Created
February 17, 2011 14:05
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The generated asm for float f = 0; while (f != f + 1) { f += 1; }
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| ; | |
| ; cl.exe /Od (no optimization) | |
| ; | |
| ; float f = 0; | |
| fldz | |
| fstp DWORD PTR _f$[ebp] | |
| $LN2@wmain: | |
| ; while (f != f + 1) { | |
| fld DWORD PTR _f$[ebp] | |
| fadd QWORD PTR __real@3ff0000000000000 | |
| fld DWORD PTR _f$[ebp] | |
| fucompp | |
| fnstsw ax | |
| test ah, 68 ; 00000044H | |
| jnp SHORT $LN1@wmain | |
| ; f += 1; | |
| fld DWORD PTR _f$[ebp] | |
| fadd QWORD PTR __real@3ff0000000000000 | |
| fstp DWORD PTR _f$[ebp] | |
| ; } | |
| jmp SHORT $LN2@wmain | |
| $LN1@wmain: | |
| ; | |
| ; cl.exe /Ox (maximum optimization) | |
| ; | |
| ; float f = 0; | |
| fldz | |
| fstp DWORD PTR _f$[esp+4] | |
| ; while (f != f + 1) { | |
| fldz | |
| fld ST(0) | |
| fld1 | |
| fadd ST(1), ST(0) | |
| fld ST(1) | |
| fucomp ST(3) | |
| fnstsw ax | |
| fstp ST(2) | |
| test ah, 68 ; 00000044H | |
| jnp SHORT $LN9@wmain | |
| $LN2@wmain: | |
| ; f += 1; | |
| fstp DWORD PTR _f$[esp+4] | |
| fld DWORD PTR _f$[esp+4] | |
| fld ST(0) | |
| fadd ST(0), ST(2) | |
| fld ST(0) | |
| fucomp ST(2) | |
| fnstsw ax | |
| fstp ST(1) | |
| test ah, 68 ; 00000044H | |
| jp SHORT $LN2@wmain | |
| $LN9@wmain: | |
| ; while (f != f + 1) { | |
| fstp ST(0) |
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