| commit | 6c0ae87241fcdd95aacfd89d70216fb3fb9aba07 | |
| author | Nemanja Ivanovic <nemanja.i.ibm@gmail.com> | |
| Mon, 11 Dec 2017 14:35:48 +0000 (11 14:35 +0000) | ||
| committer | Nemanja Ivanovic <nemanja.i.ibm@gmail.com> | |
| Mon, 11 Dec 2017 14:35:48 +0000 (11 14:35 +0000) | ||
| tree | 1af8f627e653e74869d522c0df257809be372c76 | treesnapshot (tar.gz zip) |
| parent | 3386088d3ed65b1d5a446bce6eab00d6dbebffc8 | commitdiff |
[PowerPC] Sign-extend negative constant stores
Second part of https://reviews.llvm.org/D40348.
Revision r318436 has extended all constants feeding a store to 64 bits
to allow for CSE on the SDAG. However, negative constants were zero extended
which made the constant being loaded appear to be a positive value larger than
16 bits. This resulted in long sequences to materialize such constants
rather than simply a "load immediate". This patch just sign-extends those
updated constants so that they remain 16-bit signed immediates if they started
out that way.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@320368 91177308-0d34-0410-b5e6-96231b3b80d8
Second part of https://reviews.llvm.org/D40348.
Revision r318436 has extended all constants feeding a store to 64 bits
to allow for CSE on the SDAG. However, negative constants were zero extended
which made the constant being loaded appear to be a positive value larger than
16 bits. This resulted in long sequences to materialize such constants
rather than simply a "load immediate". This patch just sign-extends those
updated constants so that they remain 16-bit signed immediates if they started
out that way.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@320368 91177308-0d34-0410-b5e6-96231b3b80d8
| lib/Target/PowerPC/PPCISelLowering.cpp | diffblobblamehistory | |
| test/CodeGen/PowerPC/testComparesigeui.ll | diffblobblamehistory | |
| test/CodeGen/PowerPC/testComparesllgeui.ll | diffblobblamehistory |