1 2 #include <stdio.h> 3 4 __attribute__((noinline)) float s_to_f32_imm1(int x) 5 { 6 float y; 7 __asm__ ("vcvt.f32.s32 %0, %1, #1" : "=w"(y) : "0"(x)); 8 return y; 9 } 10 11 __attribute__((noinline)) float s_to_f32_imm32(int x) 12 { 13 float y; 14 __asm__ ("vcvt.f32.s32 %0, %1, #32" : "=w"(y) : "0"(x)); 15 return y; 16 } 17 18 void try_s_to_f32 ( int x ) 19 { 20 float f32 = s_to_f32_imm32(x); 21 printf("s_to_f32_imm32: %11d -> %18.14e\n", x, (double)f32); 22 f32 = s_to_f32_imm1(x); 23 printf("s_to_f32_imm1: %11d -> %18.14e\n", x, (double)f32); 24 } 25 26 27 28 __attribute__((noinline)) float u_to_f32_imm1(int x) 29 { 30 float y; 31 __asm__ ("vcvt.f32.u32 %0, %1, #1" : "=w"(y) : "0"(x)); 32 return y; 33 } 34 35 __attribute__((noinline)) float u_to_f32_imm32(int x) 36 { 37 float y; 38 __asm__ ("vcvt.f32.u32 %0, %1, #32" : "=w"(y) : "0"(x)); 39 return y; 40 } 41 42 void try_u_to_f32 ( unsigned int x ) 43 { 44 float f32 = u_to_f32_imm32(x); 45 printf("u_to_f32_imm32: %11u -> %18.14e\n", x, (double)f32); 46 f32 = u_to_f32_imm1(x); 47 printf("u_to_f32_imm1: %11u -> %18.14e\n", x, (double)f32); 48 } 49 50 51 //__attribute__((noinline)) double s_to_f64_imm1(int x) 52 //{ 53 // double y; 54 // __asm__ ("vcvt.f64.s32 %P0, %1, #4" : "=w"(y) : "0"((long long)x)); 55 // return y; 56 //} 57 58 59 60 61 int main ( void ) 62 { 63 int i; 64 //float f = foo(1); 65 //__asm__ __volatile__("" : : "r"(f) : "cc","memory"); 66 try_s_to_f32(0); 67 try_s_to_f32(1); 68 for (i = 100; i < 200; i++) { 69 try_s_to_f32(i); 70 } 71 try_s_to_f32(0x7FFFFFFE); 72 try_s_to_f32(0x7FFFFFFF); 73 try_s_to_f32(0x80000000); 74 try_s_to_f32(0x80000001); 75 try_s_to_f32(0xFFFFFFFE); 76 try_s_to_f32(0xFFFFFFFF); 77 printf("\n"); 78 try_u_to_f32(0); 79 try_u_to_f32(1); 80 for (i = 100; i < 200; i++) { 81 try_u_to_f32(i); 82 } 83 try_u_to_f32(0x7FFFFFFE); 84 try_u_to_f32(0x7FFFFFFF); 85 try_u_to_f32(0x80000000); 86 try_u_to_f32(0x80000001); 87 try_u_to_f32(0xFFFFFFFE); 88 try_u_to_f32(0xFFFFFFFF); 89 return 0; 90 } 91
