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I2S input operations now in ASM due to compiler adding extra setc instructions. Performance opt only (Compiler bug #15256)

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This commit is contained in:
Ross Owen
2014-10-28 12:08:32 +00:00
parent c5bf653180
commit 730c043ad5
1 changed files with 6 additions and 2 deletions
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8
module_usb_audio/audio.xc
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@@ -601,7 +601,9 @@ chanend ?c_adc)
#pragma loop unroll #pragma loop unroll
for(int i = 1; i < I2S_CHANS_ADC; i += 2) for(int i = 1; i < I2S_CHANS_ADC; i += 2)
{ {
p_i2s_adc[index++] :> sample; // p_i2s_adc[index++] :> sample;
// Manual IN instruction since compiler generates an extra setc per IN (bug #15256)
asm("in %0, res[%1]" : "=r"(sample) : "r"(p_i2s_adc[index++]));
#if NUM_USB_CHAN_IN > 0 #if NUM_USB_CHAN_IN > 0
samplesIn[i] = bitrev(sample); samplesIn[i] = bitrev(sample);
@@ -662,7 +664,9 @@ chanend ?c_adc)
#pragma loop unroll #pragma loop unroll
for(int i = 1; i < I2S_CHANS_ADC; i += 2) for(int i = 1; i < I2S_CHANS_ADC; i += 2)
{ {
p_i2s_adc[index++] :> sample; // p_i2s_adc[index++] :> sample;
// Manual IN instruction since compiler generates an extra setc per IN (bug #15256)
asm("in %0, res[%1]" : "=r"(sample) : "r"(p_i2s_adc[index++]));
#if NUM_USB_CHAN_IN > 0 #if NUM_USB_CHAN_IN > 0
samplesInPrev[i] = bitrev(sample); samplesInPrev[i] = bitrev(sample);