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arm64-gen.c: Improve generation of stack offsets.

master
Edmund Grimley Evans 2015-03-02 20:51:03 +00:00
parent 1d41da9590
commit 1706d2254b
1 changed files with 10 additions and 2 deletions
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12
arm64-gen.c
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@ -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)