paweld/fpc
1
0
Fork 0
mirror of https://gitlab.com/freepascal.org/fpc/source.git synced 2025-04-19 23:19:24 +02:00
Code Issues Packages Projects Releases Wiki Activity

* x86-64: we can spill replace 32 bit operations if the operation does not modify a register

Browse Source 
git-svn-id: trunk@49097 -
This commit is contained in:
florian 2021-03-31 21:23:22 +00:00
parent 8ea95e9b95
commit 7811b915a9
1 changed files with 4 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
compiler/x86/rgx86.pas
View File

@ -407,8 +407,10 @@ implementation
{ 32 bit operations on 32 bit registers on x86_64 can result in
zeroing the upper 32 bits of the register. This does not happen
with memory operations, so we have to perform these calculations
in registers. }
if (opsize=S_L) then
in registers.
However, for instructions not modifying registers, this is not a problem }
if (opsize=S_L) and (opcode<>A_CMP) and (opcode<>A_TEST) and (opcode<>A_BT) then
replaceoper:=-1;
{$endif x86_64}