Does it raise integer exceptions?
No. Floating-point exceptions are recorded in fflags and results follow the floating-point rules.
FSQRT.S
RISC-V FSQRT.S Instruction Details
Instruction ManualR-typeComputes single-precision FP square root: rd = sqrt(rs1).
Instruction Syntax
fsqrt.s rd, rs1, rm
Operand Breakdown
rd: destination floating-point register receiving the formatted result.
rs1/rs2: source floating-point registers; arithmetic/rounding forms with rm use rm or dynamic frm for rounding mode.
FFloating-Point Arithmetic
Instruction Behavior
FSQRT.S computes sqrt of single-precision value in rs1; result to rd. R-type. Negative input produces canonical NaN and sets NV flag.
Quick Understanding & Search Notes
FSQRT.S is a floating-point arithmetic instruction. It uses the rm field for rounding mode and sets fflags exception flags according to IEEE 754/RISC-V floating-point rules.
The .S suffix uses 32-bit single precision from the F extension.
Negative operands, NaNs, and exactness are handled by floating-point square-root rules and exception flags.
Common Usage Scenarios
Numerical Computing
Understand this scenario with real code like «fsqrt.s f0, f1 # f0 = sqrt(f1) (RNE)».
Type Conversion
Understand this scenario with real code like «fsqrt.s f0, f1 # f0 = sqrt(f1) (RNE)».
Pre-Use Checklist
Syntax Check
- Confirm the current instruction format is R-type.
- Confirm the operand order matches the example.
Semantic Check
- Ensure the destination register usage is compatible with the calling convention.
- Confirm this is not the lower-level form of a pseudo-instruction expansion.
Pitfalls / Common Confusions
negative input produces NaN
FAQ
Can rm be omitted?
Assemblers may provide a dynamic/default spelling, but the machine instruction contains a rounding-mode field.