[Bug target/20331] New: Wrong code generation for the argument of the pure function in PIC

["kkojima at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

The C code below

extern __attribute__((pure)) int pf (int *);
extern int bar;

int foo (void) { return pf (&bar);}

is wrongly compiled with -fPIC on sh64-elf.  The output doesn't
any references to the symbol bar:

	.section	.text..SHmedia32,"ax"
	.align 2
	.global	_foo
	.type	_foo, @function
_foo:
	addi.l	r15, -24, r15
	st.l	r15, 12, r18
	st.l	r15, 8, r14
	st.l	r15, 4, r12
	movi	(((datalabel _GLOBAL_OFFSET_TABLE_-(.LPCS0-.)) >> 16) & 65535), r12
	shori	((datalabel _GLOBAL_OFFSET_TABLE_-(.LPCS0-.)) & 65535), r12
	.LPCS0: ptrel/u	r12, tr0
	gettr	tr0, r12
	add.l	r15, r63, r14
	ld.l	r2, 0, r2
	movi	(((_pf@GOTPLT) >> 16) & 65535), r1
	shori	((_pf@GOTPLT) & 65535), r1
	ldx.l	r1, r12, r1
	ptabs	r1, tr0
	blink	tr0, r18
	add.l	r14, r63, r15
	ld.l	r15, 4, r12
	ld.l	r15, 8, r14
	ld.l	r15, 12, r18
	addi.l	r15, 24, r15
	ptabs	r18, tr0
	blink	tr0, r63
	.size	_foo, .-_foo

I confirmed that 3.4/4.0 behaves same and 3.3.6 compiler produces
the sane code.  So this is a regression from 3.3 to 3.4/4.0/4.1.

-- 
           Summary: Wrong code generation for the argument of the pure
                    function in PIC
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: normal
          Priority: P2
         Component: target
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: kkojima at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: sh64-unknown-elf


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20331