You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
96 lines
2.9 KiB
96 lines
2.9 KiB
;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
|
|
;allocated.
|
|
;
|
|
;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-LABEL: foo:
|
|
;CHECK-NOT: mov r0
|
|
;CHECK-NOT: ldr r0
|
|
;CHECK: bl fooUseI32
|
|
;CHECK-LABEL: 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
|
|
entry:
|
|
call void @fooUseI32(i32 %p9)
|
|
ret void
|
|
}
|
|
|
|
declare void @fooUseI32(i32)
|
|
|
|
define void @doFoo() {
|
|
entry:
|
|
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
|
|
}
|
|
|