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https://github.com/c64scene-ar/llvm-6502.git
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3a106a2813
For best-case performance on Cortex-A57, we should try to use a balanced mix of odd and even D-registers when performing a critical sequence of independent, non-quadword FP/ASIMD floating-point multiply or multiply-accumulate operations.
This pass attempts to detect situations where the register allocation may adversely affect this load balancing and to change the registers used so as to better utilize the CPU.
Ideally we'd just take each multiply or multiply-accumulate in turn and allocate it alternating even or odd registers. However, multiply-accumulates are most efficiently performed in the same functional unit as their accumulation operand. Therefore this pass tries to find maximal sequences ("Chains") of multiply-accumulates linked via their accumulation operand, and assign them all the same "color" (oddness/evenness).
This optimization affects S-register and D-register floating point multiplies and FMADD/FMAs, as well as vector (floating point only) muls and FMADD/FMA. Q register instructions (and 128-bit vector instructions) are not affected.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215199 91177308-0d34-0410-b5e6-96231b3b80d8
324 lines
12 KiB
LLVM
324 lines
12 KiB
LLVM
; RUN: llc < %s -mcpu=cortex-a57 -aarch64-a57-fp-load-balancing-override=1 -aarch64-a57-fp-load-balancing-force-all | FileCheck %s --check-prefix CHECK --check-prefix CHECK-EVEN
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; RUN: llc < %s -mcpu=cortex-a57 -aarch64-a57-fp-load-balancing-override=2 -aarch64-a57-fp-load-balancing-force-all | FileCheck %s --check-prefix CHECK --check-prefix CHECK-ODD
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; Test the AArch64A57FPLoadBalancing pass. This pass relies heavily on register allocation, so
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; our test strategy is to:
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; * Force the pass to always perform register swapping even if the dest register is of the
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; correct color already (-force-all)
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; * Force the pass to ignore all hints it obtained from regalloc (-deterministic-balance),
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; and run it twice, once where it always hints odd, and once where it always hints even.
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;
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; We then use regex magic to check that in the two cases the register allocation is
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; different; this is what gives us the testing coverage and distinguishes cases where
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; the pass has done some work versus accidental regalloc.
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target datalayout = "e-m:e-i64:64-i128:128-n32:64-S128"
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target triple = "aarch64"
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; Non-overlapping groups - shouldn't need any changing at all.
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; CHECK-LABEL: f1:
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; CHECK-EVEN: fmadd [[x:d[0-9]*[02468]]]
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; CHECK-ODD: fmadd [[x:d[0-9]*[13579]]]
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; CHECK: fmadd [[x]]
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; CHECK: fmsub [[x]]
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; CHECK: fmadd [[x]]
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; CHECK: str [[x]]
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define void @f1(double* nocapture readonly %p, double* nocapture %q) #0 {
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entry:
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%0 = load double* %p, align 8
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%arrayidx1 = getelementptr inbounds double* %p, i64 1
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%1 = load double* %arrayidx1, align 8
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%arrayidx2 = getelementptr inbounds double* %p, i64 2
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%2 = load double* %arrayidx2, align 8
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%arrayidx3 = getelementptr inbounds double* %p, i64 3
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%3 = load double* %arrayidx3, align 8
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%arrayidx4 = getelementptr inbounds double* %p, i64 4
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%4 = load double* %arrayidx4, align 8
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%mul = fmul fast double %0, %1
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%add = fadd fast double %mul, %4
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%mul5 = fmul fast double %1, %2
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%add6 = fadd fast double %mul5, %add
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%mul7 = fmul fast double %1, %3
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%sub = fsub fast double %add6, %mul7
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%mul8 = fmul fast double %2, %3
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%add9 = fadd fast double %mul8, %sub
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store double %add9, double* %q, align 8
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%arrayidx11 = getelementptr inbounds double* %p, i64 5
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%5 = load double* %arrayidx11, align 8
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%arrayidx12 = getelementptr inbounds double* %p, i64 6
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%6 = load double* %arrayidx12, align 8
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%arrayidx13 = getelementptr inbounds double* %p, i64 7
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%7 = load double* %arrayidx13, align 8
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%mul15 = fmul fast double %6, %7
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%mul16 = fmul fast double %0, %5
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%add17 = fadd fast double %mul16, %mul15
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%mul18 = fmul fast double %5, %6
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%add19 = fadd fast double %mul18, %add17
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%arrayidx20 = getelementptr inbounds double* %q, i64 1
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store double %add19, double* %arrayidx20, align 8
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ret void
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}
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; Overlapping groups - coloring needed.
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; CHECK-LABEL: f2:
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; CHECK-EVEN: fmadd [[x:d[0-9]*[02468]]]
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; CHECK-EVEN: fmul [[y:d[0-9]*[13579]]]
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; CHECK-ODD: fmadd [[x:d[0-9]*[13579]]]
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; CHECK-ODD: fmul [[y:d[0-9]*[02468]]]
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; CHECK: fmadd [[x]]
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; CHECK: fmadd [[y]]
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; CHECK: fmsub [[x]]
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; CHECK: fmadd [[y]]
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; CHECK: fmadd [[x]]
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; CHECK: stp [[x]], [[y]]
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define void @f2(double* nocapture readonly %p, double* nocapture %q) #0 {
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entry:
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%0 = load double* %p, align 8
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%arrayidx1 = getelementptr inbounds double* %p, i64 1
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%1 = load double* %arrayidx1, align 8
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%arrayidx2 = getelementptr inbounds double* %p, i64 2
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%2 = load double* %arrayidx2, align 8
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%arrayidx3 = getelementptr inbounds double* %p, i64 3
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%3 = load double* %arrayidx3, align 8
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%arrayidx4 = getelementptr inbounds double* %p, i64 4
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%4 = load double* %arrayidx4, align 8
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%arrayidx5 = getelementptr inbounds double* %p, i64 5
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%5 = load double* %arrayidx5, align 8
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%arrayidx6 = getelementptr inbounds double* %p, i64 6
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%6 = load double* %arrayidx6, align 8
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%arrayidx7 = getelementptr inbounds double* %p, i64 7
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%7 = load double* %arrayidx7, align 8
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%mul = fmul fast double %0, %1
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%add = fadd fast double %mul, %7
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%mul8 = fmul fast double %5, %6
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%mul9 = fmul fast double %1, %2
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%add10 = fadd fast double %mul9, %add
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%mul11 = fmul fast double %3, %4
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%add12 = fadd fast double %mul11, %mul8
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%mul13 = fmul fast double %1, %3
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%sub = fsub fast double %add10, %mul13
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%mul14 = fmul fast double %4, %5
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%add15 = fadd fast double %mul14, %add12
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%mul16 = fmul fast double %2, %3
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%add17 = fadd fast double %mul16, %sub
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store double %add17, double* %q, align 8
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%arrayidx19 = getelementptr inbounds double* %q, i64 1
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store double %add15, double* %arrayidx19, align 8
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ret void
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}
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; Dest register is live on block exit - fixup needed.
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; CHECK-LABEL: f3:
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; CHECK-EVEN: fmadd [[x:d[0-9]*[02468]]]
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; CHECK-ODD: fmadd [[x:d[0-9]*[13579]]]
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; CHECK: fmadd [[x]]
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; CHECK: fmsub [[x]]
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; CHECK: fmadd [[y:d[0-9]+]], {{.*}}, [[x]]
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; CHECK: str [[y]]
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define void @f3(double* nocapture readonly %p, double* nocapture %q) #0 {
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entry:
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%0 = load double* %p, align 8
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%arrayidx1 = getelementptr inbounds double* %p, i64 1
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%1 = load double* %arrayidx1, align 8
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%arrayidx2 = getelementptr inbounds double* %p, i64 2
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%2 = load double* %arrayidx2, align 8
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%arrayidx3 = getelementptr inbounds double* %p, i64 3
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%3 = load double* %arrayidx3, align 8
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%arrayidx4 = getelementptr inbounds double* %p, i64 4
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%4 = load double* %arrayidx4, align 8
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%mul = fmul fast double %0, %1
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%add = fadd fast double %mul, %4
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%mul5 = fmul fast double %1, %2
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%add6 = fadd fast double %mul5, %add
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%mul7 = fmul fast double %1, %3
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%sub = fsub fast double %add6, %mul7
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%mul8 = fmul fast double %2, %3
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%add9 = fadd fast double %mul8, %sub
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%cmp = fcmp oeq double %3, 0.000000e+00
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br i1 %cmp, label %if.then, label %if.end
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if.then: ; preds = %entry
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tail call void bitcast (void (...)* @g to void ()*)() #2
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br label %if.end
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if.end: ; preds = %if.then, %entry
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store double %add9, double* %q, align 8
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ret void
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}
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declare void @g(...) #1
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; Single precision version of f2.
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; CHECK-LABEL: f4:
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; CHECK-EVEN: fmadd [[x:s[0-9]*[02468]]]
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; CHECK-EVEN: fmul [[y:s[0-9]*[13579]]]
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; CHECK-ODD: fmadd [[x:s[0-9]*[13579]]]
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; CHECK-ODD: fmul [[y:s[0-9]*[02468]]]
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; CHECK: fmadd [[x]]
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; CHECK: fmadd [[y]]
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; CHECK: fmsub [[x]]
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; CHECK: fmadd [[y]]
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; CHECK: fmadd [[x]]
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; CHECK: stp [[x]], [[y]]
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define void @f4(float* nocapture readonly %p, float* nocapture %q) #0 {
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entry:
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%0 = load float* %p, align 4
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%arrayidx1 = getelementptr inbounds float* %p, i64 1
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%1 = load float* %arrayidx1, align 4
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%arrayidx2 = getelementptr inbounds float* %p, i64 2
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%2 = load float* %arrayidx2, align 4
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%arrayidx3 = getelementptr inbounds float* %p, i64 3
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%3 = load float* %arrayidx3, align 4
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%arrayidx4 = getelementptr inbounds float* %p, i64 4
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%4 = load float* %arrayidx4, align 4
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%arrayidx5 = getelementptr inbounds float* %p, i64 5
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%5 = load float* %arrayidx5, align 4
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%arrayidx6 = getelementptr inbounds float* %p, i64 6
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%6 = load float* %arrayidx6, align 4
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%arrayidx7 = getelementptr inbounds float* %p, i64 7
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%7 = load float* %arrayidx7, align 4
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%mul = fmul fast float %0, %1
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%add = fadd fast float %mul, %7
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%mul8 = fmul fast float %5, %6
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%mul9 = fmul fast float %1, %2
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%add10 = fadd fast float %mul9, %add
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%mul11 = fmul fast float %3, %4
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%add12 = fadd fast float %mul11, %mul8
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%mul13 = fmul fast float %1, %3
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%sub = fsub fast float %add10, %mul13
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%mul14 = fmul fast float %4, %5
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%add15 = fadd fast float %mul14, %add12
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%mul16 = fmul fast float %2, %3
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%add17 = fadd fast float %mul16, %sub
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store float %add17, float* %q, align 4
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%arrayidx19 = getelementptr inbounds float* %q, i64 1
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store float %add15, float* %arrayidx19, align 4
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ret void
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}
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; Single precision version of f3
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; CHECK-LABEL: f5:
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; CHECK-EVEN: fmadd [[x:s[0-9]*[02468]]]
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; CHECK-ODD: fmadd [[x:s[0-9]*[13579]]]
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; CHECK: fmadd [[x]]
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; CHECK: fmsub [[x]]
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; CHECK: fmadd [[y:s[0-9]+]], {{.*}}, [[x]]
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; CHECK: str [[y]]
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define void @f5(float* nocapture readonly %p, float* nocapture %q) #0 {
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entry:
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%0 = load float* %p, align 4
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%arrayidx1 = getelementptr inbounds float* %p, i64 1
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%1 = load float* %arrayidx1, align 4
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%arrayidx2 = getelementptr inbounds float* %p, i64 2
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%2 = load float* %arrayidx2, align 4
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%arrayidx3 = getelementptr inbounds float* %p, i64 3
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%3 = load float* %arrayidx3, align 4
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%arrayidx4 = getelementptr inbounds float* %p, i64 4
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%4 = load float* %arrayidx4, align 4
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%mul = fmul fast float %0, %1
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%add = fadd fast float %mul, %4
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%mul5 = fmul fast float %1, %2
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%add6 = fadd fast float %mul5, %add
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%mul7 = fmul fast float %1, %3
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%sub = fsub fast float %add6, %mul7
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%mul8 = fmul fast float %2, %3
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%add9 = fadd fast float %mul8, %sub
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%cmp = fcmp oeq float %3, 0.000000e+00
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br i1 %cmp, label %if.then, label %if.end
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if.then: ; preds = %entry
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tail call void bitcast (void (...)* @g to void ()*)() #2
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br label %if.end
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if.end: ; preds = %if.then, %entry
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store float %add9, float* %q, align 4
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ret void
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}
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; Test that regmask clobbering stops a chain sequence.
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; CHECK-LABEL: f6:
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; CHECK-EVEN: fmadd [[x:d[0-9]*[02468]]]
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; CHECK-ODD: fmadd [[x:d[0-9]*[13579]]]
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; CHECK: fmadd [[x]]
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; CHECK: fmsub [[x]]
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; CHECK: fmadd d0, {{.*}}, [[x]]
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; CHECK: bl hh
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; CHECK: str d0
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define void @f6(double* nocapture readonly %p, double* nocapture %q) #0 {
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entry:
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%0 = load double* %p, align 8
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%arrayidx1 = getelementptr inbounds double* %p, i64 1
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%1 = load double* %arrayidx1, align 8
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%arrayidx2 = getelementptr inbounds double* %p, i64 2
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%2 = load double* %arrayidx2, align 8
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%arrayidx3 = getelementptr inbounds double* %p, i64 3
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%3 = load double* %arrayidx3, align 8
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%arrayidx4 = getelementptr inbounds double* %p, i64 4
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%4 = load double* %arrayidx4, align 8
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%mul = fmul fast double %0, %1
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%add = fadd fast double %mul, %4
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%mul5 = fmul fast double %1, %2
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%add6 = fadd fast double %mul5, %add
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%mul7 = fmul fast double %1, %3
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%sub = fsub fast double %add6, %mul7
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%mul8 = fmul fast double %2, %3
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%add9 = fadd fast double %mul8, %sub
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%call = tail call double @hh(double %add9) #2
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store double %call, double* %q, align 8
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ret void
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}
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declare double @hh(double) #1
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; Check that we correctly deal with repeated operands.
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; The following testcase creates:
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; %D1<def> = FADDDrr %D0<kill>, %D0
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; We'll get a crash if we naively look at the first operand, remove it
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; from the substitution list then look at the second operand.
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; CHECK: fmadd [[x:d[0-9]+]]
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; CHECK: fadd d1, [[x]], [[x]]
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define void @f7(double* nocapture readonly %p, double* nocapture %q) #0 {
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entry:
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%0 = load double* %p, align 8
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%arrayidx1 = getelementptr inbounds double* %p, i64 1
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%1 = load double* %arrayidx1, align 8
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%arrayidx2 = getelementptr inbounds double* %p, i64 2
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%2 = load double* %arrayidx2, align 8
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%arrayidx3 = getelementptr inbounds double* %p, i64 3
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%3 = load double* %arrayidx3, align 8
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%arrayidx4 = getelementptr inbounds double* %p, i64 4
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%4 = load double* %arrayidx4, align 8
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%mul = fmul fast double %0, %1
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%add = fadd fast double %mul, %4
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%mul5 = fmul fast double %1, %2
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%add6 = fadd fast double %mul5, %add
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%mul7 = fmul fast double %1, %3
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%sub = fsub fast double %add6, %mul7
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%mul8 = fmul fast double %2, %3
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%add9 = fadd fast double %mul8, %sub
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%add10 = fadd fast double %add9, %add9
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call void @hhh(double 0.0, double %add10)
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ret void
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}
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declare void @hhh(double, double)
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attributes #0 = { nounwind "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="true" "no-nans-fp-math"="true" "stack-protector-buffer-size"="8" "unsafe-fp-math"="true" "use-soft-float"="false" }
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attributes #1 = { "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="true" "no-nans-fp-math"="true" "stack-protector-buffer-size"="8" "unsafe-fp-math"="true" "use-soft-float"="false" }
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attributes #2 = { nounwind }
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