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[Bug c/21171] Generates wrong code (w/ optimization) when copying data from a table to a table in a structure
- From: "sami dot kantoluoto at embedtronics dot fi" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 23 Apr 2005 08:31:11 -0000
- Subject: [Bug c/21171] Generates wrong code (w/ optimization) when copying data from a table to a table in a structure
- References: <20050423081814.21171.sami.kantoluoto@embedtronics.fi>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Additional Comments From sami dot kantoluoto at embedtronics dot fi 2005-04-23 08:31 -------
Created an attachment (id=8713)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=8713&action=view)
A bit more simplified test file with a test code that gets compiled correctly
commented out.
Code that gets compiled _corretly_:
*(&CPUReg->SVR[c]) = __IntTable[c];
And code that doesn't:
CPUReg->SVR[c] = __IntTable[c];
Objdump of working code:
test.o: file format elf32-littlearm
Disassembly of section .text:
00000000 <main>:
0: e59f101c ldr r1, [pc, #28] ; 24 <.text+0x24>
4: e59f001c ldr r0, [pc, #28] ; 28 <.text+0x28>
8: e4912004 ldr r2, [r1], #4
c: e59f3018 ldr r3, [pc, #24] ; 2c <.text+0x2c>
10: e1510003 cmp r1, r3
14: e4802004 str r2, [r0], #4
18: 1a000000 bne 8 <main+0x8>
1c: e3a00000 mov r0, #0 ; 0x0
20: e12fff1e bx lr
(this could be optimized by not reloading the r3 every loop).
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21171