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https://github.com/c64scene-ar/llvm-6502.git
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b7c01bf403
MachineLICM uses a callback named hasLowDefLatency to determine if an instruction def operand has a 'low' latency. If all relevant operands have a 'low' latency, the instruction is considered too cheap to hoist out of loops even in low-register-pressure situations. On PowerPC cores, both the embedded cores and the others, there is no reason to believe that this is a good choice: all instructions have a cost inside a loop, and hoisting them when not limited by register pressure is a reasonable default. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225471 91177308-0d34-0410-b5e6-96231b3b80d8
56 lines
1.8 KiB
LLVM
56 lines
1.8 KiB
LLVM
; RUN: llc -mcpu=pwr7 < %s | FileCheck %s
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target datalayout = "E-m:e-i64:64-n32:64"
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target triple = "powerpc64-unknown-linux-gnu"
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; Function Attrs: nounwind
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define double @foo() #1 {
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entry:
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%x = alloca [2048 x float], align 4
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%y = alloca [2048 x float], align 4
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%0 = bitcast [2048 x float]* %x to i8*
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call void @llvm.lifetime.start(i64 8192, i8* %0) #2
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%1 = bitcast [2048 x float]* %y to i8*
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call void @llvm.lifetime.start(i64 8192, i8* %1) #2
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br label %for.body.i
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; CHECK-LABEL: @foo
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; CHECK: addi [[REG1:[0-9]+]], 1,
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; CHECK: addi [[REG2:[0-9]+]], 1,
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; CHECK: %for.body.i
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; CHECK-DAG: lfsx {{[0-9]+}}, [[REG1]],
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; CHECK-DAG: lfsx {{[0-9]+}}, [[REG2]],
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; CHECK: blr
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for.body.i: ; preds = %for.body.i.preheader, %for.body.i
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%accumulator.09.i = phi double [ %add.i, %for.body.i ], [ 0.000000e+00, %entry ]
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%i.08.i = phi i64 [ %inc.i, %for.body.i ], [ 0, %entry ]
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%arrayidx.i = getelementptr inbounds [2048 x float]* %x, i64 0, i64 %i.08.i
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%v14 = load float* %arrayidx.i, align 4
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%conv.i = fpext float %v14 to double
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%arrayidx1.i = getelementptr inbounds [2048 x float]* %y, i64 0, i64 %i.08.i
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%v15 = load float* %arrayidx1.i, align 4
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%conv2.i = fpext float %v15 to double
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%mul.i = fmul double %conv.i, %conv2.i
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%add.i = fadd double %accumulator.09.i, %mul.i
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%inc.i = add nuw nsw i64 %i.08.i, 1
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%exitcond.i = icmp eq i64 %i.08.i, 2047
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br i1 %exitcond.i, label %loop.exit, label %for.body.i
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loop.exit: ; preds = %for.body.i
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ret double %accumulator.09.i
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}
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; Function Attrs: nounwind
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declare void @llvm.lifetime.start(i64, i8* nocapture) #2
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declare void @bar(float*, float*)
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; Function Attrs: nounwind
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declare void @llvm.lifetime.end(i64, i8* nocapture) #2
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attributes #0 = { nounwind readonly }
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attributes #1 = { nounwind }
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attributes #2 = { nounwind }
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