In auditing the DOM code to see what the scoped tables catch that ranger doesn't, I've run accross this test, which seems to have uninitialized reads from both j and present[].
>From the original PR, it looks like this came from a reduction of a failing test in SPEC's 464.h264ref. A google search of the CalculateQuant8Param() in the test yields: https://github.com/microsoft/test-suite/blob/master/MultiSource/Applications/JM/lencod/q_matrix.c Assuming the above source is similar to the original testcase, it looks like both "j" and "present" were initialized before use, so our testcase just got reduced a bit too far. I tried to build the offending commit to see if my adjustments to the test still caused it to fail: commit e1449456c0a88f5b3122db5452f7e91f5a9535f6 (HEAD -> master) Author: Sebastian Pop <sebastian....@amd.com> Date: Wed May 26 16:46:59 2010 +0000 Reorganize the analysis of basic block predication. ...but alas it no longer builds with a recent compiler. Perhaps someone has a ./cc1 of that revision around to verify? OK? gcc/testsuite/ChangeLog: * gcc.dg/tree-ssa/pr44306.c: Remove undefined behavior. --- gcc/testsuite/gcc.dg/tree-ssa/pr44306.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/gcc/testsuite/gcc.dg/tree-ssa/pr44306.c b/gcc/testsuite/gcc.dg/tree-ssa/pr44306.c index 1ea04ce3a98..d322fe048b5 100644 --- a/gcc/testsuite/gcc.dg/tree-ssa/pr44306.c +++ b/gcc/testsuite/gcc.dg/tree-ssa/pr44306.c @@ -8,10 +8,10 @@ int LevelScale8x8Luma_Inter[6][8][8]; int InvLevelScale8x8Luma_Intra[6][8][8]; int InvLevelScale8x8Luma_Inter[6][8][8]; short UseDefaultScalingMatrix8x8Flag[2]; -void CalculateQuant8Param() +int present[2]; +void CalculateQuant8Param(int j) { - int i, j, k, temp; - int present[2]; + int i, k, temp; for(k=0; j<8; j++) for(i=0; i<8; i++) { -- 2.41.0
