From a527a6d25adc6fbf2f3379f8edd5a6aaa3a84b63 Mon Sep 17 00:00:00 2001
From: Amanieu d'Antras <amanieu@gmail.com>
Date: Mon, 1 Nov 2021 00:08:18 +0000
Subject: [PATCH] Remove unused clobbers vector

---
 src/ion/data_structures.rs | 1 -
 src/ion/liveranges.rs      | 5 -----
 src/ion/mod.rs             | 1 -
 3 files changed, 7 deletions(-)

diff --git a/src/ion/data_structures.rs b/src/ion/data_structures.rs
index dbf1d77..2c8e616 100644
--- a/src/ion/data_structures.rs
+++ b/src/ion/data_structures.rs
@@ -293,7 +293,6 @@ pub struct Env<'a, F: Function> {
     pub vreg_regs: Vec<VReg>,
     pub pregs: Vec<PRegData>,
     pub allocation_queue: PrioQueue,
-    pub clobbers: Vec<Inst>,   // Sorted list of insts with clobbers.
     pub safepoints: Vec<Inst>, // Sorted list of safepoint insts.
     pub safepoints_per_vreg: HashMap<usize, HashSet<Inst>>,
 
diff --git a/src/ion/liveranges.rs b/src/ion/liveranges.rs
index 4c9e949..2aa078d 100644
--- a/src/ion/liveranges.rs
+++ b/src/ion/liveranges.rs
@@ -448,10 +448,6 @@ impl<'a, F: Function> Env<'a, F> {
             // For each instruction, in reverse order, process
             // operands and clobbers.
             for inst in insns.rev().iter() {
-                if self.func.inst_clobbers(inst).len() > 0 {
-                    self.clobbers.push(inst);
-                }
-
                 // Mark clobbers with CodeRanges on PRegs.
                 for i in 0..self.func.inst_clobbers(inst).len() {
                     // don't borrow `self`
@@ -1234,7 +1230,6 @@ impl<'a, F: Function> Env<'a, F> {
             }
         }
 
-        self.clobbers.sort_unstable();
         self.blockparam_ins.sort_unstable();
         self.blockparam_outs.sort_unstable();
         self.prog_move_srcs.sort_unstable_by_key(|(pos, _)| *pos);
diff --git a/src/ion/mod.rs b/src/ion/mod.rs
index e2d73b5..8d902c8 100644
--- a/src/ion/mod.rs
+++ b/src/ion/mod.rs
@@ -62,7 +62,6 @@ impl<'a, F: Function> Env<'a, F> {
             vreg_regs: Vec::with_capacity(n),
             pregs: vec![],
             allocation_queue: PrioQueue::new(),
-            clobbers: vec![],
             safepoints: vec![],
             safepoints_per_vreg: HashMap::new(),
             spilled_bundles: vec![],