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https://github.com/c64scene-ar/llvm-6502.git
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827307b95f
When unsafe FP math operations are enabled, we can use the fre[s] and frsqrte[s] instructions, which generate reciprocal (sqrt) estimates, together with some Newton iteration, in order to quickly generate floating-point division and sqrt results. All of these instructions are separately optional, and so each has its own feature flag (except for the Altivec instructions, which are covered under the existing Altivec flag). Doing this is not only faster than using the IEEE-compliant fdiv/fsqrt instructions, but allows these computations to be pipelined with other computations in order to hide their overall latency. I've also added a couple of missing fnmsub patterns which turned out to be missing (but are necessary for good code generation of the Newton iterations). Altivec needs a similar fix, but that will probably be more complicated because fneg is expanded for Altivec's v4f32. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178617 91177308-0d34-0410-b5e6-96231b3b80d8
179 lines
3.2 KiB
LLVM
179 lines
3.2 KiB
LLVM
; RUN: llc < %s -mtriple=powerpc64-unknown-linux-gnu -mcpu=pwr7 -enable-unsafe-fp-math | FileCheck %s
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; RUN: llc < %s -mtriple=powerpc64-unknown-linux-gnu -mcpu=pwr7 | FileCheck -check-prefix=CHECK-SAFE %s
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target datalayout = "E-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-f128:128:128-v128:128:128-n32:64"
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target triple = "powerpc64-unknown-linux-gnu"
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declare double @llvm.sqrt.f64(double)
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declare float @llvm.sqrt.f32(float)
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declare <4 x float> @llvm.sqrt.v4f32(<4 x float>)
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define double @foo(double %a, double %b) nounwind {
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entry:
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%x = call double @llvm.sqrt.f64(double %b)
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%r = fdiv double %a, %x
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ret double %r
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; CHECK: @foo
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; CHECK: frsqrte
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; CHECK: fnmsub
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; CHECK: fmul
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; CHECK: fmadd
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; CHECK: fmul
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; CHECK: fmul
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; CHECK: fmadd
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; CHECK: fmul
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; CHECK: fmul
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; CHECK: blr
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; CHECK-SAFE: @foo
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; CHECK-SAFE: fsqrt
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; CHECK-SAFE: fdiv
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; CHECK-SAFE: blr
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}
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define float @goo(float %a, float %b) nounwind {
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entry:
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%x = call float @llvm.sqrt.f32(float %b)
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%r = fdiv float %a, %x
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ret float %r
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; CHECK: @goo
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; CHECK: frsqrtes
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; CHECK: fnmsubs
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; CHECK: fmuls
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; CHECK: fmadds
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; CHECK: fmuls
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; CHECK: fmuls
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; CHECK: blr
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; CHECK-SAFE: @goo
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; CHECK-SAFE: fsqrts
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; CHECK-SAFE: fdivs
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; CHECK-SAFE: blr
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}
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define <4 x float> @hoo(<4 x float> %a, <4 x float> %b) nounwind {
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entry:
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%x = call <4 x float> @llvm.sqrt.v4f32(<4 x float> %b)
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%r = fdiv <4 x float> %a, %x
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ret <4 x float> %r
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; CHECK: @hoo
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; CHECK: vrsqrtefp
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; CHECK-SAFE: @hoo
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; CHECK-SAFE-NOT: vrsqrtefp
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; CHECK-SAFE: blr
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}
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define double @foo2(double %a, double %b) nounwind {
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entry:
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%r = fdiv double %a, %b
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ret double %r
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; CHECK: @foo2
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; CHECK: fre
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; CHECK: fnmsub
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; CHECK: fmadd
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; CHECK: fnmsub
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; CHECK: fmadd
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; CHECK: fmul
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; CHECK: blr
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; CHECK-SAFE: @foo2
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; CHECK-SAFE: fdiv
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; CHECK-SAFE: blr
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}
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define float @goo2(float %a, float %b) nounwind {
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entry:
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%r = fdiv float %a, %b
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ret float %r
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; CHECK: @goo2
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; CHECK: fres
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; CHECK: fnmsubs
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; CHECK: fmadds
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; CHECK: fmuls
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; CHECK: blr
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; CHECK-SAFE: @goo2
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; CHECK-SAFE: fdivs
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; CHECK-SAFE: blr
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}
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define <4 x float> @hoo2(<4 x float> %a, <4 x float> %b) nounwind {
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entry:
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%r = fdiv <4 x float> %a, %b
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ret <4 x float> %r
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; CHECK: @hoo2
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; CHECK: vrefp
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; CHECK-SAFE: @hoo2
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; CHECK-SAFE-NOT: vrefp
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; CHECK-SAFE: blr
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}
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define double @foo3(double %a) nounwind {
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entry:
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%r = call double @llvm.sqrt.f64(double %a)
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ret double %r
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; CHECK: @foo3
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; CHECK: frsqrte
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; CHECK: fnmsub
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; CHECK: fmul
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; CHECK: fmadd
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; CHECK: fmul
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; CHECK: fmul
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; CHECK: fmadd
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; CHECK: fmul
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; CHECK: fre
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; CHECK: fnmsub
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; CHECK: fmadd
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; CHECK: fnmsub
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; CHECK: fmadd
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; CHECK: blr
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; CHECK-SAFE: @foo3
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; CHECK-SAFE: fsqrt
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; CHECK-SAFE: blr
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}
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define float @goo3(float %a) nounwind {
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entry:
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%r = call float @llvm.sqrt.f32(float %a)
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ret float %r
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; CHECK: @goo3
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; CHECK: frsqrtes
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; CHECK: fnmsubs
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; CHECK: fmuls
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; CHECK: fmadds
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; CHECK: fmuls
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; CHECK: fres
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; CHECK: fnmsubs
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; CHECK: fmadds
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; CHECK: blr
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; CHECK-SAFE: @goo3
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; CHECK-SAFE: fsqrts
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; CHECK-SAFE: blr
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}
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define <4 x float> @hoo3(<4 x float> %a) nounwind {
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entry:
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%r = call <4 x float> @llvm.sqrt.v4f32(<4 x float> %a)
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ret <4 x float> %r
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; CHECK: @hoo3
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; CHECK: vrsqrtefp
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; CHECK: vrefp
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; CHECK-SAFE: @hoo3
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; CHECK-SAFE-NOT: vrsqrtefp
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; CHECK-SAFE: blr
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}
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