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| author | Chris Lattner <sabre@nondot.org> | 2010-02-08 23:48:10 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2010-02-08 23:48:10 +0000 |
| commit | c133457269306ef8fa45b4e8990bc462e710feaf (patch) | |
| tree | 1c866544baa32e9b48df20a6d6a1e9cf486f195e | |
| parent | d863b766f57fb46d15ead90a48defa739b8393b5 (diff) | |
this is done, tested by CodeGen/ARM/iabs.ll
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95609 91177308-0d34-0410-b5e6-96231b3b80d8
| -rw-r--r-- | lib/Target/ARM/README.txt | 20 |
1 files changed, 0 insertions, 20 deletions
diff --git a/lib/Target/ARM/README.txt b/lib/Target/ARM/README.txt index a6f26a5dfe..9efb5a1426 100644 --- a/lib/Target/ARM/README.txt +++ b/lib/Target/ARM/README.txt @@ -71,26 +71,6 @@ were disabled due to badness with the ARM carry flag on subtracts. //===---------------------------------------------------------------------===// -We currently compile abs: -int foo(int p) { return p < 0 ? -p : p; } - -into: - -_foo: - rsb r1, r0, #0 - cmn r0, #1 - movgt r1, r0 - mov r0, r1 - bx lr - -This is very, uh, literal. This could be a 3 operation sequence: - t = (p sra 31); - res = (p xor t)-t - -Which would be better. This occurs in png decode. - -//===---------------------------------------------------------------------===// - More load / store optimizations: 1) Better representation for block transfer? This is from Olden/power: |