FailedChanges

Summary

  1. [PowerPC] Cust lower fpext v2f32 to v2f64 from extract_subvector v4f32 This is a follow up patch from https://reviews.llvm.org/D57857 to handle extract_subvector v4f32. For cases where we fpext of v2f32 to v2f64 from extract_subvector we currently generate on P9 the following: lxv 0, 0(3) xxsldwi 1, 0, 0, 1 xscvspdpn 2, 0 xxsldwi 3, 0, 0, 3 xxswapd 0, 0 xscvspdpn 1, 1 xscvspdpn 3, 3 xscvspdpn 0, 0 xxmrghd 0, 0, 3 xxmrghd 1, 2, 1 stxv 0, 0(4) stxv 1, 0(5) This patch custom lower it to the following sequence: lxv 0, 0(3) # load the v4f32 <w0, w1, w2, w3> xxmrghw 2, 0, 0 # Produce the following vector <w0, w0, w1, w1> xxmrglw 3, 0, 0 # Produce the following vector <w2, w2, w3, w3> xvcvspdp 2, 2 # FP-extend to <d0, d1> xvcvspdp 3, 3 # FP-extend to <d2, d3> stxv 2, 0(5) # Store <d0, d1> (%vecinit11) stxv 3, 0(4) # Store <d2, d3> (%vecinit4) Differential Revision: https://reviews.llvm.org/D61961
Revision 372029 by lei:
[PowerPC] Cust lower fpext v2f32 to v2f64 from extract_subvector v4f32

This is a follow up patch from https://reviews.llvm.org/D57857 to handle
extract_subvector v4f32.  For cases where we fpext of v2f32 to v2f64 from
extract_subvector we currently generate on P9 the following:

  lxv 0, 0(3)
  xxsldwi 1, 0, 0, 1
  xscvspdpn 2, 0
  xxsldwi 3, 0, 0, 3
  xxswapd 0, 0
  xscvspdpn 1, 1
  xscvspdpn 3, 3
  xscvspdpn 0, 0
  xxmrghd 0, 0, 3
  xxmrghd 1, 2, 1
  stxv 0, 0(4)
  stxv 1, 0(5)

This patch custom lower it to the following sequence:

  lxv 0, 0(3)       # load the v4f32 <w0, w1, w2, w3>
  xxmrghw 2, 0, 0   # Produce the following vector <w0, w0, w1, w1>
  xxmrglw 3, 0, 0   # Produce the following vector <w2, w2, w3, w3>
  xvcvspdp 2, 2     # FP-extend to <d0, d1>
  xvcvspdp 3, 3     # FP-extend to <d2, d3>
  stxv 2, 0(5)      # Store <d0, d1> (%vecinit11)
  stxv 3, 0(4)      # Store <d2, d3> (%vecinit4)

Differential Revision: https://reviews.llvm.org/D61961
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The file was added/llvm/trunk/test/CodeGen/PowerPC/reduce_scalarization02.llllvm.src/test/CodeGen/PowerPC/reduce_scalarization02.ll