2014-03-18 22:07:45 +00:00
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Pull in r198280 from upstream llvm trunk (by Venkatraman Govindaraju):
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[SparcV9]: Use SRL instead of SLL to clear top 32-bits in ctpop:i32. SLL does not clear top 32 bit, only SRL does.
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2014-05-24 22:27:31 +00:00
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Introduced here: http://svnweb.freebsd.org/changeset/base/262261
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2014-03-18 22:07:45 +00:00
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Index: lib/Target/Sparc/SparcInstrInfo.td
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===================================================================
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--- lib/Target/Sparc/SparcInstrInfo.td
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+++ lib/Target/Sparc/SparcInstrInfo.td
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@@ -967,13 +967,13 @@ let Predicates = [HasV9] in {
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}
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// POPCrr - This does a ctpop of a 64-bit register. As such, we have to clear
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-// the top 32-bits before using it. To do this clearing, we use a SLLri X,0.
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+// the top 32-bits before using it. To do this clearing, we use a SRLri X,0.
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let rs1 = 0 in
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def POPCrr : F3_1<2, 0b101110,
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(outs IntRegs:$dst), (ins IntRegs:$src),
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"popc $src, $dst", []>, Requires<[HasV9]>;
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def : Pat<(ctpop i32:$src),
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- (POPCrr (SLLri $src, 0))>;
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+ (POPCrr (SRLri $src, 0))>;
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//===----------------------------------------------------------------------===//
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// Non-Instruction Patterns
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Index: test/CodeGen/SPARC/ctpop.ll
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===================================================================
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--- test/CodeGen/SPARC/ctpop.ll
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+++ test/CodeGen/SPARC/ctpop.ll
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@@ -1,8 +1,22 @@
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-; RUN: llc < %s -march=sparc -mattr=-v9 | not grep popc
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-; RUN: llc < %s -march=sparc -mattr=+v9 | grep popc
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+; RUN: llc < %s -march=sparc -mattr=-v9 | FileCheck %s -check-prefix=V8
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+; RUN: llc < %s -march=sparc -mattr=+v9 | FileCheck %s -check-prefix=V9
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+; RUN: llc < %s -march=sparcv9 | FileCheck %s -check-prefix=SPARC64
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declare i32 @llvm.ctpop.i32(i32)
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+; V8-LABEL: test
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+; V8-NOT : popc
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+
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+; V9-LABEL: test
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+; V9: srl %o0, 0, %o0
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+; V9-NEXT: jmp %o7+8
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+; V9-NEXT: popc %o0, %o0
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+
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+; SPARC64-LABEL: test
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+; SPARC64: srl %o0, 0, %o0
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+; SPARC64: jmp %o7+8
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+; SPARC64: popc %o0, %o0
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+
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define i32 @test(i32 %X) {
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%Y = call i32 @llvm.ctpop.i32( i32 %X ) ; <i32> [#uses=1]
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ret i32 %Y
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