gcc是否对我的可变变量重新排序？
我正在使用FreeRTOS开发带有GNU ARM工具链（gcc 5.4.1）的STM32F746（ARM Cortex-M7）。我正在使用以下CFLAGS集：gcc是否对我的可变变量重新排序？,gcc,optimization,arm,volatile,cortex-m,Gcc,Optimization,Arm,Volatile,Cortex M,我正在使用FreeRTOS开发带有GNU ARM工具链（gcc 5.4.1）的STM32F746（ARM Cortex-M7）。我正在使用以下CFLAGS集： -g -Werror -Wextra -O2 -fno-common -ffunction-sections -fmessage-length=0 -g -mcpu=cortex-m7 -mthumb -mfloat-abi=hard -mfpu=fpv5-sp-d16 -fno-common -ffunction-sections -
-g -Werror -Wextra -O2 -fno-common -ffunction-sections -fmessage-length=0 -g -mcpu=cortex-m7 -mthumb -mfloat-abi=hard -mfpu=fpv5-sp-d16 -fno-common -ffunction-sections -fmessage-length=0 -g -mcpu=cortex-m7 -mthumb -mfloat-abi=hard -mfpu=fpv5-sp-d16
/* *** Other peripheral configurations *** */
RCC->AHB1ENR |= RCC_AHB1ENR_DMA1EN;
DMA1_Stream3->CR = DMA_SxCR_PL | DMA_SxCR_MINC |
DMA_SxCR_TCIE | DMA_SxCR_TEIE | DMA_SxCR_DMEIE;
DEBUG_PRINTF("%x\r\n", DMA1_Stream3->CR);
/* *** Other peripheral configurations *** */
RCC->AHB1ENR |= RCC_AHB1ENR_DMA1EN;
__asm__ __volatile__ ("" ::: "memory");
DMA1_Stream3->CR = DMA_SxCR_PL | DMA_SxCR_MINC |
DMA_SxCR_TCIE | DMA_SxCR_TEIE | DMA_SxCR_DMEIE;
DEBUG_PRINTF("%x\r\n", DMA1_Stream3->CR);
typedef struct
{
/* ... */
__IO uint32_t AHB1ENR;
/* ... */
} RCC_TypeDef;
typedef struct
{
__IO uint32_t CR; /*!< DMA stream x configuration register */
__IO uint32_t NDTR; /*!< DMA stream x number of data register */
__IO uint32_t PAR; /*!< DMA stream x peripheral address register */
__IO uint32_t M0AR; /*!< DMA stream x memory 0 address register */
__IO uint32_t M1AR; /*!< DMA stream x memory 1 address register */
__IO uint32_t FCR; /*!< DMA stream x FIFO control register */
} DMA_Stream_TypeDef;
typedef结构
{
__IO uint32\u t CR；/*！08003f4c <bsp_initSPIADIS>:
8003f4c: 4956 ldr r1, [pc, #344] ; (80040a8 <bsp_initSPIADIS+0x15c>)
8003f4e: 4a57 ldr r2, [pc, #348] ; (80040ac <bsp_initSPIADIS+0x160>)
8003f50: 6b08 ldr r0, [r1, #48] ; 0x30
8003f52: f440 7080 orr.w r0, r0, #256 ; 0x100
8003f56: b5f8 push {r3, r4, r5, r6, r7, lr}
8003f58: 6308 str r0, [r1, #48] ; 0x30
8003f5a: 2500 movs r5, #0
8003f5c: 6810 ldr r0, [r2, #0]
8003f5e: f240 3607 movw r6, #775 ; 0x307
8003f62: 4b53 ldr r3, [pc, #332] ; (80040b0 <bsp_initSPIADIS+0x164>)
8003f64: f44f 5eb8 mov.w lr, #5888 ; 0x1700
8003f68: f020 000c bic.w r0, r0, #12
8003f6c: 4c51 ldr r4, [pc, #324] ; (80040b4 <bsp_initSPIADIS+0x168>)
8003f6e: 4f52 ldr r7, [pc, #328] ; (80040b8 <bsp_initSPIADIS+0x16c>)
8003f70: 6010 str r0, [r2, #0]
8003f72: 6810 ldr r0, [r2, #0]
8003f74: f040 0008 orr.w r0, r0, #8
8003f78: 6010 str r0, [r2, #0]
8003f7a: 6890 ldr r0, [r2, #8]
8003f7c: f020 000c bic.w r0, r0, #12
8003f80: 6090 str r0, [r2, #8]
8003f82: 6890 ldr r0, [r2, #8]
8003f84: f040 0004 orr.w r0, r0, #4
8003f88: 6090 str r0, [r2, #8]
8003f8a: 6890 ldr r0, [r2, #8]
8003f8c: f040 0008 orr.w r0, r0, #8
8003f90: 6090 str r0, [r2, #8]
8003f92: 6a10 ldr r0, [r2, #32]
8003f94: f020 00f0 bic.w r0, r0, #240 ; 0xf0
8003f98: 6210 str r0, [r2, #32]
8003f9a: 6a10 ldr r0, [r2, #32]
8003f9c: f040 0010 orr.w r0, r0, #16
8003fa0: 6210 str r0, [r2, #32]
8003fa2: 6a10 ldr r0, [r2, #32]
8003fa4: f040 0040 orr.w r0, r0, #64 ; 0x40
8003fa8: 6210 str r0, [r2, #32]
8003faa: 6b08 ldr r0, [r1, #48] ; 0x30
8003fac: 4a43 ldr r2, [pc, #268] ; (80040bc <bsp_initSPIADIS+0x170>)
8003fae: f040 0002 orr.w r0, r0, #2
8003fb2: 6308 str r0, [r1, #48] ; 0x30
8003fb4: 6818 ldr r0, [r3, #0]
8003fb6: f020 5040 bic.w r0, r0, #805306368 ; 0x30000000
8003fba: 6018 str r0, [r3, #0]
8003fbc: 6818 ldr r0, [r3, #0]
8003fbe: f040 5000 orr.w r0, r0, #536870912 ; 0x20000000
8003fc2: 6018 str r0, [r3, #0]
8003fc4: 6898 ldr r0, [r3, #8]
8003fc6: f020 5040 bic.w r0, r0, #805306368 ; 0x30000000
8003fca: 6098 str r0, [r3, #8]
8003fcc: 6898 ldr r0, [r3, #8]
8003fce: f040 5080 orr.w r0, r0, #268435456 ; 0x10000000
8003fd2: 6098 str r0, [r3, #8]
8003fd4: 6898 ldr r0, [r3, #8]
8003fd6: f040 5000 orr.w r0, r0, #536870912 ; 0x20000000
8003fda: 6098 str r0, [r3, #8]
8003fdc: 6a58 ldr r0, [r3, #36] ; 0x24
8003fde: f020 6070 bic.w r0, r0, #251658240 ; 0xf000000
8003fe2: 6258 str r0, [r3, #36] ; 0x24
8003fe4: 6a58 ldr r0, [r3, #36] ; 0x24
8003fe6: f040 7080 orr.w r0, r0, #16777216 ; 0x1000000
8003fea: 6258 str r0, [r3, #36] ; 0x24
8003fec: 6a58 ldr r0, [r3, #36] ; 0x24
8003fee: f040 6080 orr.w r0, r0, #67108864 ; 0x4000000
8003ff2: 6258 str r0, [r3, #36] ; 0x24
8003ff4: 6b08 ldr r0, [r1, #48] ; 0x30
8003ff6: f040 0002 orr.w r0, r0, #2
8003ffa: 6308 str r0, [r1, #48] ; 0x30
8003ffc: 6818 ldr r0, [r3, #0]
8003ffe: f020 4040 bic.w r0, r0, #3221225472 ; 0xc0000000
8004002: 6018 str r0, [r3, #0]
8004004: 6818 ldr r0, [r3, #0]
8004006: f040 4000 orr.w r0, r0, #2147483648 ; 0x80000000
800400a: 6018 str r0, [r3, #0]
800400c: 6898 ldr r0, [r3, #8]
800400e: f020 4040 bic.w r0, r0, #3221225472 ; 0xc0000000
8004012: 6098 str r0, [r3, #8]
8004014: 6898 ldr r0, [r3, #8]
8004016: f040 4080 orr.w r0, r0, #1073741824 ; 0x40000000
800401a: 6098 str r0, [r3, #8]
800401c: 6898 ldr r0, [r3, #8]
800401e: f040 4000 orr.w r0, r0, #2147483648 ; 0x80000000
8004022: 6098 str r0, [r3, #8]
8004024: 6a58 ldr r0, [r3, #36] ; 0x24
8004026: f020 4070 bic.w r0, r0, #4026531840 ; 0xf0000000
800402a: 6258 str r0, [r3, #36] ; 0x24
800402c: 6a58 ldr r0, [r3, #36] ; 0x24
800402e: f040 5080 orr.w r0, r0, #268435456 ; 0x10000000
8004032: 6258 str r0, [r3, #36] ; 0x24
8004034: 6a58 ldr r0, [r3, #36] ; 0x24
8004036: f040 4080 orr.w r0, r0, #1073741824 ; 0x40000000
800403a: 6258 str r0, [r3, #36] ; 0x24
800403c: 6c0b ldr r3, [r1, #64] ; 0x40
800403e: 4820 ldr r0, [pc, #128] ; (80040c0 <bsp_initSPIADIS+0x174>)
8004040: f443 4380 orr.w r3, r3, #16384 ; 0x4000
8004044: 640b str r3, [r1, #64] ; 0x40
8004046: 61e5 str r5, [r4, #28]
8004048: 6026 str r6, [r4, #0]
800404a: 6823 ldr r3, [r4, #0]
800404c: 4e1d ldr r6, [pc, #116] ; (80040c4 <bsp_initSPIADIS+0x178>)
800404e: f023 0338 bic.w r3, r3, #56 ; 0x38
8004052: 6023 str r3, [r4, #0]
8004054: 6823 ldr r3, [r4, #0]
8004056: f043 0338 orr.w r3, r3, #56 ; 0x38
800405a: 6023 str r3, [r4, #0]
800405c: f8c4 e004 str.w lr, [r4, #4]
8004060: 6b0b ldr r3, [r1, #48] ; 0x30
8004062: 4c19 ldr r4, [pc, #100] ; (80040c8 <bsp_initSPIADIS+0x17c>)
8004064: f443 1300 orr.w r3, r3, #2097152 ; 0x200000
8004068: 630b str r3, [r1, #48] ; 0x30
800406a: 603a str r2, [r7, #0]
800406c: 6839 ldr r1, [r7, #0]
800406e: f000 faab bl 80045c8 <printf>
8004072: 4b16 ldr r3, [pc, #88] ; (80040cc <bsp_initSPIADIS+0x180>)
8004074: 4629 mov r1, r5
8004076: 2203 movs r2, #3
8004078: 601c str r4, [r3, #0]
800407a: 2001 movs r0, #1
800407c: f7fe f90e bl 800229c <xQueueGenericCreate>
8004080: 4629 mov r1, r5
8004082: 6170 str r0, [r6, #20]
8004084: 2203 movs r2, #3
8004086: 2001 movs r0, #1
8004088: f44f 4480 mov.w r4, #16384 ; 0x4000
800408c: f7fe f906 bl 800229c <xQueueGenericCreate>
8004090: 4b0f ldr r3, [pc, #60] ; (80040d0 <bsp_initSPIADIS+0x184>)
8004092: 2240 movs r2, #64 ; 0x40
8004094: f44f 4100 mov.w r1, #32768 ; 0x8000
8004098: 6130 str r0, [r6, #16]
800409a: 601c str r4, [r3, #0]
800409c: 6019 str r1, [r3, #0]
800409e: f883 230e strb.w r2, [r3, #782] ; 0x30e
80040a2: f883 230f strb.w r2, [r3, #783] ; 0x30f
80040a6: bdf8 pop {r3, r4, r5, r6, r7, pc}
80040a8: 40023800 andmi r3, r2, r0, lsl #16
80040ac: 40022000 andmi r2, r2, r0
80040b0: 40020400 andmi r0, r2, r0, lsl #8
80040b4: 40003800 andmi r3, r0, r0, lsl #16
80040b8: 40026058 andmi r6, r2, r8, asr r0
80040bc: 00030416 andeq r0, r3, r6, lsl r4
80040c0: 08008ec8 stmdaeq r0, {r3, r6, r7, r9, sl, fp, pc}
80040c4: 2000c2d0 ldrdcs ip, [r0], -r0
80040c8: 00030456 andeq r0, r3, r6, asr r4
80040cc: 40026070 andmi r6, r2, r0, ror r0
80040d0: e000e100 and lr, r0, r0, lsl #2
08003f4c:
8003f4c:4956 ldr r1，[pc，#344]；（80040a8）
8003f4e:4a57 ldr r2，[pc，#348]；（80040ac）
8003f50:6b08 ldr r0，[r1，#48]；0x30
8003f52:F4407080 orr.w r0，r0，#256；0x100
8003f56:b5f8推送{r3，r4，r5，r6，r7，lr}
8003f58:6308 str r0，[r1，#48]；0x30
8003f5a:2500毫伏r5，#0
8003f5c:6810 ldr r0[r2，#0]
8003f5e:f240 3607 movw r6，#775；0x307
8003f62:4b53 ldr r3，[pc，#332]；（80040b0）
8003f64:F44F5EB8移动带lr，#5888；0x1700
8003f68:F020000立方英尺宽r0，r0，#12
8003f6c:4c51 ldr r4，[pc，#324]；（80040b4）
8003f6e:4f52 ldr r7，[pc，#328]；（80040b8）
8003f70:6010 str r0[r2，#0]
8003f72:6810 ldr r0[r2，#0]
8003f74:F040008 orr.w r0，r0，#8
8003f78:6010 str r0[r2，#0]
8003f7a:6890 ldr r0，[r2，#8]
8003f7c:F020000立方英尺宽r0，r0，#12
8003f80:6090 str r0[r2，#8]
8003f82:6890 ldr r0[r2，#8]
8003f84:F0400004 orr.w r0，r0，#4
8003f88:6090STRR0[r2，#8]
8003f8a:6890 ldr r0[r2，#8]
8003f8c:F0400008或w r0，r0，#8
8003f90:6090 str r0[r2，#8]
8003f92:6a10 ldr r0[r2，#32]
8003f94:f020 00f0 bic.w r0，r0，#240；0xf0
8003f98:6210 str r0[r2，#32]
8003f9a:6a10 ldr r0[r2，#32]
8003f9c:f040 0010或w r0，r0，#16
8003fa0:6210 str r0[r2，#32]
8003fa2:6a10 ldr r0[r2，#32]
8003fa4:f040 0040或w r0，r0，#64；0x40
8003fa8:6210 str r0[r2，#32]
8003faa:6b08 ldr r0，[r1，#48]；0x30
8003fac:4a43 ldr r2，[pc，#268]；（公元前80040年）
8003fae:F040002 orr.w r0，r0，#2
8003fb2:6308 str r0，[r1，#48]；0x30
8003fb4:6818 ldr r0[r3，#0]
8003fb6:f020 5040 bic.w r0，r0，#805306368；0x30000000
8003fba:6018 str r0[r3，#0]
8003fbc:6818 ldr r0，[r3，#0]
8003fbe:f040 5000 orr.w r0，r0，#536870912；0x20000000
8003fc2:6018 str r0[r3，#0]
8003fc4:6898 ldr r0，[r3，#8]
8003fc6:f020 5040 bic.w r0，r0，#805306368；0x30000000
8003fca:6098 str r0[r3，#8]
8003fcc:6898 ldr r0[r3，#8]
8003fce:f040 5080或w r0，r0，#268435456；0x10000000
8003fd2:6098 str r0[r3，#8]
8003fd4:6898 ldr r0，[r3，#8]
8003fd6:f040 5000欧，宽r0，r0，#536870912；0x20000000
8003fda:6098 str r0[r3，#8]
8003fdc:6a58 ldr r0，[r3，#36]；0x24
8003fde:F0206070 bic.w r0，r0，#25168240；0xf000000
8003fe2:6258 str r0，[r3，#36]；0x24
8003fe4:6a58 ldr r0，[r3，#36]；0x24
8003fe6:F0407080或w r0，r0，#16777216；0x1000000
8003fea:6258 str r0，[r3，#36]；0x24
8003fec:6a58 ldr r0，[r3，#36]；0x24
8003费用：F0406080或w r0，r0，#67108864；0x4000000
8003ff2:6258 str r0[r3，#36]；0x24
8003ff4:6b08 ldr r0，[r1，#48]；0x30
8003ff6:F040002 orr.w r0，r0，#2
8003ffa:6308 str r0，[r1，#48]；0x30
8003ffc:6818 ldr r0[r3，#0]
8003ffe:f020 4040 bic.w r0，r0，#322225472；0xc0000000
8004002:6018 str r0[r3，#0]
8004004:6818 ldr r0[r3，#0]
8004006:f040 4000 orr.w r0，r0，#2147483648；0x80000000
80040