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authorAurelien Jarno <aurelien@aurel32.net>2016-04-21 10:48:49 +0200
committerPeter Maydell <peter.maydell@linaro.org>2016-04-21 15:41:47 +0100
commiteabb7b91b36b202b4dac2df2d59d698e3aff197a (patch)
tree396e93ab6764d975f7c2492f995e1c6462fae3f8 /tcg/s390
parentb4850e5ae9607f9f31932f693ca48f52619493d7 (diff)
tcg: use tcg_debug_assert instead of assert (fix performance regression)
The TCG code is quite performance sensitive, but at the same time can also be quite tricky. That is why asserts that can be enabled with the --enable-debug-tcg configure option. This used to work the following way: | #include "config.h" | | ... | | #if !defined(CONFIG_DEBUG_TCG) && !defined(NDEBUG) | /* define it to suppress various consistency checks (faster) */ | #define NDEBUG | #endif | | ... | | #include <assert.h> Since commit 757e725b (tcg: Clean up includes) "config.h" as been replaced by "qemu/osdep.h" which itself includes <assert.h>. As a consequence the assertions are always enabled, even when using --disable-debug-tcg, causing a performance regression, especially on targets with many registers. For instance on qemu-system-ppc the speed difference is about 15%. tcg_debug_assert is controlled directly by CONFIG_DEBUG_TCG and already uses in some places. This patch replaces all the calls to assert into calss to tcg_debug_assert. Cc: Peter Maydell <peter.maydell@linaro.org> Cc: Richard Henderson <rth@twiddle.net> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net> Message-id: 1461228530-14852-1-git-send-email-aurelien@aurel32.net Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'tcg/s390')
-rw-r--r--tcg/s390/tcg-target.inc.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/tcg/s390/tcg-target.inc.c b/tcg/s390/tcg-target.inc.c
index fbf97bb2e1..8b30256e4f 100644
--- a/tcg/s390/tcg-target.inc.c
+++ b/tcg/s390/tcg-target.inc.c
@@ -348,15 +348,15 @@ static void patch_reloc(tcg_insn_unit *code_ptr, int type,
intptr_t value, intptr_t addend)
{
intptr_t pcrel2 = (tcg_insn_unit *)value - (code_ptr - 1);
- assert(addend == -2);
+ tcg_debug_assert(addend == -2);
switch (type) {
case R_390_PC16DBL:
- assert(pcrel2 == (int16_t)pcrel2);
+ tcg_debug_assert(pcrel2 == (int16_t)pcrel2);
tcg_patch16(code_ptr, pcrel2);
break;
case R_390_PC32DBL:
- assert(pcrel2 == (int32_t)pcrel2);
+ tcg_debug_assert(pcrel2 == (int32_t)pcrel2);
tcg_patch32(code_ptr, pcrel2);
break;
default: