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From: Anders Blomdell <andersb@localhost.localdomain> To: gcc-gnats@gcc.gnu.org Subject: optimization/6059: -fvolatile-global and -fvolatile-static fails to set volatile Date: Tue, 26 Mar 2002 02:46:00 -0000 [thread overview] Message-ID: <200203261038.g2QAcn101746@localhost.localdomain> (raw) >Number: 6059 >Category: optimization >Synopsis: -fvolatile-* doesn't mark variables as volatile >Confidential: no >Severity: serious >Priority: medium >Responsible: unassigned >State: open >Class: wrong-code >Submitter-Id: net >Arrival-Date: Tue Mar 26 02:46:10 PST 2002 >Closed-Date: >Last-Modified: >Originator: Anders Blomdell <anders.blomdell@control.lth.se> >Release: 3.0.4 >Organization: Department of Automatic Control >Environment: System: Linux aljazari 2.4.13-KURT #2 Thu Nov 8 10:49:33 CET 2001 i686 unknown Architecture: i686 host: i686-pc-linux-gnu build: i686-pc-linux-gnu target: m68k-unknown-elf configured with: ../../../gcc-3.0.4/configure --prefix=/usr/local/packages/cross/m68k-elf --target=m68k-elf --with-newlib : (reconfigured) ../../../gcc-3.0.4/configure --prefix=/usr/local/packages/cross/m68k-elf --target=m68k-elf --with-newlib : (reconfigured) ../../../gcc-3.0.4/configure --with-gcc-version-trigger=/work/aljazari2/andersb/gnu/gcc-3.0.4/gcc/version.c --host=i686-pc-linux-gnu --prefix=/usr/local/packages/cross/m68k-elf --target=m68k-elf --with-newlib --enable-checking=misc,tree,rtl,gc,gcac >Description: -fvolatile-* doesn't have the same effect as declaring a variable as volatile. >How-To-Repeat: Compile this small C program with -O*, where f and g should produce identical code when -fvolatile-* is specified. static int gi; static volatile int vgi; void f() { int i; for (i = 0 ; i < 1000 ; i++) { gi++; } } void vf() { int i; for (i = 0 ; i < 1000 ; i++) { vgi++; } } >Fix: Apply this patch: --- varasm.c~ Sat Sep 22 03:33:20 2001 +++ varasm.c Tue Mar 26 11:26:25 2002 @@ -743,7 +743,10 @@ && TREE_PUBLIC (decl)) || ((flag_volatile_static && TREE_CODE (decl) == VAR_DECL && (TREE_PUBLIC (decl) || TREE_STATIC (decl))))) - TREE_SIDE_EFFECTS (decl) = 1; + { + TREE_SIDE_EFFECTS (decl) = 1; + TREE_THIS_VOLATILE(decl) = 1; + } SET_DECL_RTL (decl, gen_rtx_MEM (DECL_MODE (decl), gen_rtx_SYMBOL_REF (Pmode, name))); >Release-Note: >Audit-Trail: >Unformatted:
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