From: Alex Dowad <alexinbeijing@gmail.com>
Date: Fri, 2 Oct 2015 11:32:33 +0000 (+0200)
Subject: fix instruction matching errors in i386 CFI generation
X-Git-Url: http://nsz.repo.hu/git/?a=commitdiff_plain;h=dc97951402b499023ce877dd2438bce0840b2c26;p=musl

fix instruction matching errors in i386 CFI generation

fdiv and fmul instructions were wrongly matched by the rules for
integer div and mul instructions, leading to incorrect conclusions
about register values being clobbered.
---

diff --git a/tools/add-cfi.i386.awk b/tools/add-cfi.i386.awk
index b8bdd7f4..5dc87941 100644
--- a/tools/add-cfi.i386.awk
+++ b/tools/add-cfi.i386.awk
@@ -188,9 +188,9 @@ function trashed(register) {
 /(add|addl|sub|subl|and|or|xor|lea|sal|sar|shl|shr) %e(ax|bx|cx|dx|si|di|bp),/ {
   trashed(get_reg1())
 }
-/i?mul [^,]*$/                    { trashed("eax"); trashed("edx") }
-/i?mul %e(ax|bx|cx|dx|si|di|bp),/ { trashed(get_reg1()) }
-/i?div/                           { trashed("eax"); trashed("edx") }
+/^i?mul [^,]*$/                    { trashed("eax"); trashed("edx") }
+/^i?mul %e(ax|bx|cx|dx|si|di|bp),/ { trashed(get_reg1()) }
+/^i?div/                           { trashed("eax"); trashed("edx") }
 /(dec|inc|not|neg|pop) %e(ax|bx|cx|dx|si|di|bp)/  { trashed(get_reg()) }
 /cpuid/ { trashed("eax"); trashed("ebx"); trashed("ecx"); trashed("edx") }