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[X86] Add SHRD shift combine tests 

llvm-svn: 276568
This commit is contained in:
Simon Pilgrim 2016-07-24 15:47:44 +00:00
parent 0ededcb344
commit b2df2dc298
1 changed files with 36 additions and 0 deletions
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36
llvm/test/CodeGen/X86/shift-double.ll
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@ -109,3 +109,39 @@ define i16 @test5(i16 %A, i16 %B, i8 %C) nounwind {
ret i16 %Z ret i16 %Z
} }
; Combine 2xi32/2xi16 shifts into SHRD
define i32 @test6(i32 %A, i32 %B, i8 %C) nounwind {
; CHECK-LABEL: test6:
; CHECK: # BB#0:
; CHECK-NEXT: movb {{[0-9]+}}(%esp), %cl
; CHECK-NEXT: movl {{[0-9]+}}(%esp), %edx
; CHECK-NEXT: movl {{[0-9]+}}(%esp), %eax
; CHECK-NEXT: shrdl %cl, %edx, %eax
; CHECK-NEXT: retl
%shift.upgrd.4 = zext i8 %C to i32 ; <i32> [#uses=1]
%X = lshr i32 %A, %shift.upgrd.4 ; <i32> [#uses=1]
%Cv = sub i8 32, %C ; <i8> [#uses=1]
%shift.upgrd.5 = zext i8 %Cv to i32 ; <i32> [#uses=1]
%Y = shl i32 %B, %shift.upgrd.5 ; <i32> [#uses=1]
%Z = or i32 %Y, %X ; <i32> [#uses=1]
ret i32 %Z
}
define i16 @test7(i16 %A, i16 %B, i8 %C) nounwind {
; CHECK-LABEL: test7:
; CHECK: # BB#0:
; CHECK-NEXT: movb {{[0-9]+}}(%esp), %cl
; CHECK-NEXT: movzwl {{[0-9]+}}(%esp), %edx
; CHECK-NEXT: movzwl {{[0-9]+}}(%esp), %eax
; CHECK-NEXT: shrdw %cl, %dx, %ax
; CHECK-NEXT: retl
%shift.upgrd.6 = zext i8 %C to i16 ; <i16> [#uses=1]
%X = lshr i16 %A, %shift.upgrd.6 ; <i16> [#uses=1]
%Cv = sub i8 16, %C ; <i8> [#uses=1]
%shift.upgrd.7 = zext i8 %Cv to i16 ; <i16> [#uses=1]
%Y = shl i16 %B, %shift.upgrd.7 ; <i16> [#uses=1]
%Z = or i16 %Y, %X ; <i16> [#uses=1]
ret i16 %Z
}