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859ff3505c
SwiftTailCC has a different set of requirements than the C calling convention for a tail call. The exact argument sequence doesn't have to match, but fewer ABI-affecting attributes are allowed. Also make sure the musttail diagnostic triggers if a musttail call isn't actually a tail call.
231 lines
6.9 KiB
LLVM
231 lines
6.9 KiB
LLVM
; RUN: llc -verify-machineinstrs < %s -mtriple=aarch64-none-linux-gnu | FileCheck %s --check-prefixes=SDAG,COMMON
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; RUN: llc -global-isel -global-isel-abort=1 -verify-machineinstrs < %s -mtriple=aarch64-none-linux-gnu | FileCheck %s --check-prefixes=GISEL,COMMON
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declare swifttailcc void @callee_stack0()
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declare swifttailcc void @callee_stack8([8 x i64], i64)
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declare swifttailcc void @callee_stack16([8 x i64], i64, i64)
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declare extern_weak swifttailcc void @callee_weak()
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define swifttailcc void @caller_to0_from0() nounwind {
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; COMMON-LABEL: caller_to0_from0:
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; COMMON-NEXT: // %bb.
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musttail call swifttailcc void @callee_stack0()
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ret void
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; COMMON-NEXT: b callee_stack0
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}
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define swifttailcc void @caller_to0_from8([8 x i64], i64) {
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; COMMON-LABEL: caller_to0_from8:
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musttail call swifttailcc void @callee_stack0()
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ret void
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; COMMON: add sp, sp, #16
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; COMMON-NEXT: b callee_stack0
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}
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define swifttailcc void @caller_to8_from0() {
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; COMMON-LABEL: caller_to8_from0:
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; Key point is that the "42" should go #16 below incoming stack
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; pointer (we didn't have arg space to reuse).
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musttail call swifttailcc void @callee_stack8([8 x i64] undef, i64 42)
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ret void
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; COMMON: str {{x[0-9]+}}, [sp, #-16]!
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; COMMON-NEXT: b callee_stack8
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}
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define swifttailcc void @caller_to8_from8([8 x i64], i64 %a) {
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; COMMON-LABEL: caller_to8_from8:
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; COMMON-NOT: sub sp,
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; Key point is that the "%a" should go where at SP on entry.
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musttail call swifttailcc void @callee_stack8([8 x i64] undef, i64 42)
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ret void
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; COMMON: str {{x[0-9]+}}, [sp]
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; COMMON-NEXT: b callee_stack8
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}
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define swifttailcc void @caller_to16_from8([8 x i64], i64 %a) {
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; COMMON-LABEL: caller_to16_from8:
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; COMMON-NOT: sub sp,
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; Important point is that the call reuses the "dead" argument space
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; above %a on the stack. If it tries to go below incoming-SP then the
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; callee will not deallocate the space, even in swifttailcc.
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musttail call swifttailcc void @callee_stack16([8 x i64] undef, i64 42, i64 2)
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; COMMON: stp {{x[0-9]+}}, {{x[0-9]+}}, [sp]
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; COMMON-NEXT: b callee_stack16
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ret void
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}
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define swifttailcc void @caller_to8_from24([8 x i64], i64 %a, i64 %b, i64 %c) {
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; COMMON-LABEL: caller_to8_from24:
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; COMMON-NOT: sub sp,
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; Key point is that the "%a" should go where at #16 above SP on entry.
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musttail call swifttailcc void @callee_stack8([8 x i64] undef, i64 42)
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ret void
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; COMMON: str {{x[0-9]+}}, [sp, #16]!
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; COMMON-NEXT: b callee_stack8
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}
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define swifttailcc void @caller_to16_from16([8 x i64], i64 %a, i64 %b) {
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; COMMON-LABEL: caller_to16_from16:
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; COMMON-NOT: sub sp,
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; Here we want to make sure that both loads happen before the stores:
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; otherwise either %a or %b will be wrongly clobbered.
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musttail call swifttailcc void @callee_stack16([8 x i64] undef, i64 %b, i64 %a)
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ret void
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; COMMON: ldp {{x[0-9]+}}, {{x[0-9]+}}, [sp]
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; COMMON: stp {{x[0-9]+}}, {{x[0-9]+}}, [sp]
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; COMMON-NEXT: b callee_stack16
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}
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define swifttailcc void @disable_tail_calls() nounwind "disable-tail-calls"="true" {
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; COMMON-LABEL: disable_tail_calls:
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; COMMON-NEXT: // %bb.
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tail call swifttailcc void @callee_stack0()
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ret void
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; COMMON: bl callee_stack0
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; COMMON: ret
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}
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; Weakly-referenced extern functions cannot be tail-called, as AAELF does
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; not define the behaviour of branch instructions to undefined weak symbols.
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define swifttailcc void @caller_weak() {
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; COMMON-LABEL: caller_weak:
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; COMMON: bl callee_weak
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tail call void @callee_weak()
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ret void
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}
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declare { [2 x float] } @get_vec2()
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define { [3 x float] } @test_add_elem() {
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; SDAG-LABEL: test_add_elem:
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; SDAG: bl get_vec2
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; SDAG: fmov s2, #1.0
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; SDAG: ret
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; GISEL-LABEL: test_add_elem:
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; GISEL: str x30, [sp, #-16]!
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; GISEL: bl get_vec2
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; GISEL: fmov s2, #1.0
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; GISEL: ldr x30, [sp], #16
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; GISEL: ret
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%call = tail call { [2 x float] } @get_vec2()
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%arr = extractvalue { [2 x float] } %call, 0
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%arr.0 = extractvalue [2 x float] %arr, 0
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%arr.1 = extractvalue [2 x float] %arr, 1
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%res.0 = insertvalue { [3 x float] } undef, float %arr.0, 0, 0
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%res.01 = insertvalue { [3 x float] } %res.0, float %arr.1, 0, 1
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%res.012 = insertvalue { [3 x float] } %res.01, float 1.000000e+00, 0, 2
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ret { [3 x float] } %res.012
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}
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declare double @get_double()
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define { double, [2 x double] } @test_mismatched_insert() {
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; COMMON-LABEL: test_mismatched_insert:
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; COMMON: bl get_double
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; COMMON: bl get_double
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; COMMON: bl get_double
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; COMMON: ret
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%val0 = call double @get_double()
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%val1 = call double @get_double()
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%val2 = tail call double @get_double()
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%res.0 = insertvalue { double, [2 x double] } undef, double %val0, 0
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%res.01 = insertvalue { double, [2 x double] } %res.0, double %val1, 1, 0
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%res.012 = insertvalue { double, [2 x double] } %res.01, double %val2, 1, 1
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ret { double, [2 x double] } %res.012
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}
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define void @fromC_totail() {
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; COMMON-LABEL: fromC_totail:
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; COMMON: sub sp, sp, #48
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; COMMON-NOT: sub sp,
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; COMMON: mov w[[TMP:[0-9]+]], #42
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; COMMON: str x[[TMP]], [sp]
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; COMMON: bl callee_stack8
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; We must reset the stack to where it was before the call by undoing its extra stack pop.
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; COMMON: str x[[TMP]], [sp, #-16]!
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; COMMON: bl callee_stack8
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; COMMON: sub sp, sp, #16
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call swifttailcc void @callee_stack8([8 x i64] undef, i64 42)
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call swifttailcc void @callee_stack8([8 x i64] undef, i64 42)
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ret void
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}
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define void @fromC_totail_noreservedframe(i32 %len) {
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; COMMON-LABEL: fromC_totail_noreservedframe:
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; COMMON: stp x29, x30, [sp, #-48]!
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; COMMON: mov w[[TMP:[0-9]+]], #42
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; Note stack is subtracted here to allocate space for arg
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; COMMON: str x[[TMP]], [sp, #-16]!
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; COMMON: bl callee_stack8
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; And here.
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; COMMON: str x[[TMP]], [sp, #-16]!
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; COMMON: bl callee_stack8
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; But not restored here because callee_stack8 did that for us.
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; COMMON-NOT: sub sp,
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; Variable sized allocation prevents reserving frame at start of function so each call must allocate any stack space it needs.
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%var = alloca i32, i32 %len
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call swifttailcc void @callee_stack8([8 x i64] undef, i64 42)
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call swifttailcc void @callee_stack8([8 x i64] undef, i64 42)
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ret void
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}
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declare void @Ccallee_stack8([8 x i64], i64)
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define swifttailcc void @fromtail_toC() {
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; COMMON-LABEL: fromtail_toC:
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; COMMON: sub sp, sp, #32
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; COMMON-NOT: sub sp,
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; COMMON: mov w[[TMP:[0-9]+]], #42
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; COMMON: str x[[TMP]], [sp]
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; COMMON: bl Ccallee_stack8
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; C callees will return with the stack exactly where we left it, so we mustn't try to fix anything.
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; COMMON-NOT: add sp,
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; COMMON-NOT: sub sp,
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; COMMON: str x[[TMP]], [sp]{{$}}
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; COMMON: bl Ccallee_stack8
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; COMMON-NOT: sub sp,
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call void @Ccallee_stack8([8 x i64] undef, i64 42)
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call void @Ccallee_stack8([8 x i64] undef, i64 42)
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ret void
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}
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declare swifttailcc i8* @SwiftSelf(i8 * swiftasync %context, i8* swiftself %closure)
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define swiftcc i8* @CallSwiftSelf(i8* swiftself %closure, i8* %context) {
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; CHECK-LABEL: CallSwiftSelf:
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; CHECK: stp x20
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;call void asm "","~{r13}"() ; We get a push r13 but why not with the call
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; below?
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%res = call swifttailcc i8* @SwiftSelf(i8 * swiftasync %context, i8* swiftself %closure)
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ret i8* %res
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}
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