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fc5daa6083
Swift's new concurrency features are going to require guaranteed tail calls so that they don't consume excessive amounts of stack space. This would normally mean "tailcc", but there are also Swift-specific ABI desires that don't naturally go along with "tailcc" so this adds another calling convention that's the combination of "swiftcc" and "tailcc". Support is added for AArch64 and X86 for now.
175 lines
4.7 KiB
LLVM
175 lines
4.7 KiB
LLVM
; RUN: llc -mtriple=arm64-apple-ios %s -o - | FileCheck %s --check-prefixes=CHECK-NOAUTH,CHECK
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; RUN: llc -mtriple=arm64-apple-ios -mcpu=apple-a13 %s -o - | FileCheck %s --check-prefixes=CHECK-NOAUTH,CHECK
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; RUN: llc -mtriple=arm64e-apple-ios %s -o - | FileCheck %s --check-prefixes=CHECK-AUTH,CHECK
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; Important details in prologue:
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; * x22 is stored just below x29
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; * Enough stack space is allocated for everything
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define swifttailcc void @simple(i8* swiftasync %ctx) "frame-pointer"="all" {
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; CHECK-LABEL: simple:
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; CHECK: orr x29, x29, #0x100000000000000
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; CHECK: sub sp, sp, #32
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; CHECK: stp x29, x30, [sp, #16]
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; CHECK-NOAUTH: str x22, [sp, #8]
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; CHECK-AUTH: add x16, sp, #8
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; CHECK-AUTH: movk x16, #49946, lsl #48
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; CHECK-AUTH: mov x17, x22
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; CHECK-AUTH: pacdb x17, x16
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; CHECK-AUTH: str x17, [sp, #8]
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; CHECK: add x29, sp, #16
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; CHECK: .cfi_def_cfa w29, 16
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; CHECK: .cfi_offset w30, -8
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; CHECK: .cfi_offset w29, -16
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;[...]
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; CHECK: ldp x29, x30, [sp, #16]
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; CHECK: and x29, x29, #0xefffffffffffffff
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; CHECK: add sp, sp, #32
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ret void
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}
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define swifttailcc void @more_csrs(i8* swiftasync %ctx) "frame-pointer"="all" {
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; CHECK-LABEL: more_csrs:
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; CHECK: orr x29, x29, #0x100000000000000
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; CHECK: str x23, [sp, #-32]!
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; CHECK: stp x29, x30, [sp, #16]
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; CHECK-NOAUTH: str x22, [sp, #8]
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; CHECK-AUTH: add x16, sp, #8
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; CHECK-AUTH: movk x16, #49946, lsl #48
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; CHECK-AUTH: mov x17, x22
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; CHECK-AUTH: pacdb x17, x16
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; CHECK-AUTH: str x17, [sp, #8]
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; CHECK: add x29, sp, #16
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; CHECK: .cfi_def_cfa w29, 16
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; CHECK: .cfi_offset w30, -8
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; CHECK: .cfi_offset w29, -16
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; CHECK: .cfi_offset w23, -32
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; [...]
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; CHECK: ldp x29, x30, [sp, #16]
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; CHECK: ldr x23, [sp], #32
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; CHECK: and x29, x29, #0xefffffffffffffff
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call void asm sideeffect "", "~{x23}"()
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ret void
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}
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define swifttailcc void @locals(i8* swiftasync %ctx) "frame-pointer"="all" {
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; CHECK-LABEL: locals:
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; CHECK: orr x29, x29, #0x100000000000000
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; CHECK: sub sp, sp, #64
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; CHECK: stp x29, x30, [sp, #48]
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; CHECK-NOAUTH: str x22, [sp, #40]
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; CHECK-AUTH: add x16, sp, #40
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; CHECK-AUTH: movk x16, #49946, lsl #48
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; CHECK-AUTH: mov x17, x22
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; CHECK-AUTH: pacdb x17, x16
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; CHECK-AUTH: str x17, [sp, #40]
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; CHECK: add x29, sp, #48
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; CHECK: .cfi_def_cfa w29, 16
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; CHECK: .cfi_offset w30, -8
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; CHECK: .cfi_offset w29, -16
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; CHECK: mov x0, sp
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; CHECK: bl _bar
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; [...]
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; CHECK: ldp x29, x30, [sp, #48]
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; CHECK: and x29, x29, #0xefffffffffffffff
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; CHECK: add sp, sp, #64
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%var = alloca i32, i32 10
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call void @bar(i32* %var)
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ret void
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}
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define swifttailcc void @use_input_context(i8* swiftasync %ctx, i8** %ptr) "frame-pointer"="all" {
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; CHECK-LABEL: use_input_context:
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; CHECK-NOAUTH: str x22, [sp
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; CHECK-AUTH: mov x17, x22
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; CHECK-NOT: x22
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; CHECK: str x22, [x0]
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store i8* %ctx, i8** %ptr
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ret void
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}
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define swifttailcc i8** @context_in_func() "frame-pointer"="non-leaf" {
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; CHECK-LABEL: context_in_func:
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; CHECK-NOAUTH: str xzr, [sp, #8]
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; CHECK-AUTH: add x16, sp, #8
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; CHECK-AUTH: movk x16, #49946, lsl #48
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; CHECK-AUTH: mov x17, xzr
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; CHECK-AUTH: pacdb x17, x16
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; CHECK-AUTH: str x17, [sp, #8]
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%ptr = call i8** @llvm.swift.async.context.addr()
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ret i8** %ptr
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}
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define swifttailcc void @write_frame_context(i8* swiftasync %ctx, i8* %newctx) "frame-pointer"="non-leaf" {
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; CHECK-LABEL: write_frame_context:
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; CHECK: sub x[[ADDR:[0-9]+]], x29, #8
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; CHECK: str x0, [x[[ADDR]]]
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%ptr = call i8** @llvm.swift.async.context.addr()
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store i8* %newctx, i8** %ptr
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ret void
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}
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define swifttailcc void @simple_fp_elim(i8* swiftasync %ctx) "frame-pointer"="non-leaf" {
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; CHECK-LABEL: simple_fp_elim:
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; CHECK-NOT: orr x29, x29, #0x100000000000000
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ret void
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}
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define swifttailcc void @large_frame(i8* swiftasync %ctx) "frame-pointer"="all" {
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; CHECK-LABEL: large_frame:
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; CHECK: str x28, [sp, #-32]!
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; CHECK: stp x29, x30, [sp, #16]
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; CHECK-NOAUTH: str x22, [sp, #8]
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; CHECK: add x29, sp, #16
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; CHECK: sub sp, sp, #1024
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; [...]
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; CHECK: add sp, sp, #1024
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; CHECK: ldp x29, x30, [sp, #16]
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; CHECK: ldr x28, [sp], #32
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; CHECK: ret
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%var = alloca i8, i32 1024
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ret void
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}
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; Important point is that there is just one 8-byte gap in the CSR region (right
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; now just above d8) to realign the stack.
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define swifttailcc void @two_unpaired_csrs(i8* swiftasync) "frame-pointer"="all" {
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; CHECK-LABEL: two_unpaired_csrs:
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; CHECK: str d8, [sp, #-48]!
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; CHECK: str x19, [sp, #16]
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; CHECK: stp x29, x30, [sp, #32]
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; CHECK-NOAUTH: str x22, [sp, #24]
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; CHECK: add x29, sp, #32
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; CHECK: .cfi_def_cfa w29, 16
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; CHECK: .cfi_offset w30, -8
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; CHECK: .cfi_offset w29, -16
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; CHECK: .cfi_offset w19, -32
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; CHECK: .cfi_offset b8, -48
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call void asm "","~{x19},~{d8}"()
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call swifttailcc void @bar(i32* undef)
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ret void
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}
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declare swifttailcc void @bar(i32*)
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declare i8** @llvm.swift.async.context.addr()
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