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[Bug inline-asm/31693] Incorrectly assigned registers to operands for ARM inline asm
- From: "rearnsha at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 10 Feb 2009 14:36:21 -0000
- Subject: [Bug inline-asm/31693] Incorrectly assigned registers to operands for ARM inline asm
- References: <bug-31693-14457@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #6 from rearnsha at gcc dot gnu dot org 2009-02-10 14:36 -------
This is not a bug, but a problem with your source code.
In order to understand why, you need to pre-process the code and look at the
output:
...
void *memset_arm9(void *a, int b, int c)
{
return ({ uint8_t *dst = ((uint8_t *)a); uint8_t c = (b); int count = (c);
uin
t32_t dummy0, dummy1, dummy2; __asm__ __volatile__ (
Notice that first there is a declaration of a variable c (uint8_t), then in the
next statement there is a use of c. This use (which is intended to be of the
formal parameter passed to memset_arm9 is instead interpreted as the newly
declared variable c (the uint8 one).
Compiling your testcase with -Wshadow gives:
inl.c: In function 'memset_arm9':
inl.c:66: warning: declaration of 'c' shadows a parameter
inl.c:64: warning: shadowed declaration is here
--
rearnsha at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |rearnsha at gcc dot gnu dot
| |org
Status|UNCONFIRMED |RESOLVED
Resolution| |INVALID
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31693