diff options
| author | Chris Lattner <sabre@nondot.org> | 2006-04-17 21:52:03 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2006-04-17 21:52:03 +0000 |
| commit | 22fcbb132008fcc6004dd4047b5a6ae06dbb7548 (patch) | |
| tree | ae83e3511d57420e39c9f36db7b3d7fadec6506e /lib/Target/PowerPC/README_ALTIVEC.txt | |
| parent | f9568d8700d5389799796262cde313bb5c7d588a (diff) | |
remove done item
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27778 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/PowerPC/README_ALTIVEC.txt')
| -rw-r--r-- | lib/Target/PowerPC/README_ALTIVEC.txt | 21 |
1 files changed, 2 insertions, 19 deletions
diff --git a/lib/Target/PowerPC/README_ALTIVEC.txt b/lib/Target/PowerPC/README_ALTIVEC.txt index 2887b798b0..2d91986f83 100644 --- a/lib/Target/PowerPC/README_ALTIVEC.txt +++ b/lib/Target/PowerPC/README_ALTIVEC.txt @@ -5,8 +5,8 @@ registers, to generate better spill code. //===----------------------------------------------------------------------===// -Altivec support. The first should be a single lvx from the constant pool, the -second should be a xor/stvx: +The first should be a single lvx from the constant pool, the second should be +a xor/stvx: void foo(void) { int x[8] __attribute__((aligned(128))) = { 1, 1, 1, 17, 1, 1, 1, 1 }; @@ -39,23 +39,6 @@ a load/store/lve*x sequence. //===----------------------------------------------------------------------===// -There are a wide range of vector constants we can generate with combinations of -altivec instructions. - -Examples, these work with all widths: - Splat(+/- 16,18,20,22,24,28,30): t = vspliti I/2, r = t+t - Splat(+/- 17,19,21,23,25,29): t = vsplti +/-15, t2 = vsplti I-15, r=t + t2 - Splat(31): t = vsplti FB, r = srl t,t - Splat(256): t = vsplti 1, r = vsldoi t, t, 1 - -Lots more are listed here: -http://www.informatik.uni-bremen.de/~hobold/AltiVec.html - -This should be added to the ISD::BUILD_VECTOR case in -PPCTargetLowering::LowerOperation. - -//===----------------------------------------------------------------------===// - FABS/FNEG can be codegen'd with the appropriate and/xor of -0.0. //===----------------------------------------------------------------------===// |