llvm/test/CodeGen/R600/sdiv.ll

; RUN: llc -march=r600 -mcpu=SI < %s | FileCheck -check-prefix=SI -check-prefix=FUNC %s
; RUN: llc -march=r600 -mcpu=redwood < %s | FileCheck -check-prefix=EG -check-prefix=FUNC %s

; The code generated by sdiv is long and complex and may frequently change.
; The goal of this test is to make sure the ISel doesn't fail.
;
; This program was previously failing to compile when one of the selectcc
; opcodes generated by the sdiv lowering was being legalized and optimized to:
; selectcc Remainder -1, 0, -1, SETGT
; This was fixed by adding an additional pattern in R600Instructions.td to
; match this pattern with a CNDGE_INT.

; FUNC-LABEL: @sdiv_i32
; EG: CF_END
define void @sdiv_i32(i32 addrspace(1)* %out, i32 addrspace(1)* %in) {
  %den_ptr = getelementptr i32 addrspace(1)* %in, i32 1
  %num = load i32 addrspace(1) * %in
  %den = load i32 addrspace(1) * %den_ptr
  %result = sdiv i32 %num, %den
  store i32 %result, i32 addrspace(1)* %out
  ret void
}

; FUNC-LABEL: @sdiv_i32_4
define void @sdiv_i32_4(i32 addrspace(1)* %out, i32 addrspace(1)* %in) {
  %num = load i32 addrspace(1) * %in
  %result = sdiv i32 %num, 4
  store i32 %result, i32 addrspace(1)* %out
  ret void
}

; Multiply by a weird constant to make sure setIntDivIsCheap is
; working.

; FUNC-LABEL: @slow_sdiv_i32_3435
; SI: BUFFER_LOAD_DWORD [[VAL:v[0-9]+]],
; SI: V_MOV_B32_e32 [[MAGIC:v[0-9]+]], 0x98a1930b
; SI: V_MUL_HI_I32 [[TMP:v[0-9]+]], [[VAL]], [[MAGIC]]
; SI: V_ADD_I32
; SI: V_LSHRREV_B32
; SI: V_ASHRREV_I32
; SI: V_ADD_I32
; SI: BUFFER_STORE_DWORD
; SI: S_ENDPGM
define void @slow_sdiv_i32_3435(i32 addrspace(1)* %out, i32 addrspace(1)* %in) {
  %num = load i32 addrspace(1) * %in
  %result = sdiv i32 %num, 3435
  store i32 %result, i32 addrspace(1)* %out
  ret void
}

; Tests for 64-bit divide bypass.
; define void @test_get_quotient(i64 addrspace(1)* %out, i64 %a, i64 %b) nounwind {
;   %result = sdiv i64 %a, %b
;   store i64 %result, i64 addrspace(1)* %out, align 8
;   ret void
; }

; define void @test_get_remainder(i64 addrspace(1)* %out, i64 %a, i64 %b) nounwind {
;   %result = srem i64 %a, %b
;   store i64 %result, i64 addrspace(1)* %out, align 8
;   ret void
; }

; define void @test_get_quotient_and_remainder(i64 addrspace(1)* %out, i64 %a, i64 %b) nounwind {
;   %resultdiv = sdiv i64 %a, %b
;   %resultrem = srem i64 %a, %b
;   %result = add i64 %resultdiv, %resultrem
;   store i64 %result, i64 addrspace(1)* %out, align 8
;   ret void
; }