maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity
llvm-project/llvm/test/TableGen/2006-09-18-LargeInt.td

6 lines
72 B
TableGen
Raw Normal View History

Fun x86 encoding tricks: when adding an immediate value of 128, use a SUB instruction instead of an ADD, because -128 can be encoded in an 8-bit signed immediate field, while +128 can't be. This avoids the need for a 32-bit immediate field in this case. A similar optimization applies to 64-bit adds with 0x80000000, with the 32-bit signed immediate field. To support this, teach tablegen how to handle 64-bit constants. llvm-svn: 57663
2008-10-17 09:33:43 +08:00
// RUN: tblgen %s | grep -- 4294901760
new testcase llvm-svn: 30471
2006-09-19 06:28:07 +08:00
def X {
int Y = 0xFFFF0000;
}