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| author | Nick Lewycky <nicholas@mxc.ca> | 2011-01-12 09:06:19 +0000 |
|---|---|---|
| committer | Nick Lewycky <nicholas@mxc.ca> | 2011-01-12 09:06:19 +0000 |
| commit | e45f2dfde651c01aafa73e7708ebd76881427690 (patch) | |
| tree | f8e423db62d364bbc7b89eb9f6bcb17f5a46756c | |
| parent | 860b64cb1efba110bf81bcc243a6fbaae4c655a4 (diff) | |
Add another note taken from the gcc bugzilla.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123315 91177308-0d34-0410-b5e6-96231b3b80d8
| -rw-r--r-- | lib/Target/ARM/README-Thumb.txt | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/lib/Target/ARM/README-Thumb.txt b/lib/Target/ARM/README-Thumb.txt index 6b605bb0a7..463c440852 100644 --- a/lib/Target/ARM/README-Thumb.txt +++ b/lib/Target/ARM/README-Thumb.txt @@ -68,7 +68,7 @@ LPCRELL0: //===---------------------------------------------------------------------===// -We compiles the following: +We compile the following: define i16 @func_entry_2E_ce(i32 %i) { 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, 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. + +//===---------------------------------------------------------------------===// + +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. |