D3
double %p4, ; --> D4
double %p5, ; --> D5
double %p6, ; --> D6
double %p7, ; --> D7
double %p8, ; --> Stack
i32 %p9) #0 { ; --> R0, not Stack+8
tail call void @fooUseI32(i32 %p9)
ret void
declare void @fooUseI32(i32)
define void @doFoo() {
tail call void @foo(double 23.0, ; --> D0
double 23.1, ; --> D1
double 23.2, ; --> D2
double 23.3, ; --> D3
double 23.4, ; --> D4
double 23.5, ; --> D5
double 23.6, ; --> D6
double 23.7, ; --> D7
double 23.8, ; --> Stack
i32 43) ; --> R0, not Stack+8
ret void