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| author | Björn-Egil Dahlberg <[email protected]> | 2015-04-23 15:34:07 +0200 |
|---|---|---|
| committer | Björn-Egil Dahlberg <[email protected]> | 2015-04-23 15:34:07 +0200 |
| commit | 06a912c068f62e1e04ebb2aa2002d611b8cc31e3 (patch) | |
| tree | 5059ab538a572b73282ee7d20636023b051cf8f2 /erts/emulator/beam/beam_load.c | |
| parent | d1321eaf9bd1e417561e3d70fd85749fe589143b (diff) | |
| download | otp-06a912c068f62e1e04ebb2aa2002d611b8cc31e3.tar.gz otp-06a912c068f62e1e04ebb2aa2002d611b8cc31e3.tar.bz2 otp-06a912c068f62e1e04ebb2aa2002d611b8cc31e3.zip | |
erts: Fix loader increment from minus instruction
A type error caused the optimization to never kick in.
Diffstat (limited to 'erts/emulator/beam/beam_load.c')
| -rw-r--r-- | erts/emulator/beam/beam_load.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/erts/emulator/beam/beam_load.c b/erts/emulator/beam/beam_load.c index 8d7beb4eb4..282aa71109 100644 --- a/erts/emulator/beam/beam_load.c +++ b/erts/emulator/beam/beam_load.c @@ -3172,7 +3172,11 @@ gen_increment_from_minus(LoaderState* stp, GenOpArg Reg, GenOpArg Integer, static int negation_is_small(LoaderState* stp, GenOpArg Int) { - return Int.type == TAG_i && IS_SSMALL(-Int.val); + /* Check for the rare case of overflow in BeamInstr (UWord) -> Sint + * Cast to the correct type before using IS_SSMALL (Sint) */ + return Int.type == TAG_i && + !(Int.val & ~((((BeamInstr)1) << ((sizeof(Sint)*8)-1))-1)) && + IS_SSMALL(-((Sint)Int.val)); } |