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 b8bdd7f423875aaa709cc1a62b5b7ad2c7e36efb..5dc8794145bc57c7c8c0bd5812c5cbe2e8b903ec 100644 (file)
--- 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") }