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[Bug target/29900] [4.3 regression] stackreg to go wrongs after fwprop
- From: "hjl at lucon dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 20 Nov 2006 14:26:32 -0000
- Subject: [Bug target/29900] [4.3 regression] stackreg to go wrongs after fwprop
- References: <bug-29900-682@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #7 from hjl at lucon dot org 2006-11-20 14:26 -------
A smaller testcase:
bash-3.1$ cat foo.f90
SUBROUTINE foo(IU, JU, IIL, JJL, XI, YJ, ALBTAB, XALB)
INTEGER, INTENT(IN) :: IU, JU, IIL, JJL
REAL, INTENT(IN) :: XI, YJ
REAL, DIMENSION(4, 5), INTENT(IN) :: ALBTAB
REAL, INTENT(OUT) :: XALB
XALB=ALBTAB(IU,JU)*(XI-IIL)*(YJ-JJL)+ALBTAB(IIL,JJL)*(IU-XI)*(JU-YJ)
END SUBROUTINE foo
With -O2, I got
(insn:TI 35 67 88 2 (set (reg:SF 11 st(3))
(minus:SF (reg:SF 8 st)
(reg:SF 11 st(3)))) 606 {*fop_sf_1_i387} (nil)
(expr_list:REG_DEAD (reg:SF 8 st)
(nil)))
SF 11 is never set before.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29900