From 4416e885d28c0f49d2c7bb3f9630ab23c22fbc9a Mon Sep 17 00:00:00 2001
From: Mike Pall <mike>
Date: Mon, 20 Feb 2017 02:51:31 +0100
Subject: Fix FOLD rules for math.abs() and FP negation.

Broken since SIMD constants were switched to IR_FLOAD REF_NIL.
---
 src/lj_opt_fold.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/src/lj_opt_fold.c b/src/lj_opt_fold.c
index 11f670b2..408811f2 100644
--- a/src/lj_opt_fold.c
+++ b/src/lj_opt_fold.c
@@ -173,8 +173,6 @@ LJFOLD(ADD KNUM KNUM)
 LJFOLD(SUB KNUM KNUM)
 LJFOLD(MUL KNUM KNUM)
 LJFOLD(DIV KNUM KNUM)
-LJFOLD(NEG KNUM KNUM)
-LJFOLD(ABS KNUM KNUM)
 LJFOLD(ATAN2 KNUM KNUM)
 LJFOLD(LDEXP KNUM KNUM)
 LJFOLD(MIN KNUM KNUM)
@@ -187,6 +185,15 @@ LJFOLDF(kfold_numarith)
   return lj_ir_knum(J, y);
 }
 
+LJFOLD(NEG KNUM FLOAD)
+LJFOLD(ABS KNUM FLOAD)
+LJFOLDF(kfold_numabsneg)
+{
+  lua_Number a = knumleft;
+  lua_Number y = lj_vm_foldarith(a, a, fins->o - IR_ADD);
+  return lj_ir_knum(J, y);
+}
+
 LJFOLD(LDEXP KNUM KINT)
 LJFOLDF(kfold_ldexp)
 {
@@ -916,13 +923,13 @@ LJFOLDF(shortcut_round)
   return NEXTFOLD;
 }
 
-LJFOLD(ABS ABS KNUM)
+LJFOLD(ABS ABS FLOAD)
 LJFOLDF(shortcut_left)
 {
   return LEFTFOLD;  /* f(g(x)) ==> g(x) */
 }
 
-LJFOLD(ABS NEG KNUM)
+LJFOLD(ABS NEG FLOAD)
 LJFOLDF(shortcut_dropleft)
 {
   PHIBARRIER(fleft);
-- 
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