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target-arm: convert sar, shl and shr helpers to TCG

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Now that the movcond TCG op is available, it's possible to replace
shl and shr helpers by TCG code. The code generated by TCG is slightly
longer than the code generated by GCC for the helper but is still worth
it as this avoid all the consequences of using an helper: globals saved
back to memory, no possible optimization, call overhead, etc.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Aurelien Jarno 2012-10-05 15:04:44 +01:00 • committed by Peter Maydell
parent 72485ec4f6
commit 365af80e47
3 changed files with 43 additions and 33 deletions
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24
target-arm/op_helper.c
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@ -355,30 +355,6 @@ uint32_t HELPER(sbc_cc)(CPUARMState *env, uint32_t a, uint32_t b)
/* Similarly for variable shift instructions. */
uint32_t HELPER(shl)(CPUARMState *env, uint32_t x, uint32_t i)
{
int shift = i & 0xff;
if (shift >= 32)
return 0;
return x << shift;
}
uint32_t HELPER(shr)(CPUARMState *env, uint32_t x, uint32_t i)
{
int shift = i & 0xff;
if (shift >= 32)
return 0;
return (uint32_t)x >> shift;
}
uint32_t HELPER(sar)(CPUARMState *env, uint32_t x, uint32_t i)
{
int shift = i & 0xff;
if (shift >= 32)
shift = 31;
return (int32_t)x >> shift;
}
uint32_t HELPER(shl_cc)(CPUARMState *env, uint32_t x, uint32_t i)
{
int shift = i & 0xff;