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Register Guide

RISC-V ft1 / f1 Register: Floating temporary register

f1/ft1 is a floating-point register used by F/D/Q/Zfh instructions for operands and results.

ABI name: ft1; physical register: f1.
Save rule: Caller.
Read it through its psABI role first, then inspect how each instruction reads or writes it.
Physical Name f1ABI Name ft1Save Rule Caller
Role
Floating temporary register
Convention
Caller-saved
Remember This First
The calling convention listed for this entry is: Caller-saved.
psABI Floating-Point Register Reference

ABI register

f1/ft1 is a floating-point register used by F/D/Q/Zfh instructions for operands and results.

Preserved across calls: Caller
RISC-V psABI floating-point register convention

When It Fits Best

  • - Use it according to the documented role: Floating temporary register.
  • - Consult the applicable ISA or ABI specification for concrete read, write, or execution semantics.

When Not To Use It This Way

  • - Do not apply the integer temporary-register t* rules to this entry.
  • - Do not infer behavior not defined by this page or the applicable specification from the ABI name.

What Happens Around A Call

1

The calling convention listed for this entry is: Caller-saved.

2

The save rule listed for this entry is: Caller.

Read The Documented Role

Examples explain the rule, not a complete program
# f1 / ft1
# Floating temporary register
# Caller-saved