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AB1601编译优化参数引发的问题

發(fā)布時(shí)間：2025/3/21 编程问答 12 豆豆

生活随笔收集整理的這篇文章主要介紹了 AB1601编译优化参数引发的问题小編覺得挺不錯(cuò)的,現(xiàn)在分享給大家,幫大家做個(gè)參考.

現(xiàn)象：優(yōu)化級別為-Os時(shí)，lcd不顯示，spi接口波形信號有偏差。為-O0時(shí)顯示正常。

相關(guān)代碼：

void DRV_SPI_No_Wait_WriteRead (uint8_t* txbuf, uint16_t txsize, uint8_t* rxbuf, uint16_t rxsize)
{
SPI.TXSRCADDR.reg = (uint32_t)txbuf;
SPI.RXDSTADDR.reg = (uint32_t)rxbuf;
SPI.TBC.reg = txsize;
SPI.RBC.reg = rxsize;
SPI.TXFIFOSZ.reg = txsize + 1;
SPI.RXFIFOSZ.reg = rxsize + 1;
SPI.TXWPTR.field.PTR = txsize;

SPI.RXRPTR.field.PTR = 0;

SPI.CONTROL.field.START = 1;

? ? while(! SPI.STATUS.field.READY);
}

void LcdSpiWriteOneByte(U8 regData)
{
U8 spi_tx_buf[256];
spi_tx_buf[0] = regData;

SPI.TXSRCADDR.reg = (uint32_t)spi_tx_buf;
SPI.RXDSTADDR.reg = (uint32_t)SpiRxBuf;
SPI.TBC.reg = 1;
SPI.RBC.reg = 0;
SPI.TXFIFOSZ.reg = 1 + 1;
SPI.RXFIFOSZ.reg = 0 + 1;
SPI.TXWPTR.field.PTR = 1;

SPI.RXRPTR.field.PTR = 0;

SPI.CONTROL.field.START = 1;

? ? while(! SPI.STATUS.field.READY);
}

-Os時(shí)匯編碼：

000940a0 <LcdSpiWriteOneByte>:
? ?940a0: fc 00 ? ? ? push25 $r6,#0x0 ? ?! {$r6, $fp, $gp, $lp}
? ?940a2: ef 00 ? ? ? addi10.sp #-256
? ?940a4: 46 00 02 18 sethi $r0,#0x218
? ?940a8: 58 00 00 00 ori $r0,$r0,#0x0
? ?940ac: 3e 18 05 4c addi.gp $r1,#1356
? ?940b0: 15 f0 00 13 swi $sp,[$r0+#0x4c]
? ?940b4: 84 40 ? ? ? movi55 $r2,#0
? ?940b6: 14 10 00 16 swi $r1,[$r0+#0x58]
? ?940ba: 84 21 ? ? ? movi55 $r1,#1
? ?940bc: 14 10 00 14 swi $r1,[$r0+#0x50]
? ?940c0: 14 20 00 17 swi $r2,[$r0+#0x5c]
? ?940c4: 84 42 ? ? ? movi55 $r2,#2
? ?940c6: 14 20 00 12 swi $r2,[$r0+#0x48]
? ?940ca: 14 10 00 15 swi $r1,[$r0+#0x54]
? ?940ce: 46 2f ff 00 sethi $r2,#0xfff00
? ?940d2: a0 45 ? ? ? lwi333 $r1,[$r0+#0x14]
? ?940d4: fe 56 ? ? ? and33 $r1,$r2
? ?940d6: 58 10 80 01 ori $r1,$r1,#0x1
? ?940da: a8 45 ? ? ? swi333 $r1,[$r0+#0x14]
? ?940dc: a0 47 ? ? ? lwi333 $r1,[$r0+#0x1c]
? ?940de: fe 56 ? ? ? and33 $r1,$r2
? ?940e0: a8 47 ? ? ? swi333 $r1,[$r0+#0x1c]
? ?940e2: b4 20 ? ? ? lwi450 $r1,[$r0]
? ?940e4: 58 10 80 04 ori $r1,$r1,#0x4
? ?940e8: b6 20 ? ? ? swi450 $r1,[$r0]
? ?940ea: 04 10 00 0c lwi $r1,[$r0+#0x30]
? ?940ee: 96 4c ? ? ? xlsb33 $r1,$r1
? ?940f0: c1 fd ? ? ? beqz38 $r1,940ea <LcdSpiWriteOneByte+0x4a>
? ?940f2: ed 00 ? ? ? addi10.sp #256
? ?940f4: fc 80 ? ? ? pop25 $r6,#0x0 ? ?! {$r6, $fp, $gp, $lp}

00094052 <DRV_SPI_No_Wait_WriteRead>:
? ?94052: fc 00 ? ? ? push25 $r6,#0x0 ? ?! {$r6, $fp, $gp, $lp}
? ?94054: 46 40 02 18 sethi $r4,#0x218
? ?94058: 58 42 00 00 ori $r4,$r4,#0x0
? ?9405c: 96 49 ? ? ? zeh33 $r1,$r1
? ?9405e: 96 d9 ? ? ? zeh33 $r3,$r3
? ?94060: 14 02 00 13 swi $r0,[$r4+#0x4c]
? ?94064: 14 22 00 16 swi $r2,[$r4+#0x58]
? ?94068: 9c 09 ? ? ? addi333 $r0,$r1,#1
? ?9406a: 14 12 00 14 swi $r1,[$r4+#0x50]
? ?9406e: 14 32 00 17 swi $r3,[$r4+#0x5c]
? ?94072: 9c d9 ? ? ? addi333 $r3,$r3,#1
? ?94074: 14 02 00 12 swi $r0,[$r4+#0x48]
? ?94078: 14 32 00 15 swi $r3,[$r4+#0x54]
? ?9407c: 46 2f ff 00 sethi $r2,#0xfff00
? ?94080: a0 25 ? ? ? lwi333 $r0,[$r4+#0x14]
? ?94082: fe 16 ? ? ? and33 $r0,$r2
? ?94084: fe 47 ? ? ? or33 $r1,$r0
? ?94086: a8 65 ? ? ? swi333 $r1,[$r4+#0x14]
? ?94088: a0 27 ? ? ? lwi333 $r0,[$r4+#0x1c]
? ?9408a: fe 16 ? ? ? and33 $r0,$r2
? ?9408c: a8 27 ? ? ? swi333 $r0,[$r4+#0x1c]
? ?9408e: b4 04 ? ? ? lwi450 $r0,[$r4]
? ?94090: 58 00 00 04 ori $r0,$r0,#0x4
? ?94094: b6 04 ? ? ? swi450 $r0,[$r4]
? ?94096: 04 02 00 0c lwi $r0,[$r4+#0x30]
? ?9409a: 96 04 ? ? ? xlsb33 $r0,$r0
? ?9409c: c0 fd ? ? ? beqz38 $r0,94096 <DRV_SPI_No_Wait_WriteRead+0x44>
? ?9409e: fc 80 ? ? ? pop25 $r6,#0x0 ? ?! {$r6, $fp, $gp, $lp}

-O0時(shí)匯編碼：

0009411c <LcdSpiWriteOneByte>:
? ?9411c: fc 00 ? ? ? push25 $r6,#0x0 ? ?! {$r6, $fp, $gp, $lp}
? ?9411e: ee f8 ? ? ? addi10.sp #-264
? ?94120: 10 0f 80 04 sbi $r0,[$sp+#0x4]
? ?94124: b0 02 ? ? ? addri36.sp $r0,#0x8
? ?94126: 00 1f 80 04 lbi $r1,[$sp+#0x4]
? ?9412a: ae 40 ? ? ? sbi333 $r1,[$r0+#0x0]
? ?9412c: b0 02 ? ? ? addri36.sp $r0,#0x8
? ?9412e: 46 f0 02 18 sethi $r15,#0x218
? ?94132: 14 07 80 13 swi $r0,[$r15+#0x4c]
? ?94136: 3e 08 05 4c addi.gp $r0,#1356
? ?9413a: 46 f0 02 18 sethi $r15,#0x218
? ?9413e: 14 07 80 16 swi $r0,[$r15+#0x58]
? ?94142: 84 01 ? ? ? movi55 $r0,#1
? ?94144: 46 f0 02 18 sethi $r15,#0x218
? ?94148: 14 07 80 14 swi $r0,[$r15+#0x50]
? ?9414c: 84 00 ? ? ? movi55 $r0,#0
? ?9414e: 46 f0 02 18 sethi $r15,#0x218
? ?94152: 14 07 80 17 swi $r0,[$r15+#0x5c]
? ?94156: 84 02 ? ? ? movi55 $r0,#2
? ?94158: 46 f0 02 18 sethi $r15,#0x218
? ?9415c: 14 07 80 12 swi $r0,[$r15+#0x48]
? ?94160: 84 01 ? ? ? movi55 $r0,#1
? ?94162: 46 f0 02 18 sethi $r15,#0x218
? ?94166: 14 07 80 15 swi $r0,[$r15+#0x54]
? ?9416a: 46 f0 02 18 sethi $r15,#0x218
? ?9416e: 04 17 80 05 lwi $r1,[$r15+#0x14]
? ?94172: 46 0f ff 00 sethi $r0,#0xfff00
? ?94176: fe 0e ? ? ? and33 $r0,$r1
? ?94178: 58 00 00 01 ori $r0,$r0,#0x1
? ?9417c: 46 f0 02 18 sethi $r15,#0x218
? ?94180: 14 07 80 05 swi $r0,[$r15+#0x14]
? ?94184: 46 f0 02 18 sethi $r15,#0x218
? ?94188: 04 17 80 07 lwi $r1,[$r15+#0x1c]
? ?9418c: 46 0f ff 00 sethi $r0,#0xfff00
? ?94190: fe 0e ? ? ? and33 $r0,$r1
? ?94192: 46 f0 02 18 sethi $r15,#0x218
? ?94196: 14 07 80 07 swi $r0,[$r15+#0x1c]
? ?9419a: 46 f0 02 18 sethi $r15,#0x218
? ?9419e: 04 07 80 00 lwi $r0,[$r15+#0x0]
? ?941a2: 58 00 00 04 ori $r0,$r0,#0x4
? ?941a6: 46 f0 02 18 sethi $r15,#0x218
? ?941aa: 14 07 80 00 swi $r0,[$r15+#0x0]
? ?941ae: 46 f0 02 18 sethi $r15,#0x218
? ?941b2: 04 07 80 0c lwi $r0,[$r15+#0x30]
? ?941b6: 96 04 ? ? ? xlsb33 $r0,$r0
? ?941b8: c0 fb ? ? ? beqz38 $r0,941ae <LcdSpiWriteOneByte+0x92>
? ?941ba: ed 08 ? ? ? addi10.sp #264
? ?941bc: fc 80 ? ? ? pop25 $r6,#0x0 ? ?! {$r6, $fp, $gp, $lp}

00094052 <DRV_SPI_No_Wait_WriteRead>:
? ?94052: fc 02 ? ? ? push25 $r6,#0x10 ? ?! {$r6, $fp, $gp, $lp}
? ?94054: f0 83 ? ? ? swi37.sp $r0,[+#0xc]
? ?94056: f2 81 ? ? ? swi37.sp $r2,[+#0x4]
? ?94058: 80 03 ? ? ? mov55 $r0,$r3
? ?9405a: 12 1f 80 04 shi $r1,[$sp+#0x8]
? ?9405e: 12 0f 80 00 shi $r0,[$sp+#0x0]
? ?94062: f0 03 ? ? ? lwi37.sp $r0,[+#0xc]
? ?94064: 46 f0 02 18 sethi $r15,#0x218
? ?94068: 14 07 80 13 swi $r0,[$r15+#0x4c]
? ?9406c: f0 01 ? ? ? lwi37.sp $r0,[+#0x4]
? ?9406e: 46 f0 02 18 sethi $r15,#0x218
? ?94072: 14 07 80 16 swi $r0,[$r15+#0x58]
? ?94076: 02 0f 80 04 lhi $r0,[$sp+#0x8]
? ?9407a: 96 01 ? ? ? zeh33 $r0,$r0
? ?9407c: 46 f0 02 18 sethi $r15,#0x218
? ?94080: 14 07 80 14 swi $r0,[$r15+#0x50]
? ?94084: 02 0f 80 00 lhi $r0,[$sp+#0x0]
? ?94088: 96 01 ? ? ? zeh33 $r0,$r0
? ?9408a: 46 f0 02 18 sethi $r15,#0x218
? ?9408e: 14 07 80 17 swi $r0,[$r15+#0x5c]
? ?94092: 02 0f 80 04 lhi $r0,[$sp+#0x8]
? ?94096: 96 01 ? ? ? zeh33 $r0,$r0
? ?94098: 9c 01 ? ? ? addi333 $r0,$r0,#1
? ?9409a: 46 f0 02 18 sethi $r15,#0x218
? ?9409e: 14 07 80 12 swi $r0,[$r15+#0x48]
? ?940a2: 02 0f 80 00 lhi $r0,[$sp+#0x0]
? ?940a6: 96 01 ? ? ? zeh33 $r0,$r0
? ?940a8: 9c 01 ? ? ? addi333 $r0,$r0,#1
? ?940aa: 46 f0 02 18 sethi $r15,#0x218
? ?940ae: 14 07 80 15 swi $r0,[$r15+#0x54]
? ?940b2: 02 0f 80 04 lhi $r0,[$sp+#0x8]
? ?940b6: 96 41 ? ? ? zeh33 $r1,$r0
? ?940b8: 46 00 00 ff sethi $r0,#0xff
? ?940bc: 58 00 0f ff ori $r0,$r0,#0xfff
? ?940c0: fe 46 ? ? ? and33 $r1,$r0
? ?940c2: 46 00 00 ff sethi $r0,#0xff
? ?940c6: 58 00 0f ff ori $r0,$r0,#0xfff
? ?940ca: fe 46 ? ? ? and33 $r1,$r0
? ?940cc: 46 f0 02 18 sethi $r15,#0x218
? ?940d0: 04 27 80 05 lwi $r2,[$r15+#0x14]
? ?940d4: 46 0f ff 00 sethi $r0,#0xfff00
? ?940d8: fe 16 ? ? ? and33 $r0,$r2
? ?940da: fe 0f ? ? ? or33 $r0,$r1
? ?940dc: 46 f0 02 18 sethi $r15,#0x218
? ?940e0: 14 07 80 05 swi $r0,[$r15+#0x14]
? ?940e4: 46 f0 02 18 sethi $r15,#0x218
? ?940e8: 04 17 80 07 lwi $r1,[$r15+#0x1c]
? ?940ec: 46 0f ff 00 sethi $r0,#0xfff00
? ?940f0: fe 0e ? ? ? and33 $r0,$r1
? ?940f2: 46 f0 02 18 sethi $r15,#0x218
? ?940f6: 14 07 80 07 swi $r0,[$r15+#0x1c]
? ?940fa: 46 f0 02 18 sethi $r15,#0x218
? ?940fe: 04 07 80 00 lwi $r0,[$r15+#0x0]
? ?94102: 58 00 00 04 ori $r0,$r0,#0x4
? ?94106: 46 f0 02 18 sethi $r15,#0x218
? ?9410a: 14 07 80 00 swi $r0,[$r15+#0x0]
? ?9410e: 46 f0 02 18 sethi $r15,#0x218
? ?94112: 04 07 80 0c lwi $r0,[$r15+#0x30]
? ?94116: 96 04 ? ? ? xlsb33 $r0,$r0
? ?94118: c0 fb ? ? ? beqz38 $r0,9410e <DRV_SPI_No_Wait_WriteRead+0xbc>
? ?9411a: fc 82 ? ? ? pop25 $r6,#0x10 ? ?! {$r6, $fp, $gp, $lp}

沒看懂：果斷各種地方加volatile參數(shù)：）問題解決，我再也不用擔(dān)心優(yōu)化的問題了，就算O3也不怕。 volatile U8 SpiRxBuf[16];

void DRV_SPI_No_Wait_WriteRead (volatile uint8_t* txbuf, volatile uint16_t txsize, volatile uint8_t* rxbuf, volatile uint16_t rxsize)
{
SPI.TXSRCADDR.reg = (uint32_t)(&txbuf[0]);
SPI.RXDSTADDR.reg = (uint32_t)(&rxbuf[0]);
SPI.TBC.reg = txsize;
SPI.RBC.reg = rxsize;
SPI.TXFIFOSZ.reg = txsize + 1;
SPI.RXFIFOSZ.reg = rxsize + 1;
SPI.TXWPTR.field.PTR = txsize;

SPI.RXRPTR.field.PTR = 0;

SPI.CONTROL.field.START = 1;

? ? while(! SPI.STATUS.field.READY);
}

void LcdSpiWriteOneByte(volatile U8 regData)
{
volatile U8 spi_tx_buf[256];
spi_tx_buf[0] = regData;

SPI.TXSRCADDR.reg = (uint32_t)(&spi_tx_buf[0]);
SPI.RXDSTADDR.reg = (uint32_t)(&SpiRxBuf[0]);
SPI.TBC.reg = 1;
SPI.RBC.reg = 0;
SPI.TXFIFOSZ.reg = 1 + 1;
SPI.RXFIFOSZ.reg = 0 + 1;
SPI.TXWPTR.field.PTR = 1;

SPI.RXRPTR.field.PTR = 0;

SPI.CONTROL.field.START = 1;

? ? while(! SPI.STATUS.field.READY);
}

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