llvm-6502/test/CodeGen/ARM/2013-05-02-AAPCS-ByVal-Structs-C4-C5-VFP.ll
Stepan Dyatkovskiy 46abfcf418 For ARM backend, fixed "byval" attribute support.
Now even the small structures could be passed within byval (small enough
to be stored in GPRs).
In regression tests next function prototypes are checked:

PR15293:
  %artz = type { i32 }
  define void @foo(%artz* byval %s)
  define void @foo2(%artz* byval %s, i32 %p, %artz* byval %s2)
foo: "s" stored in R0
foo2: "s" stored in R0, "s2" stored in R2.

Next AAPCS rules are checked:
5.5 Parameters Passing, C.4 and C.5,
"ParamSize" is parameter size in 32bit words:
-- NSAA != 0, NCRN < R4 and NCRN+ParamSize > R4.
   Parameter should be sent to the stack; NCRN := R4.
-- NSAA != 0, and NCRN < R4, NCRN+ParamSize < R4.
   Parameter stored in GPRs; NCRN += ParamSize.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@181148 91177308-0d34-0410-b5e6-96231b3b80d8
2013-05-05 07:48:36 +00:00

49 lines
1.5 KiB
LLVM

;Check AAPCS, 5.5 Parameters Passing, C4 and C5 rules.
;Check case when NSAA != 0, and NCRN < R4, NCRN+ParamSize < R4
;RUN: llc -mtriple=thumbv7-linux-gnueabihf -float-abi=hard < %s | FileCheck %s
%st_t = type { i32, i32 }
@static_val = constant %st_t { i32 777, i32 888}
declare void @fooUseStruct(%st_t*)
define void @foo(double %vfp0, ; --> D0, NSAA=SP
double %vfp1, ; --> D1, NSAA=SP
double %vfp2, ; --> D2, NSAA=SP
double %vfp3, ; --> D3, NSAA=SP
double %vfp4, ; --> D4, NSAA=SP
double %vfp5, ; --> D5, NSAA=SP
double %vfp6, ; --> D6, NSAA=SP
double %vfp7, ; --> D7, NSAA=SP
double %vfp8, ; --> SP, NSAA=SP+8 (!)
i32 %p0, ; --> R0, NSAA=SP+8
%st_t* byval %p1, ; --> R1, R2, NSAA=SP+8
i32 %p2, ; --> R3, NSAA=SP+8
i32 %p3) #0 { ; --> SP+4, NSAA=SP+12
entry:
;CHECK: sub sp, #8
;CHECK: push.w {r11, lr}
;CHECK: add r0, sp, #16
;CHECK: str r2, [sp, #20]
;CHECK: str r1, [sp, #16]
;CHECK: bl fooUseStruct
call void @fooUseStruct(%st_t* %p1)
ret void
}
define void @doFoo() {
entry:
call void @foo(double 23.0,
double 23.1,
double 23.2,
double 23.3,
double 23.4,
double 23.5,
double 23.6,
double 23.7,
double 23.8,
i32 0, %st_t* byval @static_val, i32 1, i32 2)
ret void
}