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https://github.com/c64scene-ar/llvm-6502.git
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c17e0cf6c0
reduction of address calculations down to basic pointer arithmetic. This is currently off by default, as it needs a few other features before it becomes generally useful. And even when enabled, full strength reduction is only performed when it doesn't increase register pressure, and when several other conditions are true. This also factors out a bunch of exisiting LSR code out of StrengthReduceStridedIVUsers into separate functions, and tidies up IV insertion. This actually decreases register pressure even in non-superhero mode. The change in iv-users-in-other-loops.ll is an example of this; there are two more adds because there are two fewer leas, and there is less spilling. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65108 91177308-0d34-0410-b5e6-96231b3b80d8
34 lines
1.4 KiB
LLVM
34 lines
1.4 KiB
LLVM
; RUN: llvm-as < %s | llc -march=x86 -enable-full-lsr >%t
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; RUN: grep {addl \\\$4,} %t | count 3
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; RUN: not grep {,%} %t
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define void @foo(float* nocapture %A, float* nocapture %B, float* nocapture %C, i32 %N) nounwind {
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entry:
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%0 = icmp sgt i32 %N, 0 ; <i1> [#uses=1]
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br i1 %0, label %bb, label %return
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bb: ; preds = %bb, %entry
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%i.03 = phi i32 [ 0, %entry ], [ %indvar.next, %bb ] ; <i32> [#uses=5]
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%1 = getelementptr float* %A, i32 %i.03 ; <float*> [#uses=1]
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%2 = load float* %1, align 4 ; <float> [#uses=1]
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%3 = getelementptr float* %B, i32 %i.03 ; <float*> [#uses=1]
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%4 = load float* %3, align 4 ; <float> [#uses=1]
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%5 = add float %2, %4 ; <float> [#uses=1]
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%6 = getelementptr float* %C, i32 %i.03 ; <float*> [#uses=1]
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store float %5, float* %6, align 4
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%7 = add i32 %i.03, 10 ; <i32> [#uses=3]
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%8 = getelementptr float* %A, i32 %7 ; <float*> [#uses=1]
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%9 = load float* %8, align 4 ; <float> [#uses=1]
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%10 = getelementptr float* %B, i32 %7 ; <float*> [#uses=1]
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%11 = load float* %10, align 4 ; <float> [#uses=1]
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%12 = add float %9, %11 ; <float> [#uses=1]
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%13 = getelementptr float* %C, i32 %7 ; <float*> [#uses=1]
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store float %12, float* %13, align 4
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%indvar.next = add i32 %i.03, 1 ; <i32> [#uses=2]
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%exitcond = icmp eq i32 %indvar.next, %N ; <i1> [#uses=1]
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br i1 %exitcond, label %return, label %bb
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return: ; preds = %bb, %entry
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ret void
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}
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