How is it different from VFMV.S.F?
VFMV.S.F writes only element 0; VFMV.V.F broadcasts the scalar to active elements.
VFMV.V.F
RISC-V VFMV.V.F Instruction Details
Instruction ManualR-typeCopy scalar f register rs1 to all active elements of vd (VL elements); tail follows policy.
Instruction Syntax
vfmv.v.f vd, rs1
Operand Breakdown
Destination rd: register receiving the operation result.
Source rs1: register holding the first operand.
Source rs2: register holding the second operand.
VZvfhVector OperationsRegister Move
Related Search Terms
Instruction Behavior
VFMV.V.F broadcasts floating-point scalar f[rs1] to active elements of vd; it is the unmasked FP scalar splat form.
Quick Understanding & Search Notes
VFMV.V.F is FP scalar broadcast, writing f[rs1] to the current active elements.
The scalar value is written only to active elements within vl; inactive and tail elements follow the current policies.
VFMV.V.F is encoded as the unmasked scalar splat form, has no execution-mask operand, and does not use v0 for selection.
Common Usage Scenarios
Vector Init
Understand this scenario with real code like «vsetvli t0, a0, e32, m1, ta, ma vfmv.v.f v1, ft0 # v1[0..VL-1] = ft0».
Constant Broadcast
Understand this scenario with real code like «vsetvli t0, a0, e32, m1, ta, ma vfmv.v.f v1, ft0 # v1[0..VL-1] = ft0».
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
This broadcasts to active elements; it is not an element-0-only move.
Inactive and tail elements still follow the current policies.