diff options
Diffstat (limited to 'llvm/test/CodeGen/X86/bmi.ll')
| -rw-r--r-- | llvm/test/CodeGen/X86/bmi.ll | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/llvm/test/CodeGen/X86/bmi.ll b/llvm/test/CodeGen/X86/bmi.ll index ad436435af2..a9f7ec5b3a3 100644 --- a/llvm/test/CodeGen/X86/bmi.ll +++ b/llvm/test/CodeGen/X86/bmi.ll @@ -822,13 +822,13 @@ define i64 @blsr_disguised_constant(i64 %x) { ret i64 %r } -; The add here gets shrunk, but the and does not thus hiding the blsr pattern. +; The add here used to get shrunk, but the and did not thus hiding the blsr pattern. +; We now use the knowledge that upper bits of the shift guarantee the and result has 0s in the upper bits to reduce it too. define i64 @blsr_disguised_shrunk_add(i64 %x) { ; CHECK-LABEL: blsr_disguised_shrunk_add: ; CHECK: # %bb.0: ; CHECK-NEXT: shrq $48, %rdi -; CHECK-NEXT: leal -1(%rdi), %eax -; CHECK-NEXT: andq %rdi, %rax +; CHECK-NEXT: blsrl %edi, %eax ; CHECK-NEXT: retq %a = lshr i64 %x, 48 %b = add i64 %a, -1 |
