third_party/llvm-7.0/llvm/test/CodeGen/ARM/gpr-paired-spill.ll

; RUN: llc -mtriple=armv7-none-linux-gnueabi -verify-machineinstrs < %s | FileCheck %s --check-prefix=CHECK-WITH-LDRD
; RUN: llc -mtriple=armv4-none-linux-gnueabi -verify-machineinstrs < %s | FileCheck %s --check-prefix=CHECK-WITHOUT-LDRD
; RUN: llc -mtriple=thumbv7-none-linux-gnueabi -verify-machineinstrs < %s | FileCheck %s --check-prefix=CHECK-WITH-LDRD

define void @foo(i64* %addr) {
  %val1 = tail call i64 asm sideeffect "ldrexd $0, ${0:H}, [r0]", "=&r,r"(i64* %addr)
  %val2 = tail call i64 asm sideeffect "ldrexd $0, ${0:H}, [r0]", "=&r,r"(i64* %addr)
  %val3 = tail call i64 asm sideeffect "ldrexd $0, ${0:H}, [r0]", "=&r,r"(i64* %addr)
  %val4 = tail call i64 asm sideeffect "ldrexd $0, ${0:H}, [r0]", "=&r,r"(i64* %addr)
  %val5 = tail call i64 asm sideeffect "ldrexd $0, ${0:H}, [r0]", "=&r,r"(i64* %addr)
  %val6 = tail call i64 asm sideeffect "ldrexd $0, ${0:H}, [r0]", "=&r,r"(i64* %addr)
  %val7 = tail call i64 asm sideeffect "ldrexd $0, ${0:H}, [r0]", "=&r,r"(i64* %addr)

  ; Key point is that enough 64-bit paired GPR values are live that
  ; one of them has to be spilled. This used to cause an abort because
  ; an LDMIA was created with both a FrameIndex and an offset, which
  ; is not allowed.

; CHECK-WITH-LDRD-DAG: strd {{r[0-9]+}}, {{r[0-9]+}}, [sp, #8]
; CHECK-WITH-LDRD-DAG: strd {{r[0-9]+}}, {{r[0-9]+}}, [sp]

; CHECK-WITH-LDRD-DAG: ldrd {{r[0-9]+}}, {{r[0-9]+}}, [sp, #8]
; CHECK-WITH-LDRD-DAG: ldrd {{r[0-9]+}}, {{r[0-9]+}}, [sp]

  ; We also want to ensure the register scavenger is working (i.e. an
  ; offset from sp can be generated), so we need two spills.
; CHECK-WITHOUT-LDRD-DAG: add [[ADDRREG:[a-z0-9]+]], sp, #{{[0-9]+}}
; CHECK-WITHOUT-LDRD-DAG: stm [[ADDRREG]], {r{{[0-9]+}}, r{{[0-9]+}}}
; CHECK-WITHOUT-LDRD-DAG: stm sp, {r{{[0-9]+}}, r{{[0-9]+}}}

  ; In principle LLVM may have to recalculate the offset. At the moment
  ; it reuses the original though.
; CHECK-WITHOUT-LDRD-DAG: ldm [[ADDRREG]], {r{{[0-9]+}}, r{{[0-9]+}}}
; CHECK-WITHOUT-LDRD-DAG: ldm sp, {r{{[0-9]+}}, r{{[0-9]+}}}

  store volatile i64 %val1, i64* %addr
  store volatile i64 %val2, i64* %addr
  store volatile i64 %val3, i64* %addr
  store volatile i64 %val4, i64* %addr
  store volatile i64 %val5, i64* %addr
  store volatile i64 %val6, i64* %addr
  store volatile i64 %val7, i64* %addr
  ret void
}