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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.
158 lines
4.6 KiB
LLVM
158 lines
4.6 KiB
LLVM
; RUN: llc -verify-machineinstrs < %s -mtriple=aarch64-none-linux-gnu -tailcallopt | 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 -tailcallopt | FileCheck %s --check-prefixes=GISEL,COMMON
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declare fastcc void @callee_stack0()
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declare fastcc void @callee_stack8([8 x i64], i64)
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declare fastcc void @callee_stack16([8 x i64], i64, i64)
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declare extern_weak fastcc void @callee_weak()
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define fastcc 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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tail call fastcc 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 fastcc void @caller_to0_from8([8 x i64], i64) {
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; COMMON-LABEL: caller_to0_from8:
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tail call fastcc 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 fastcc 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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tail call fastcc 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 fastcc 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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tail call fastcc 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 fastcc 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 fastcc.
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tail call fastcc 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 fastcc 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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tail call fastcc 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 fastcc 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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tail call fastcc 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 fastcc 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 fastcc 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 fastcc 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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