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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 | 08297ad15dbdfc8d8b3ad10146d96ad95dd8486e (patch) | |
| tree | eeb6078ddd8105877bf0012f0dfd6be8ce813757 /llvm/lib | |
| parent | ae67ca33ed14039653aeb70c310ee0f1182b04de (diff) | |
| download | bcm5719-llvm-08297ad15dbdfc8d8b3ad10146d96ad95dd8486e.tar.gz bcm5719-llvm-08297ad15dbdfc8d8b3ad10146d96ad95dd8486e.zip | |
this is done, tested by CodeGen/ARM/iabs.ll
llvm-svn: 95609
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/Target/ARM/README.txt | 20 |
1 files changed, 0 insertions, 20 deletions
diff --git a/llvm/lib/Target/ARM/README.txt b/llvm/lib/Target/ARM/README.txt index a6f26a5dfe1..9efb5a1426a 100644 --- a/llvm/lib/Target/ARM/README.txt +++ b/llvm/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: |
