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authorPetar Jovanovic <petar.jovanovic@imgtec.com>2013-04-15 13:54:07 +0200
committerAurelien Jarno <aurelien@aurel32.net>2013-04-15 16:07:57 +0200
commitb1ca31d7ce648a10e3513bb4b5e7f89a8702aec7 (patch)
tree6afd4ed29078d01fc1253ac0b78a3f81de016527 /target-mips/dsp_helper.c
parente3d142d073d02f0a3a4aad79eb838c15b6f99c01 (diff)
downloadqemu-arm-b1ca31d7ce648a10e3513bb4b5e7f89a8702aec7.tar.gz
target-mips: fix mipsdsp_mul_q15_q15 and tests for MAQ_SA_W_PHL/PHR
The operands for MAQ_SA_W.PHL/MAQ_SA_W.PHR must in specified format. Otherwise, the results are unpredictable. Once the operands were corrected in the tests (part of this change), a bug in mipsdsp_mul_q15_q15 became visible. This change corrects the tests for MAQ_SA_W.PHL/MAQ_SA_W.PHR and fixes sign-related issue in mipsdsp_mul_q15_q15. It also removes unnecessary comment. Signed-off-by: Petar Jovanovic <petar.jovanovic@imgtec.com>
Diffstat (limited to 'target-mips/dsp_helper.c')
-rw-r--r--target-mips/dsp_helper.c14
1 files changed, 1 insertions, 13 deletions
diff --git a/target-mips/dsp_helper.c b/target-mips/dsp_helper.c
index c7df595c9b..f975da08c4 100644
--- a/target-mips/dsp_helper.c
+++ b/target-mips/dsp_helper.c
@@ -269,18 +269,6 @@ static inline int32_t mipsdsp_sat32_acc_q31(int32_t acc, int32_t a,
temp31 = (temp_sum >> 31) & 0x01;
result = temp_sum & 0xFFFFFFFF;
- /* FIXME
- This sat function may wrong, because user manual wrote:
- temp127..0 ← temp + ( (signA) || a31..0
- if ( temp32 ≠ temp31 ) then
- if ( temp32 = 0 ) then
- temp31..0 ← 0x80000000
- else
- temp31..0 ← 0x7FFFFFFF
- endif
- DSPControlouflag:16+acc ← 1
- endif
- */
if (temp32 != temp31) {
if (temp32 == 0) {
result = 0x7FFFFFFF;
@@ -578,7 +566,7 @@ static inline int32_t mipsdsp_mul_q15_q15(int32_t ac, uint16_t a, uint16_t b,
temp = 0x7FFFFFFF;
set_DSPControl_overflow_flag(1, 16 + ac, env);
} else {
- temp = ((uint32_t)a * (uint32_t)b) << 1;
+ temp = ((int16_t)a * (int16_t)b) << 1;
}
return temp;