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[Bug target/29900] [4.3 regression] stackreg to go wrongs after fwprop
- From: "pinskia at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 19 Nov 2006 21:01:42 -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 #5 from pinskia at gcc dot gnu dot org 2006-11-19 21:01 -------
regstack is broken.
Before:
(insn:TI 70 69 71 3 (set (reg:SF 13 st(5) [orig:80 pretmp.77 ] [80])
(plus:SF (reg:SF 13 st(5) [orig:80 pretmp.77 ] [80])
(reg:SF 12 st(4) [orig:70 pretmp.92 ] [70]))) 417
{*fop_sf_comm_i387} (nil)
(expr_list:REG_DEAD (reg:SF 12 st(4) [orig:70 pretmp.92 ] [70])
(nil)))
(insn:TI 71 70 72 3 (set (reg:SF 13 st(5) [orig:80 pretmp.77 ] [80])
(plus:SF (reg:SF 13 st(5) [orig:80 pretmp.77 ] [80])
(reg:SF 10 st(2) [orig:76 pretmp.84 ] [76]))) 417
{*fop_sf_comm_i387} (nil)
(expr_list:REG_DEAD (reg:SF 10 st(2) [orig:76 pretmp.84 ] [76])
(nil)))
After:
(insn:TI 70 69 71 3 (set (reg:SF 9 st(1))
(plus:SF (reg:SF 9 st(1))
(reg:SF 8 st))) 417 {*fop_sf_comm_i387} (nil)
(expr_list:REG_DEAD (reg:SF 8 st)
(nil)))
(insn:TI 71 70 72 3 (set (reg:SF 11 st(3))
(plus:SF (reg:SF 11 st(3))
(reg:SF 8 st))) 417 {*fop_sf_comm_i387} (nil)
(expr_list:REG_DEAD (reg:SF 8 st)
(nil)))
See how we replace "reg:SF 13 st(5) " once with "(reg:SF 9 st(1))" but the
second time with "(reg:SF 11 st(3))"
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29900