[SparcV9]: Use SRL instead of SLL to clear top 32-bits in ctpop:i32. SLL does not...

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@198280 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/Sparc/SparcInstrInfo.td b/lib/Target/Sparc/SparcInstrInfo.td
index 12a0962cac1c2edfae16500b8c7c3813c05b2d76..3b2b17191fe8e38cfd2fed77686e87e4d0d34d0c 100644 (file)
--- a/lib/Target/Sparc/SparcInstrInfo.td
+++ b/lib/Target/Sparc/SparcInstrInfo.td
@@ -967,13 +967,13 @@ let Predicates = [HasV9] in {
 }
 
 // POPCrr - This does a ctpop of a 64-bit register.  As such, we have to clear
-// the top 32-bits before using it.  To do this clearing, we use a SLLri X,0.
+// the top 32-bits before using it.  To do this clearing, we use a SRLri X,0.
 let rs1 = 0 in
   def POPCrr : F3_1<2, 0b101110,
                     (outs IntRegs:$dst), (ins IntRegs:$src),
                     "popc $src, $dst", []>, Requires<[HasV9]>;
 def : Pat<(ctpop i32:$src),
-          (POPCrr (SLLri $src, 0))>;
+          (POPCrr (SRLri $src, 0))>;
 
 //===----------------------------------------------------------------------===//
 // Non-Instruction Patterns

diff --git a/test/CodeGen/SPARC/ctpop.ll b/test/CodeGen/SPARC/ctpop.ll
index 916a41496e2a6858db78913f499263dfe2bb28b4..eab1de6c952c0ea1343c198fb5252360c7d0b748 100644 (file)
--- a/test/CodeGen/SPARC/ctpop.ll
+++ b/test/CodeGen/SPARC/ctpop.ll
@@ -1,8 +1,22 @@
-; RUN: llc < %s -march=sparc -mattr=-v9 | not grep popc
-; RUN: llc < %s -march=sparc -mattr=+v9 | grep popc
+; RUN: llc < %s -march=sparc -mattr=-v9 | FileCheck %s -check-prefix=V8
+; RUN: llc < %s -march=sparc -mattr=+v9 | FileCheck %s -check-prefix=V9
+; RUN: llc < %s -march=sparcv9 | FileCheck %s -check-prefix=SPARC64
 
 declare i32 @llvm.ctpop.i32(i32)
 
+; V8-LABEL: test
+; V8-NOT  : popc
+
+; V9-LABEL: test
+; V9:       srl %o0, 0, %o0
+; V9-NEXT:  jmp %o7+8
+; V9-NEXT:  popc %o0, %o0
+
+; SPARC64-LABEL: test
+; SPARC64:       srl %o0, 0, %o0
+; SPARC64:       jmp %o7+8
+; SPARC64:       popc %o0, %o0
+
 define i32 @test(i32 %X) {
         %Y = call i32 @llvm.ctpop.i32( i32 %X )         ; <i32> [#uses=1]
         ret i32 %Y