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Implement multiple with overflow by 2 with an add instruction.
llvm-svn: 63090
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@ -3612,6 +3612,17 @@ def : Pat<(parallel (X86smul_ovf (load addr:$src1), i32immSExt8:$src2),
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(implicit EFLAGS)),
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(IMUL32rmi8 addr:$src1, i32immSExt8:$src2)>;
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// Optimize multiple with overflow by 2.
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let AddedComplexity = 2 in {
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def : Pat<(parallel (X86smul_ovf GR16:$src1, 2),
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(implicit EFLAGS)),
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(ADD16rr GR16:$src1, GR16:$src1)>;
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def : Pat<(parallel (X86smul_ovf GR32:$src1, 2),
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(implicit EFLAGS)),
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(ADD32rr GR32:$src1, GR32:$src1)>;
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}
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//===----------------------------------------------------------------------===//
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// Floating Point Stack Support
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//===----------------------------------------------------------------------===//
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test/CodeGen/X86/smul-with-overflow-2.ll
Normal file
20
test/CodeGen/X86/smul-with-overflow-2.ll
Normal file
@ -0,0 +1,20 @@
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; RUN: llvm-as < %s | llc -march=x86 | grep mul | count 1
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; RUN: llvm-as < %s | llc -march=x86 | grep add | count 3
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define i32 @t1(i32 %a, i32 %b) nounwind readnone {
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entry:
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%tmp0 = add i32 %b, %a
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%tmp1 = call { i32, i1 } @llvm.smul.with.overflow.i32(i32 %tmp0, i32 2)
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%tmp2 = extractvalue { i32, i1 } %tmp1, 0
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ret i32 %tmp2
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}
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define i32 @t2(i32 %a, i32 %b) nounwind readnone {
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entry:
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%tmp0 = add i32 %b, %a
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%tmp1 = call { i32, i1 } @llvm.smul.with.overflow.i32(i32 %tmp0, i32 4)
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%tmp2 = extractvalue { i32, i1 } %tmp1, 0
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ret i32 %tmp2
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}
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declare { i32, i1 } @llvm.smul.with.overflow.i32(i32, i32) nounwind
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