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Diffstat (limited to 'test/CodeGen/X86/bswap-rotate.ll')
| -rw-r--r-- | test/CodeGen/X86/bswap-rotate.ll | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/test/CodeGen/X86/bswap-rotate.ll b/test/CodeGen/X86/bswap-rotate.ll new file mode 100644 index 000000000000..f686febe5645 --- /dev/null +++ b/test/CodeGen/X86/bswap-rotate.ll @@ -0,0 +1,27 @@ +; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py +; RUN: llc < %s -mtriple=i686-unknown-unknown -mcpu=i686 | FileCheck %s --check-prefix=X86 +; RUN: llc < %s -mtriple=x86_64-unknown-unknown | FileCheck %s --check-prefix=X64 + +; Combine BSWAP (lowered to rolw 8) with a second rotate. +; This test checks for combining rotates with inconsistent constant value types. + +define i16 @combine_bswap_rotate(i16 %a0) { +; X86-LABEL: combine_bswap_rotate: +; X86: # BB#0: +; X86-NEXT: movzwl {{[0-9]+}}(%esp), %eax +; X86-NEXT: rolw $9, %ax +; X86-NEXT: retl +; +; X64-LABEL: combine_bswap_rotate: +; X64: # BB#0: +; X64-NEXT: rolw $9, %di +; X64-NEXT: movl %edi, %eax +; X64-NEXT: retq + %1 = call i16 @llvm.bswap.i16(i16 %a0) + %2 = shl i16 %1, 1 + %3 = lshr i16 %1, 15 + %4 = or i16 %2, %3 + ret i16 %4 +} + +declare i16 @llvm.bswap.i16(i16) |