Compute compare compute ab t1 ba t2 ca t3 compare ac

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Unformatted text preview: omitted. Parameters x and n are stored at memory locations with offsets 8 and 12, respectively, relative to the address in register %ebp. 1 2 3 4 movl 12(%ebp),%ecx movl 8(%ebp),%eax _____________ _____________ Get x Get n x <<= 2 x >>= n Fill in the missing instructions, following the annotations on the right. The right shift should be performed arithmetically. 108 CHAPTER 3. MACHINE-LEVEL REPRESENTATION OF C PROGRAMS code/asm/arith.c 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 9 10 11 int arith(int x, int y, int z) { int t1 = x+y; int t2 = z*48; int t3 = t1 & 0xFFFF; int t4 = t2 * t3; return t4; } code/asm/arith.c movl 12(%ebp),%eax movl 16(%ebp),%edx addl 8(%ebp),%eax leal (%edx,%edx,2),%edx sall $4,%edx andl $65535,%eax imull %eax,%edx movl %edx,%eax Get y Get z Compute t1 = x+y Compute z*3 Compute t2 = z*48 Compute t3 = t1&0xFFFF Compute t4 = t2*t3 Set t4 as return val (a) C code (b) Assembly code Figure 3.7: C and Assembly Code for Arithmetic Routine Body. The stack set-up and completion portions have been omitted. 3.5.4 Dis...
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This note was uploaded on 09/02/2010 for the course ELECTRICAL 360 taught by Professor Schultz during the Spring '10 term at BYU.

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