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[Bug tree-optimization/68892] [6 Regression] Excessive dead loads produced by BB vectorization
- From: "seurer at linux dot vnet.ibm.com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Wed, 16 Dec 2015 21:48:18 +0000
- Subject: [Bug tree-optimization/68892] [6 Regression] Excessive dead loads produced by BB vectorization
- Auto-submitted: auto-generated
- References: <bug-68892-4 at http dot gcc dot gnu dot org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68892
Bill Seurer <seurer at linux dot vnet.ibm.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |seurer at linux dot vnet.ibm.com
--- Comment #4 from Bill Seurer <seurer at linux dot vnet.ibm.com> ---
That fix broke the test case pr60203.c.
PASS: gcc.target/powerpc/pr60203.c (test for excess errors)
PASS: gcc.target/powerpc/pr60203.c scan-assembler-not stfd
FAIL: gcc.target/powerpc/pr60203.c scan-assembler-not lfd
PASS: gcc.target/powerpc/pr60203.c scan-assembler-not lxsdx
PASS: gcc.target/powerpc/pr60203.c scan-assembler-not stxsdx
PASS: gcc.target/powerpc/pr60203.c scan-assembler-not mfvsrd
PASS: gcc.target/powerpc/pr60203.c scan-assembler-not mtvsrd
There are two lfds and lots of other ops in the generated code with the fix
pack:
xxpermdi 0,2,1,0
addi 9,1,-16
xxpermdi 0,0,0,2
stxvd2x 0,0,9
lfd 1,-16(1)
lfd 2,-8(1)
blr
and none without
pack:
blr
Compiled with -mcpu=power8 -O3.