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https://github.com/RPCSX/llvm.git
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52f83a9ab3
The main issue being fixed here is that APCS targets handling a "byval align N" parameter with N > 4 were miscounting what objects were where on the stack, leading to FrameLowering setting the frame pointer incorrectly and clobbering the stack. But byval handling had grown over many years, and had multiple layers of cruft trying to compensate for each other and calculate padding correctly. This only really needs to be done once, in the HandleByVal function. Elsewhere should just do what it's told by that call. I also stripped out unnecessary APCS/AAPCS distinctions (now that Clang emits byvals with the correct C ABI alignment), which simplified HandleByVal. rdar://20095672 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231959 91177308-0d34-0410-b5e6-96231b3b80d8
116 lines
2.7 KiB
LLVM
116 lines
2.7 KiB
LLVM
; RUN: llc -mtriple=arm-linux-gnueabihf < %s | FileCheck %s
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%struct4bytes = type { i32 }
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%struct8bytes8align = type { i64 }
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%struct12bytes = type { i32, i32, i32 }
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declare void @useIntPtr(%struct4bytes*)
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declare void @useLong(i64)
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declare void @usePtr(%struct8bytes8align*)
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; a -> r0
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; b -> r1..r3
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; c -> sp+0..sp+7
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define void @foo1(i32 %a, %struct12bytes* byval %b, i64 %c) {
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; CHECK-LABEL: foo1
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; CHECK: sub sp, sp, #12
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; CHECK: push {r11, lr}
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; CHECK: sub sp, sp, #4
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; CHECK: add [[SCRATCH:r[0-9]+]], sp, #12
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; CHECK: stm [[SCRATCH]], {r1, r2, r3}
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; CHECK: ldr r0, [sp, #24]
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; CHECK: ldr r1, [sp, #28]
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; CHECK: bl useLong
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; CHECK: pop {r11, lr}
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; CHECK: add sp, sp, #12
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call void @useLong(i64 %c)
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ret void
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}
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; a -> r0
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; b -> r2..r3
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define void @foo2(i32 %a, %struct8bytes8align* byval %b) {
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; CHECK-LABEL: foo2
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; CHECK: sub sp, sp, #8
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; CHECK: push {r11, lr}
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; CHECK: add r0, sp, #8
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; CHECK: str r3, [sp, #12]
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; CHECK: str r2, [sp, #8]
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; CHECK: bl usePtr
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; CHECK: pop {r11, lr}
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; CHECK: add sp, sp, #8
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call void @usePtr(%struct8bytes8align* %b)
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ret void
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}
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; a -> r0..r1
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; b -> r2
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define void @foo3(%struct8bytes8align* byval %a, %struct4bytes* byval %b) {
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; CHECK-LABEL: foo3
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; CHECK: sub sp, sp, #16
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; CHECK: push {r11, lr}
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; CHECK: add [[SCRATCH:r[0-9]+]], sp, #8
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; CHECK: stm [[SCRATCH]], {r0, r1, r2}
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; CHECK: add r0, sp, #8
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; CHECK: bl usePtr
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; CHECK: pop {r11, lr}
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; CHECK: add sp, sp, #16
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call void @usePtr(%struct8bytes8align* %a)
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ret void
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}
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; a -> r0
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; b -> r2..r3
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define void @foo4(%struct4bytes* byval %a, %struct8bytes8align* byval %b) {
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; CHECK-LABEL: foo4
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; CHECK: sub sp, sp, #16
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; CHECK: push {r11, lr}
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; CHECK: str r0, [sp, #8]
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; CHECK: add r0, sp, #16
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; CHECK: str r3, [sp, #20]
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; CHECK: str r2, [sp, #16]
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; CHECK: bl usePtr
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; CHECK: pop {r11, lr}
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; CHECK: add sp, sp, #16
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; CHECK: mov pc, lr
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call void @usePtr(%struct8bytes8align* %b)
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ret void
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}
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; a -> r0..r1
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; b -> r2
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; c -> r3
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define void @foo5(%struct8bytes8align* byval %a, %struct4bytes* byval %b, %struct4bytes* byval %c) {
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; CHECK-LABEL: foo5
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; CHECK: sub sp, sp, #16
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; CHECK: push {r11, lr}
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; CHECK: add [[SCRATCH:r[0-9]+]], sp, #8
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; CHECK: stm [[SCRATCH]], {r0, r1, r2, r3}
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; CHECK: add r0, sp, #8
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; CHECK: bl usePtr
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; CHECK: pop {r11, lr}
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; CHECK: add sp, sp, #16
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; CHECK: mov pc, lr
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call void @usePtr(%struct8bytes8align* %a)
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ret void
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}
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; a..c -> r0..r2
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; d -> sp+0..sp+7
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define void @foo6(i32 %a, i32 %b, i32 %c, %struct8bytes8align* byval %d) {
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; CHECK-LABEL: foo6
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; CHECK: push {r11, lr}
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; CHECK: add r0, sp, #8
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; CHECK: bl usePtr
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; CHECK: pop {r11, lr}
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; CHECK: mov pc, lr
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call void @usePtr(%struct8bytes8align* %d)
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ret void
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}
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