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| author | Chris Lattner <sabre@nondot.org> | 2007-02-02 04:36:46 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2007-02-02 04:36:46 +0000 |
| commit | 2d1222c060f56909c57c7828b6cad6a3e25017e2 (patch) | |
| tree | df9c1a625e043f4d85b440dbda7dc1c66ac36230 /lib/Target/ARM/README.txt | |
| parent | e1888eec1048e251fa8c6ede7e170430b69e95ce (diff) | |
| download | llvm-2d1222c060f56909c57c7828b6cad6a3e25017e2.tar.gz llvm-2d1222c060f56909c57c7828b6cad6a3e25017e2.tar.bz2 llvm-2d1222c060f56909c57c7828b6cad6a3e25017e2.tar.xz | |
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33778 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/ARM/README.txt')
| -rw-r--r-- | lib/Target/ARM/README.txt | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/lib/Target/ARM/README.txt b/lib/Target/ARM/README.txt index 000e8e6450..04bf9588ad 100644 --- a/lib/Target/ARM/README.txt +++ b/lib/Target/ARM/README.txt @@ -43,6 +43,20 @@ Among the obvious wins, doing so can eliminate the need to custom expand copysign (i.e. we won't need to custom expand it to get the conditional negate). +This allows us to eliminate one instruction from: + +define i32 @_Z6slow4bii(i32 %x, i32 %y) { + %tmp = icmp sgt i32 %x, %y + %retval = select i1 %tmp, i32 %x, i32 %y + ret i32 %retval +} + +__Z6slow4bii: + cmp r0, r1 + movgt r1, r0 + mov r0, r1 + bx lr + //===---------------------------------------------------------------------===// Implement long long "X-3" with instructions that fold the immediate in. These |