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| author | Edmund Grimley Evans <Edmund.Grimley.Evans@gmail.com> | 2015-03-02 20:51:03 +0000 |
|---|---|---|
| committer | Edmund Grimley Evans <Edmund.Grimley.Evans@gmail.com> | 2015-03-02 20:51:03 +0000 |
| commit | 1706d2254b168309b2c38985750b6d00ad254ef3 (patch) | |
| tree | 15e7158c19bb59986e89442018f5f96d0e71b340 /arm64-gen.c | |
| parent | 1d41da959006cf9695c505a5bd6a6e4c08bfd9f4 (diff) | |
| download | tinycc-1706d2254b168309b2c38985750b6d00ad254ef3.tar.gz tinycc-1706d2254b168309b2c38985750b6d00ad254ef3.tar.bz2 | |
arm64-gen.c: Improve generation of stack offsets.
Diffstat (limited to 'arm64-gen.c')
| -rw-r--r-- | arm64-gen.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/arm64-gen.c b/arm64-gen.c index 630556d..5444f29 100644 --- a/arm64-gen.c +++ b/arm64-gen.c @@ -274,8 +274,16 @@ static int arm64_type_size(int t) static void arm64_spoff(int reg, uint64_t off) { - arm64_movimm(30, off); // use x30 for offset - o(0x8b3e63e0 | reg); // add x(reg),sp,x30 + uint32_t sub = off >> 63; + if (sub) + off = -off; + if (off < 4096) + o(0x910003e0 | sub << 30 | reg | off << 10); + // (add|sub) x(reg),sp,#(off) + else { + arm64_movimm(30, off); // use x30 for offset + o(0x8b3e63e0 | sub << 30 | reg); // (add|sub) x(reg),sp,x30 + } } static void arm64_ldrx(int sg, int sz, int dst, int bas, uint64_t off) |