Arnold Schwaighofer f9cea17f75 LoopVectorizer: integer division is not a reduction operation ...

Don't classify idiv/udiv as a reduction operation. Integer division is lossy.
For example : (1 / 2) * 4 != 4/2.

Example:

int a[] = { 2, 5, 2, 2}
int x = 80;

for()
  x /= a[i];

Scalar:
  x /= 2 // = 40
  x /= 5 // = 8
  x /= 2 // = 4
  x /= 2 // = 2

Vectorized:

 <80, 1> / <2,5> //= <40,0>
 <40, 0> / <2,2> //= <20,0>

 20*0 = 0

radar://13640654

llvm-svn: 179381

2013-04-12 15:15:19 +00:00

..

ARM

Adding simple cast cost to ARM

2013-01-29 23:31:38 +00:00

X86

LoopVectorizer: Pass OperandValueKind information to the cost model

2013-04-04 23:26:27 +00:00

12-12-11-if-conv.ll

Remove the -licm pass from the loop vectorizer test because the loop vectorizer does it now.

2013-01-09 01:20:59 +00:00

2012-10-20-infloop.ll

Force a fixed unroll count on the target independent tests.

2013-01-05 00:58:48 +00:00

2012-10-22-isconsec.ll

Force a fixed unroll count on the target independent tests.

2013-01-05 00:58:48 +00:00

bzip_reverse_loops.ll

Add support for reverse pointer induction variables. These are loops that contain pointers that count backwards.

2013-01-23 01:35:00 +00:00

calloc.ll

Remove the -licm pass from the loop vectorizer test because the loop vectorizer does it now.

2013-01-09 01:20:59 +00:00

cast-induction.ll

Remove the -licm pass from the loop vectorizer test because the loop vectorizer does it now.

2013-01-09 01:20:59 +00:00

cpp-new-array.ll

Remove the -licm pass from the loop vectorizer test because the loop vectorizer does it now.

2013-01-09 01:20:59 +00:00

dbg.value.ll

LoopVectorizer: Ignore dbg.value instructions

2013-03-09 15:56:34 +00:00

flags.ll

Remove the -licm pass from the loop vectorizer test because the loop vectorizer does it now.

2013-01-09 01:20:59 +00:00

float-reduction.ll

LoopVectorizer: Add support for floating point reductions

2013-01-07 23:13:00 +00:00

gcc-examples.ll

Remove the -licm pass from the loop vectorizer test because the loop vectorizer does it now.

2013-01-09 01:20:59 +00:00

global_alias.ll

Test case hygiene.

2013-03-09 18:25:40 +00:00

i8-induction.ll

Fix PR14547. Handle induction variables of small sizes smaller than i32 (i8 and i16).

2013-01-13 07:56:29 +00:00

if-conv-crash.ll

Force a fixed unroll count on the target independent tests.

2013-01-05 00:58:48 +00:00

if-conversion-reduction.ll

Remove the -licm pass from the loop vectorizer test because the loop vectorizer does it now.

2013-01-09 01:20:59 +00:00

if-conversion.ll

Remove the -licm pass from the loop vectorizer test because the loop vectorizer does it now.

2013-01-09 01:20:59 +00:00

increment.ll

Remove the -licm pass from the loop vectorizer test because the loop vectorizer does it now.

2013-01-09 01:20:59 +00:00

induction_plus.ll

Force a fixed unroll count on the target independent tests.

2013-01-05 00:58:48 +00:00

intrinsic.ll

LoopVectorize: Vectorize math builtin calls.

2013-02-27 15:24:19 +00:00

lcssa-crash.ll

Force a fixed unroll count on the target independent tests.

2013-01-05 00:58:48 +00:00

lit.local.cfg

…

no_idiv_reduction.ll

LoopVectorizer: integer division is not a reduction operation

2013-04-12 15:15:19 +00:00

no_int_induction.ll

Remove the -licm pass from the loop vectorizer test because the loop vectorizer does it now.

2013-01-09 01:20:59 +00:00

nofloat.ll

Remove the -licm pass from the loop vectorizer test because the loop vectorizer does it now.

2013-01-09 01:20:59 +00:00

non-const-n.ll

Remove the -licm pass from the loop vectorizer test because the loop vectorizer does it now.

2013-01-09 01:20:59 +00:00

nsw-crash.ll

LoopVectorizer: Fix a bug in the vectorization of BinaryOperators. The BinaryOperator can be folded to an Undef, and we don't want to set NSW flags to undef vals.

2013-01-10 17:34:39 +00:00

phi-hang.ll

LoopVectorize: Don't hang forever if a PHI only has skipped PHI uses.

2013-03-01 19:07:31 +00:00

ptr_loops.ll

Add support for reverse pointer induction variables. These are loops that contain pointers that count backwards.

2013-01-23 01:35:00 +00:00

read-only.ll

Remove the -licm pass from the loop vectorizer test because the loop vectorizer does it now.

2013-01-09 01:20:59 +00:00

reduction.ll

Remove the -licm pass from the loop vectorizer test because the loop vectorizer does it now.

2013-01-09 01:20:59 +00:00

runtime-check.ll

LoopVectorizer: Emit memory checks into their own basic block.

2013-01-19 13:57:58 +00:00

same-base-access.ll

Remove the -licm pass from the loop vectorizer test because the loop vectorizer does it now.

2013-01-09 01:20:59 +00:00

scalar-select.ll

Remove the -licm pass from the loop vectorizer test because the loop vectorizer does it now.

2013-01-09 01:20:59 +00:00

simple-unroll.ll

Remove the -licm pass from the loop vectorizer test because the loop vectorizer does it now.

2013-01-09 01:20:59 +00:00

small-loop.ll

Remove the -licm pass from the loop vectorizer test because the loop vectorizer does it now.

2013-01-09 01:20:59 +00:00

start-non-zero.ll

Force a fixed unroll count on the target independent tests.

2013-01-05 00:58:48 +00:00

struct_access.ll

Add support for reverse pointer induction variables. These are loops that contain pointers that count backwards.

2013-01-23 01:35:00 +00:00

vectorize-once.ll

PR14448 - prevent the loop vectorizer from vectorizing the same loop twice.

2013-03-02 01:33:49 +00:00

write-only.ll

Remove the -licm pass from the loop vectorizer test because the loop vectorizer does it now.

2013-01-09 01:20:59 +00:00