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2930fae4b8
This makes it more likely that we can use the 16-bit push and pop instructions on Thumb-2, saving around 4 bytes per function. Differential Revision: http://reviews.llvm.org/D9165 llvm-svn: 235637
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 {r7, 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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