POGO fails to optimize guard on select from shape() expression.

Bugzilla Link	1200
Created on	Aug 03, 2017 17:24
Resolution	FIXED
Resolved on	Aug 07, 2017 23:16
Version	svn
OS	Linux
Architecture	PC
Attachments	SCSprf_val_le_val_VxV.sac

Extended Description

Created an attachment (id=1065)
source code to reproduce failure
This unit test fails:
~/sac/testsuite/optimizations/pogo$ vi SCSprf_val_le_val_VxV.sac
sac@rattler:~/sac/testsuite/optimizations/pogo$ UnitTestRunGrep1 SCSprf_val_le_val_VxV.sac
 
...
 
Greptest: SCSprf_val_le_val_VxV.sac -check c -dopogo -noggs -dolacsi -dowlf -nopwlf -noawlf -noctz -norelcf -noainl -doplur failed with 3 hits on phrase "val_l". Wanted 2 hits
sac@rattler:~/sac/testsuite/optimizations/pogo$ vi grepd
sac@rattler:~/sac/testsuite/optimizations/pogo$ ^C
sac@rattler:~/sac/testsuite/optimizations/pogo$ sac2c -V
sac2c 1.2-beta-BlackForest-569-ge881c2
build-type: DEBUG
built-by: "sac" at 2017-07-21T17:03:33
The offending code is:
  _flat_3 = 0;
  v1 = _MAIN::id( _flat_2, _flat_7) ; 
  _isaa_3058_v1 = _shape_A_( v1); 
  _isaa_3059_v1 = _saabind_( _flat_4, _isaa_3058_v1, v1); 
  _uprf_2654 = _idx_sel_( _flat_3, _isaa_3058_v1); 
  _uprf_2643, _uprf_2644 = _val_le_val_SxS_( _flat_3, _uprf_2654); 
The fault is likely in PHUT, which should be able to deduce that
_uprf_2654 is an element of a shape vector, and hence is non-negative.