wangtao
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Add another note taken from the gcc bugzilla. 

llvm-svn: 123315
This commit is contained in:
Nick Lewycky 2011-01-12 09:06:19 +00:00
parent 39c7980772
commit 7ecc2fc4ca
1 changed files with 20 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
llvm/lib/Target/ARM/README-Thumb.txt
View File

@ -68,7 +68,7 @@ LPCRELL0:
//===---------------------------------------------------------------------===// //===---------------------------------------------------------------------===//
We compiles the following: We compile the following:
define i16 @func_entry_2E_ce(i32 %i) { define i16 @func_entry_2E_ce(i32 %i) {
switch i32 %i, label %bb12.exitStub [ switch i32 %i, label %bb12.exitStub [
@ -246,3 +246,22 @@ Thumb2.
Rather than having tBR_JTr print a ".align 2" and constant island pass pad it, Rather than having tBR_JTr print a ".align 2" and constant island pass pad it,
add a target specific ALIGN instruction instead. That way, GetInstSizeInBytes add a target specific ALIGN instruction instead. That way, GetInstSizeInBytes
won't have to over-estimate. It can also be used for loop alignment pass. won't have to over-estimate. It can also be used for loop alignment pass.
//===---------------------------------------------------------------------===//
We generate conditional code for icmp when we don't need to. This code:
int foo(int s) {
return s == 1;
}
produces:
foo:
cmp r0, #1
mov.w r0, #0
it eq
moveq r0, #1
bx lr
when it could use subs + adcs. This is GCC PR46975.