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8adaf54376
-- C.4 and C.5 statements, when NSAA is not equal to SP.
-- C.1.cp statement for VA functions. Note: There are no VFP CPRCs in a
variadic procedure.
Before this patch "NSAA != 0" means "don't use GPRs anymore ". But there are
some exceptions in AAPCS.
1. For non VA function: allocate all VFP regs for CPRC. When all VFPs are allocated
CPRCs would be sent to stack, while non CPRCs may be still allocated in GRPs.
2. Check that for VA functions all params uses GPRs and then stack.
No exceptions, no CPRCs here.
llvm-svn: 180011
62 lines
2.0 KiB
LLVM
62 lines
2.0 KiB
LLVM
;Check 5.5 Parameter Passing --> Stage C --> C.5 statement, when NSAA is not
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;equal to SP.
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;
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; Our purpose: make NSAA != SP, and only after start to use GPRs, then pass
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; byval parameter and check that it goes to stack only.
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;
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;Co-Processor register candidates may be either in VFP or in stack, so after
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;all VFP are allocated, stack is used. We can use stack without GPR allocation
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;in that case, passing 9 f64 params, for example.
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;First eight params goes to d0-d7, ninth one goes to the stack.
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;Now, as 10th parameter, we pass i32, and it must go to R0.
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;
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;For more information,
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;please, read 5.5 Parameter Passing, Stage C, stages C.2.cp, C.4 and C.5
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;
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;
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;RUN: llc -mtriple=thumbv7-linux-gnueabihf -float-abi=hard < %s | FileCheck %s
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%struct_t = type { i32, i32, i32, i32 }
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@static_val = constant %struct_t { i32 777, i32 888, i32 999, i32 1000 }
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declare void @fooUseStruct(%struct_t*)
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define void @foo2(double %p0, ; --> D0
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double %p1, ; --> D1
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double %p2, ; --> D2
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double %p3, ; --> D3
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double %p4, ; --> D4
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double %p5, ; --> D5
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double %p6, ; --> D6
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double %p7, ; --> D7
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double %p8, ; --> Stack
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i32 %p9, ; --> R0
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%struct_t* byval %p10) ; --> Stack+8
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{
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entry:
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;CHECK: push.w {r11, lr}
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;CHECK-NOT: stm
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;CHECK: add r0, sp, #16
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;CHECK: bl fooUseStruct
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call void @fooUseStruct(%struct_t* %p10)
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ret void
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}
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define void @doFoo2() {
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entry:
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;CHECK-NOT: ldm
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tail call void @foo2(double 23.0, ; --> D0
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double 23.1, ; --> D1
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double 23.2, ; --> D2
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double 23.3, ; --> D3
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double 23.4, ; --> D4
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double 23.5, ; --> D5
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double 23.6, ; --> D6
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double 23.7, ; --> D7
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double 23.8, ; --> Stack
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i32 43, ; --> R0, not Stack+8
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%struct_t* byval @static_val) ; --> Stack+8, not R1
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ret void
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}
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