| ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py |
| ; RUN: llc < %s -mtriple=i686-unknown-unknown | FileCheck %s |
| ; RUN: llc < %s -mtriple=x86_64-unknown-unknown | FileCheck %s --check-prefix=CHECK64 |
| |
| ; Check reconstructing bswap from shifted masks and tree of ORs |
| |
| ; Match a 32-bit packed halfword bswap. That is |
| ; ((x & 0x000000ff) << 8) | |
| ; ((x & 0x0000ff00) >> 8) | |
| ; ((x & 0x00ff0000) << 8) | |
| ; ((x & 0xff000000) >> 8) |
| ; => (rotl (bswap x), 16) |
| define i32 @test1(i32 %x) nounwind { |
| ; CHECK-LABEL: test1: |
| ; CHECK: # %bb.0: |
| ; CHECK-NEXT: movl {{[0-9]+}}(%esp), %eax |
| ; CHECK-NEXT: bswapl %eax |
| ; CHECK-NEXT: roll $16, %eax |
| ; CHECK-NEXT: retl |
| ; |
| ; CHECK64-LABEL: test1: |
| ; CHECK64: # %bb.0: |
| ; CHECK64-NEXT: bswapl %edi |
| ; CHECK64-NEXT: roll $16, %edi |
| ; CHECK64-NEXT: movl %edi, %eax |
| ; CHECK64-NEXT: retq |
| %byte0 = and i32 %x, 255 ; 0x000000ff |
| %byte1 = and i32 %x, 65280 ; 0x0000ff00 |
| %byte2 = and i32 %x, 16711680 ; 0x00ff0000 |
| %byte3 = and i32 %x, 4278190080 ; 0xff000000 |
| %tmp0 = shl i32 %byte0, 8 |
| %tmp1 = lshr i32 %byte1, 8 |
| %tmp2 = shl i32 %byte2, 8 |
| %tmp3 = lshr i32 %byte3, 8 |
| %or0 = or i32 %tmp0, %tmp1 |
| %or1 = or i32 %tmp2, %tmp3 |
| %result = or i32 %or0, %or1 |
| ret i32 %result |
| } |
| |
| ; the same as test1, just shifts before the "and" |
| ; ((x << 8) & 0x0000ff00) | |
| ; ((x >> 8) & 0x000000ff) | |
| ; ((x << 8) & 0xff000000) | |
| ; ((x >> 8) & 0x00ff0000) |
| define i32 @test2(i32 %x) nounwind { |
| ; CHECK-LABEL: test2: |
| ; CHECK: # %bb.0: |
| ; CHECK-NEXT: movl {{[0-9]+}}(%esp), %eax |
| ; CHECK-NEXT: bswapl %eax |
| ; CHECK-NEXT: roll $16, %eax |
| ; CHECK-NEXT: retl |
| ; |
| ; CHECK64-LABEL: test2: |
| ; CHECK64: # %bb.0: |
| ; CHECK64-NEXT: bswapl %edi |
| ; CHECK64-NEXT: roll $16, %edi |
| ; CHECK64-NEXT: movl %edi, %eax |
| ; CHECK64-NEXT: retq |
| %byte1 = shl i32 %x, 8 |
| %byte0 = lshr i32 %x, 8 |
| %byte3 = shl i32 %x, 8 |
| %byte2 = lshr i32 %x, 8 |
| %tmp1 = and i32 %byte1, 65280 ; 0x0000ff00 |
| %tmp0 = and i32 %byte0, 255 ; 0x000000ff |
| %tmp3 = and i32 %byte3, 4278190080 ; 0xff000000 |
| %tmp2 = and i32 %byte2, 16711680 ; 0x00ff0000 |
| %or0 = or i32 %tmp0, %tmp1 |
| %or1 = or i32 %tmp2, %tmp3 |
| %result = or i32 %or0, %or1 |
| ret i32 %result |
| } |