On Wed, 18 Oct 2017, Janne Grunau wrote:
On 2017-10-16 22:38:17 +0300, Martin Storsjö wrote:
---
gas-preprocessor.pl | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/gas-preprocessor.pl b/gas-preprocessor.pl
index 552ed0c..b650c39 100755
--- a/gas-preprocessor.pl
+++ b/gas-preprocessor.pl
@@ -1012,6 +1012,19 @@ sub handle_serialized_line {
# variant/combination of prfum tested so far, but it can be
# left out without any
$line =~ s/prfum.*\]//;
+
+ # Convert "ldrb w0, [x0, #-1]" into "ldurb w0, [x0, #-1]".
+ # Don't do this for forms with writeback though.
+ if ($line =~
/(ld|st)(r[bh]?)\s+(\w+)\s*,\s*\[\s*(\w+)\s*,\s*#([^\]]+)\s*\][^!]/) {
+ my $instr = $1;
+ my $suffix = $2;
+ my $target = $3;
+ my $base = $4;
+ my $offset = eval_expr($5);
+ if ($offset < 0) {
+ $line =~ s/$instr$suffix/${instr}u$suffix/;
+ }
+ }
}
# armasm is unable to parse &0x - add spacing
$line =~ s/&0x/& 0x/g;
patch ok-ish but we should fix the offending code too. ldr? without
writeback supports only unsigned offsets and gas seems to fix it for us.
Ok, patch sent to x264.
// Martin
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