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fnstsw
sahf instruction
x86 floating point instructions
fpu status word
22 Aug 2016 FCOMP Compares the fpu register ST0 with a constant the constant is a QWORD (Meaning DOUBLE , FLOAT , Etc 8+ bytes wide ). ollydbg can show both the ST0 register and decipher the contents of the CONSTANT . in your case if shows DB 00 because the constant is probably 0.0 . and you have not set
Documentation Home > IA-32 Assembly Language Reference Manual > Chapter 2 Instruction-Set Mapping > Comparison Instructions > Compare Real and Pop (fcomp). IA-32 Assembly Language Reference Manual. Previous: Compare Real (fcom) · Next: Compare Real and Pop Twice (fcompp)
background image. FCOM/FCOMP/FCOMPP—Compare Floating Point Values. INSTRUCTION SET REFERENCE, A-L. 3-324 Vol. 2A. FCOM/FCOMP/FCOMPP—Compare Floating Point Values. Description. Compares the contents of register ST(0) and source value and sets condition code flags C0, C2, and C3 in the FPU
Opcode, Mnemonic, Description. D8 /2, FCOM m32fp, Compare ST(0) with m32fp. DC /2, FCOM m64fp, Compare ST(0) with m64fp. D8 D0+i, FCOM ST(i), Compare ST(0) with ST(i). D8 D1, FCOM, Compare ST(0) with ST(1). D8 /3, FCOMP m32fp, Compare ST(0) with m32fp and pop register stack. DC /3, FCOMP m64fp
Opcode. Instruction. Description. D8 /2. FCOM m32real. Compare ST(0) with m32real. DC /2. FCOM m64real. Compare ST(0) with m64real. D8 D0+i. FCOM ST(i). Compare ST(0) with ST(i). D8 D1. FCOM. Compare ST(0) with ST(1). D8 /3. FCOMP m32real. Compare ST(0) with m32real and pop register stack. DC /3. FCOMP
An example of using the FCOMP instruction would be when a temporary value has been stored as a REAL10 for later use in comparisons. Memory values in that format are not available for direct comparison like the REAL4 and REAL8 values and must be loaded to the FPU. If a comparison between that temporary value
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