RPCS3/llvm-mirror
1
0
Fork 0
mirror of https://github.com/RPCS3/llvm-mirror.git synced 2025-02-04 19:26:30 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

add a note

Browse Source 
llvm-svn: 45377
This commit is contained in:
Chris Lattner 2007-12-28 04:42:05 +00:00
parent f12327cd32
commit e53df84267
1 changed files with 19 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
lib/Target/README.txt
View File

@ -463,4 +463,23 @@ entry:
ret int %tmp3
}
//===---------------------------------------------------------------------===//
"basicaa" should know how to look through "or" instructions that act like add
instructions. For example in this code, the x*4+1 is turned into x*4 | 1, and
basicaa can't analyze the array subscript, leading to duplicated loads in the
generated code:
void test(int X, int Y, int a[]) {
int i;
for (i=2; i<1000; i+=4) {
a[i+0] = a[i-1+0]*a[i-2+0];
a[i+1] = a[i-1+1]*a[i-2+1];
a[i+2] = a[i-1+2]*a[i-2+2];
a[i+3] = a[i-1+3]*a[i-2+3];
}
}
//===---------------------------------------------------------------------===//