llvm-6502/test/CodeGen/AMDGPU/bfe_uint.ll
Tom Stellard 953c681473 R600 -> AMDGPU rename
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@239657 91177308-0d34-0410-b5e6-96231b3b80d8
2015-06-13 03:28:10 +00:00

27 lines
756 B
LLVM

; RUN: llc < %s -march=r600 -mcpu=redwood | FileCheck %s
; CHECK: {{^}}bfe_def:
; CHECK: BFE_UINT
define void @bfe_def(i32 addrspace(1)* %out, i32 %x) {
entry:
%0 = lshr i32 %x, 5
%1 = and i32 %0, 15 ; 0xf
store i32 %1, i32 addrspace(1)* %out
ret void
}
; This program could be implemented using a BFE_UINT instruction, however
; since the lshr constant + number of bits in the mask is >= 32, it can also be
; implmented with a LSHR instruction, which is better, because LSHR has less
; operands and requires less constants.
; CHECK: {{^}}bfe_shift:
; CHECK-NOT: BFE_UINT
define void @bfe_shift(i32 addrspace(1)* %out, i32 %x) {
entry:
%0 = lshr i32 %x, 16
%1 = and i32 %0, 65535 ; 0xffff
store i32 %1, i32 addrspace(1)* %out
ret void
}