T4 y 48 int t5 t3 t4 int rval t2 t5 return rval movl

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Unformatted text preview: 3.5.5 for more instrucMons: mull, cltd, idivl, divl   x86 University of Washington Using leal for ArithmeMc Expressions int arith (int x, int y, int z) { int t1 = x+y; int t2 = z+t1; int t3 = x+4; int t4 = y * 48; int t5 = t3 + t4; int rval = t2 * t5; return rval; } arith: pushl %ebp movl %esp,%ebp movl 8(%ebp),%eax movl 12(%ebp),%edx leal (%edx,%eax),%ecx leal (%edx,%edx,2),%edx sall $4,%edx addl 16(%ebp),%ecx leal 4(%edx,%eax),%eax imull %ecx,%eax movl %ebp,%esp popl %ebp ret x86 Set Up Body Finish University of Washington Understanding arith int arith (int x, int y, int z) { int t1 = x+y; int t2 = z+t1; int t3 = x+4; int t4 = y * 48; int t5 = t3 + t4; int rval = t2 * t5; return rval; } movl 8(%ebp),%eax movl 12(%ebp),%edx leal (%edx,%eax),%ecx leal (%edx,%edx,2),%edx sall $4,%edx addl 16(%ebp),%ecx leal 4(%edx,%eax),%eax imull %ecx,%eax Offset • • • 16 z 12 y 8 x 4 Rtn adr 0 Old %ebp # # # # # # # # eax edx ecx edx edx ecx eax eax x86 = = = = = = = = x y x+y (t1) y + 2*y = 3*y 48*y (t4) z+t1 (t2) 4+t4+x (t5) t5*t2 (rval) Stack %ebp University of Washington Understanding arith int arith (int x, int y, int z) { int t1 = x+y; int t2 = z+t1; int t3 = x+4; int t4 = y * 48; int t5 = t3 + t4; int rval = t2 * t5; return rval; } movl 8(%ebp),%eax movl 12(%ebp),%edx leal (%edx,%eax),%ecx leal (%edx,%edx,2),%edx sall $4,%edx addl 16(%ebp),%ecx leal 4(%edx,%eax),%eax imull %ecx,%eax Offset • • • 16 z 12 y 8 x 4 Rtn adr 0 Old %ebp # # # # # # # # eax edx ecx edx edx ecx eax eax x86 = = = = = = = = x y x+y (t1) y + 2*y = 3*y 48*y (t4) z+t1 (t2) 4+t4+x (t5) t5*t2 (rval) Stack %ebp University of Washington Understanding arith int arith (int x, int y, int z) { int t1 = x+y; int t2 = z+t1; int t3 = x+4; int t4 = y * 48; int t5 = t3 + t4; int rval = t2 * t5; return rval; } movl 8(%ebp),%eax movl 12(%ebp),%edx leal (%edx,%eax),%ecx leal (%edx,%edx,2),%edx sall $4,%edx addl 16(%ebp),%ecx leal 4(%edx,%eax),%eax imull %ecx,%eax Offset • • • 16 z 12 y 8 x 4 Rtn adr 0 Old %ebp # # # # # # # # eax edx ecx edx edx ecx eax eax x86 = = = = = = = = x y x+y (t1) y + 2*y = 3*y 48*y (t4) z+t1 (t2) 4+t4+x (t5) t5*t2 (rval) Stack %ebp University of Washington Understanding arith int arith (int x, int y, int z) { int t1 = x+y; int t2 = z+t1; int t3 = x+4; int t4 = y * 48; int t5 = t3 + t4; int rval = t2 * t5; return rval; } movl 8(%ebp),%eax movl 12(%ebp),%edx leal (%edx,%eax),%e...
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