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[X86] Add test for rotate combining when add X, X is used instead of shl X, 1. NFC 

llvm-svn: 370203
This commit is contained in:
Amaury Sechet 2019-08-28 13:52:32 +00:00
parent 2dddf3e4ff
commit 3b44c36b29
2 changed files with 37 additions and 0 deletions
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14
llvm/test/CodeGen/X86/rotate-extract-vector.ll
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@ -280,3 +280,17 @@ define <2 x i64> @no_extract_udiv(<2 x i64> %i) nounwind {
%out = or <2 x i64> %lhs_shift, %rhs_div %out = or <2 x i64> %lhs_shift, %rhs_div
ret <2 x i64> %out ret <2 x i64> %out
} }
; DAGCombiner transforms shl X, 1 into add X, X.
define <4 x i32> @extract_add_1(<4 x i32> %i) nounwind {
; CHECK-LABEL: extract_add_1:
; CHECK: # %bb.0:
; CHECK-NEXT: vpaddd %xmm0, %xmm0, %xmm1
; CHECK-NEXT: vpsrld $31, %xmm0, %xmm0
; CHECK-NEXT: vpor %xmm0, %xmm1, %xmm0
; CHECK-NEXT: ret{{[l|q]}}
%ii = add <4 x i32> %i, %i
%rhs = lshr <4 x i32> %i, <i32 31, i32 31, i32 31, i32 31>
%out = or <4 x i32> %ii, %rhs
ret <4 x i32> %out
}

23
llvm/test/CodeGen/X86/rotate-extract.ll
View File

@ -265,3 +265,26 @@ define i8 @no_extract_udiv(i8 %i) nounwind {
%out = or i8 %lhs_shift, %rhs_div %out = or i8 %lhs_shift, %rhs_div
ret i8 %out ret i8 %out
} }
; DAGCombiner transforms shl X, 1 into add X, X.
define i32 @extract_add_1(i32 %i) nounwind {
; X86-LABEL: extract_add_1:
; X86: # %bb.0:
; X86-NEXT: movl {{[0-9]+}}(%esp), %ecx
; X86-NEXT: leal (%ecx,%ecx), %eax
; X86-NEXT: shrl $31, %ecx
; X86-NEXT: orl %ecx, %eax
; X86-NEXT: retl
;
; X64-LABEL: extract_add_1:
; X64: # %bb.0:
; X64-NEXT: # kill: def $edi killed $edi def $rdi
; X64-NEXT: leal (%rdi,%rdi), %eax
; X64-NEXT: shrl $31, %edi
; X64-NEXT: orl %edi, %eax
; X64-NEXT: retq
%ii = add i32 %i, %i
%rhs = lshr i32 %i, 31
%out = or i32 %ii, %rhs
ret i32 %out
}