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6 Commits

Author SHA1 Message Date
Albion Fung e29bb074c6 [PowerPC] Exploit xxsplti32dx (constant materialization) for scalars 
This patch exploits the xxsplti32dx instruction available on Power10
in place of constant pool loads where xxspltidp would not be able to,
usually because the immediate cannot fit into 32 bits.

Differential Revision: https://reviews.llvm.org/D95458
 2021-03-24 15:59:59 -04:00
Fangrui Song d33abc337c Migrate MCContext::createTempSymbol call sites to AlwaysAddSuffix=true 
Most call sites set AlwaysAddSuffix to true. The two use cases do not really
need false and can be more consistent with other temporary symbol usage.
 2020-12-21 14:04:13 -08:00
Stefan Pintilie a60251d739 [PowerPC] Add linker opt for PC Relative GOT indirect accesses 
A linker optimization is available on PowerPC for GOT indirect PCRelative loads.

The idea is that we can mark a usual GOT indirect load:

pld 3, vec@got@pcrel(0), 1
lwa 3, 4(3)

With a relocation to say that if we don't need to go through the GOT we can let
the linker further optimize this and replace a load with a nop.

  pld 3, vec@got@pcrel(0), 1
.Lpcrel1:
.reloc .Lpcrel1-8,R_PPC64_PCREL_OPT,.-(.Lpcrel1-8)
  lwa 3, 4(3)

This patch adds the logic that allows the compiler to add the R_PPC64_PCREL_OPT.

Reviewers: nemanjai, lei, hfinkel, sfertile, efriedma, tstellar, grosbach

Reviewed By: nemanjai

Differential Revision: https://reviews.llvm.org/D79864
 2020-07-22 09:08:23 -05:00
Stefan Pintilie 0d3a5d09e3 [NFC][PowerPC] Updated a number of Power PC tests used for PC Relative 
Updated the tests to use -mcpu=pwr10 instead of -mcpu=future.
Updated the tests to include Big Endian testing.
 2020-07-21 12:28:56 -05:00
Stefan Pintilie 05e21f8cea [PowerPC][NFC] Add more PC Relative tests 
Modify the pcrel.ll test file to add more testing for PC Relative.
 2020-06-05 05:55:03 -05:00
Stefan Pintilie 75828ef615 [PowerPC][Future] Initial support for PCRel addressing for constant pool loads 
Add initial support for PC Relative addressing for constant pool loads.
This includes adding a new relocation for @pcrel and adding a new PowerPC flag
to identify PC relative addressing.

Differential Revision: https://reviews.llvm.org/D74486
 2020-04-09 11:17:23 -05:00