blob: d525448b60ca8f891f7950fa047cdd6276006910 [file] [log] [blame]
; RUN: llc -mtriple=x86_64-unknown-linux-gnu -relocation-model=pic < %s | FileCheck %s
; RUN: llc -mtriple=x86_64-freebsd -relocation-model=pic < %s | FileCheck %s
;; According to x86-64 psABI, xmm0-xmm7 can be used to pass function parameters.
;; However regcall calling convention uses also xmm8-xmm15 to pass function
;; parameters which violates x86-64 psABI.
;; Detail info about it can be found at:
;; We encounter the violation symptom when using PIC with lazy binding
;; optimization.
;; In that case the PLT mechanism as described in x86_64 psABI will
;; not preserve xmm8-xmm15 registers and will lead to miscompilation.
;; The agreed solution is to disable PLT for regcall calling convention for
;; SystemV using ELF format.
declare void @lazy()
declare x86_regcallcc void @regcall_not_lazy()
; CHECK: callq lazy@PLT
; CHECK: callq *regcall_not_lazy@GOTPCREL(%rip)
define void @foo() nounwind {
call void @lazy()
call void @regcall_not_lazy()
ret void
; CHECK-LABEL: tail_call_regcall:
; CHECK: jmpq *regcall_not_lazy@GOTPCREL(%rip)
define void @tail_call_regcall() nounwind {
tail call void @regcall_not_lazy()
ret void
; CHECK-LABEL: tail_call_regular:
; CHECK: jmp lazy
define void @tail_call_regular() nounwind {
tail call void @lazy()
ret void