mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-28 19:31:58 +00:00
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
|
|
target datalayout = "E-m:e-i64:64-n32:64"
|
|
target triple = "powerpc64-unknown-linux-gnu"
|
|
|
|
; Function Attrs: nounwind
|
|
define double @foo() #1 {
|
|
entry:
|
|
%x = alloca [2048 x float], align 4
|
|
%y = alloca [2048 x float], align 4
|
|
%0 = bitcast [2048 x float]* %x to i8*
|
|
call void @llvm.lifetime.start(i64 8192, i8* %0) #2
|
|
%1 = bitcast [2048 x float]* %y to i8*
|
|
call void @llvm.lifetime.start(i64 8192, i8* %1) #2
|
|
br label %for.body.i
|
|
|
|
; CHECK-LABEL: @foo
|
|
; CHECK: addi [[REG1:[0-9]+]], 1,
|
|
; CHECK: addi [[REG2:[0-9]+]], 1,
|
|
; CHECK: %for.body.i
|
|
; CHECK-DAG: lfsx {{[0-9]+}}, [[REG1]],
|
|
; CHECK-DAG: lfsx {{[0-9]+}}, [[REG2]],
|
|
; CHECK: blr
|
|
|
|
for.body.i: ; preds = %for.body.i.preheader, %for.body.i
|
|
%accumulator.09.i = phi double [ %add.i, %for.body.i ], [ 0.000000e+00, %entry ]
|
|
%i.08.i = phi i64 [ %inc.i, %for.body.i ], [ 0, %entry ]
|
|
%arrayidx.i = getelementptr inbounds [2048 x float]* %x, i64 0, i64 %i.08.i
|
|
%v14 = load float* %arrayidx.i, align 4
|
|
%conv.i = fpext float %v14 to double
|
|
%arrayidx1.i = getelementptr inbounds [2048 x float]* %y, i64 0, i64 %i.08.i
|
|
%v15 = load float* %arrayidx1.i, align 4
|
|
%conv2.i = fpext float %v15 to double
|
|
%mul.i = fmul double %conv.i, %conv2.i
|
|
%add.i = fadd double %accumulator.09.i, %mul.i
|
|
%inc.i = add nuw nsw i64 %i.08.i, 1
|
|
%exitcond.i = icmp eq i64 %i.08.i, 2047
|
|
br i1 %exitcond.i, label %loop.exit, label %for.body.i
|
|
|
|
loop.exit: ; preds = %for.body.i
|
|
ret double %accumulator.09.i
|
|
}
|
|
|
|
; Function Attrs: nounwind
|
|
declare void @llvm.lifetime.start(i64, i8* nocapture) #2
|
|
|
|
declare void @bar(float*, float*)
|
|
|
|
; Function Attrs: nounwind
|
|
declare void @llvm.lifetime.end(i64, i8* nocapture) #2
|
|
|
|
attributes #0 = { nounwind readonly }
|
|
attributes #1 = { nounwind }
|
|
attributes #2 = { nounwind }
|
|
|
|
|