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llvm-6502/test/CodeGen/ARM/tail-call.ll

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Model ARM backend ABI selection after the front end code doing the same. This will change the "bare metal" ABI from APCS to AAPCS. The only difference between the front and back end code is that the code for Triple::GNU was added for environment. That will migrate to the front end shortly. Tests updated with the ABI they were originally testing in the case of bare metal (e.g. -mtriple armv7) or with a -gnu for arm-linux triples. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224489 91177308-0d34-0410-b5e6-96231b3b80d8
2014-12-18 02:08:45 +00:00
; RUN: llc -mtriple armv7 -mattr=apcs -O0 -o - < %s \
; RUN: | FileCheck %s -check-prefix CHECK-TAIL
; RUN: llc -mtriple armv7 -mattr=apcs -O0 -disable-tail-calls -o - < %s \
ARM: honour -f{no-,}optimize-sibling-calls Use the options in the ARMISelLowering to control whether tail calls are optimised or not. Previously, this option was entirely ignored on the ARM target and only honoured on x86. This option is mostly useful in profiling scenarios. The default remains that tail call optimisations will be applied. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203577 91177308-0d34-0410-b5e6-96231b3b80d8
2014-03-11 15:09:54 +00:00
; RUN: | FileCheck %s -check-prefix CHECK-NO-TAIL
declare i32 @callee(i32 %i)
[ARM,AArch64] Do not tail-call to an externally-defined function with weak linkage Externally-defined functions with weak linkage should not be tail-called on ARM or AArch64, as the AAELF spec requires normal calls to undefined weak functions to be replaced with a NOP or jump to the next instruction. The behaviour of branch instructions in this situation (as used for tail calls) is implementation-defined, so we cannot rely on the linker replacing the tail call with a return. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215890 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-18 12:42:15 +00:00
declare extern_weak fastcc void @callee_weak()
ARM: honour -f{no-,}optimize-sibling-calls Use the options in the ARMISelLowering to control whether tail calls are optimised or not. Previously, this option was entirely ignored on the ARM target and only honoured on x86. This option is mostly useful in profiling scenarios. The default remains that tail call optimisations will be applied. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203577 91177308-0d34-0410-b5e6-96231b3b80d8
2014-03-11 15:09:54 +00:00
define i32 @caller(i32 %i) {
entry:
%r = tail call i32 @callee(i32 %i)
ret i32 %r
}
test: fix CHECK lines Thanks to gix for pointing out that the CHECK-LABEL lines were incorrect! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204700 91177308-0d34-0410-b5e6-96231b3b80d8
2014-03-25 03:39:39 +00:00
; CHECK-TAIL-LABEL: caller
ARM: honour -f{no-,}optimize-sibling-calls Use the options in the ARMISelLowering to control whether tail calls are optimised or not. Previously, this option was entirely ignored on the ARM target and only honoured on x86. This option is mostly useful in profiling scenarios. The default remains that tail call optimisations will be applied. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203577 91177308-0d34-0410-b5e6-96231b3b80d8
2014-03-11 15:09:54 +00:00
; CHECK-TAIL: b callee
test: fix CHECK lines Thanks to gix for pointing out that the CHECK-LABEL lines were incorrect! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204700 91177308-0d34-0410-b5e6-96231b3b80d8
2014-03-25 03:39:39 +00:00
; CHECK-NO-TAIL-LABEL: caller
ARM: honour -f{no-,}optimize-sibling-calls Use the options in the ARMISelLowering to control whether tail calls are optimised or not. Previously, this option was entirely ignored on the ARM target and only honoured on x86. This option is mostly useful in profiling scenarios. The default remains that tail call optimisations will be applied. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203577 91177308-0d34-0410-b5e6-96231b3b80d8
2014-03-11 15:09:54 +00:00
; CHECK-NO-TAIL: push {lr}
; CHECK-NO-TAIL: bl callee
; CHECK-NO-TAIL: pop {lr}
; CHECK-NO-TAIL: bx lr
[ARM,AArch64] Do not tail-call to an externally-defined function with weak linkage Externally-defined functions with weak linkage should not be tail-called on ARM or AArch64, as the AAELF spec requires normal calls to undefined weak functions to be replaced with a NOP or jump to the next instruction. The behaviour of branch instructions in this situation (as used for tail calls) is implementation-defined, so we cannot rely on the linker replacing the tail call with a return. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215890 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-18 12:42:15 +00:00
; Weakly-referenced extern functions cannot be tail-called, as AAELF does
; not define the behaviour of branch instructions to undefined weak symbols.
define fastcc void @caller_weak() {
; CHECK-LABEL: caller_weak:
; CHECK: bl callee_weak
tail call void @callee_weak()
ret void
}
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