[llvm] r276568 - [X86] Add SHRD shift combine tests
Simon Pilgrim via llvm-commits
llvm-commits at lists.llvm.org
Sun Jul 24 08:47:45 PDT 2016
Author: rksimon
Date: Sun Jul 24 10:47:44 2016
New Revision: 276568
URL: http://llvm.org/viewvc/llvm-project?rev=276568&view=rev
Log:
[X86] Add SHRD shift combine tests
Modified:
llvm/trunk/test/CodeGen/X86/shift-double.ll
Modified: llvm/trunk/test/CodeGen/X86/shift-double.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/X86/shift-double.ll?rev=276568&r1=276567&r2=276568&view=diff
==============================================================================
--- llvm/trunk/test/CodeGen/X86/shift-double.ll (original)
+++ llvm/trunk/test/CodeGen/X86/shift-double.ll Sun Jul 24 10:47:44 2016
@@ -109,3 +109,39 @@ define i16 @test5(i16 %A, i16 %B, i8 %C)
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
+}
+
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