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https://github.com/c64scene-ar/llvm-6502.git
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d822892455
This shaves off 4 popcounts from the hacked 186.crafty source. This is enabled even when a native popcount instruction is available. The combined code is one operation longer but it should be faster nevertheless. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123621 91177308-0d34-0410-b5e6-96231b3b80d8
32 lines
700 B
LLVM
32 lines
700 B
LLVM
; RUN: llc -march=x86-64 < %s | FileCheck %s
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declare i64 @llvm.ctpop.i64(i64) nounwind readnone
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define i32 @test1(i64 %x) nounwind readnone {
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%count = tail call i64 @llvm.ctpop.i64(i64 %x)
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%cast = trunc i64 %count to i32
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%cmp = icmp ugt i32 %cast, 1
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%conv = zext i1 %cmp to i32
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ret i32 %conv
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; CHECK: test1:
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; CHECK: leaq -1(%rdi)
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; CHECK-NEXT: testq
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; CHECK-NEXT: setne
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; CHECK: ret
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}
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define i32 @test2(i64 %x) nounwind readnone {
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%count = tail call i64 @llvm.ctpop.i64(i64 %x)
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%cast = trunc i64 %count to i32
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%cmp = icmp ult i32 %cast, 2
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%conv = zext i1 %cmp to i32
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ret i32 %conv
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; CHECK: test2:
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; CHECK: leaq -1(%rdi)
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; CHECK-NEXT: testq
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; CHECK-NEXT: sete
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; CHECK: ret
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}
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