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Fix AArch64 MOVI2R helper function. 

In the case of a zero immediate, it wouldn't generate code at all.
Also in the case of max u32/u64, use ORN to optimize it.
This commit is contained in:
Ryan Houdek 2014-09-12 05:45:10 -05:00
parent 64b21a4812
commit 17d31ecd6c
1 changed files with 19 additions and 0 deletions
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19
Source/Core/Common/Arm64Emitter.cpp
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@ -2,6 +2,8 @@
// Licensed under GPLv2
// Refer to the license.txt file included.
#include <limits>
#include "Arm64Emitter.h"
namespace Arm64Gen
@ -1341,6 +1343,23 @@ void ARM64XEmitter::MOVI2R(ARM64Reg Rd, u64 imm, bool optimize)
if (!Is64Bit(Rd))
_assert_msg_(DYNA_REC, !(imm >> 32), "%s: immediate doesn't fit in 32bit register: %lx", __FUNCTION__, imm);
if (!imm)
{
// Zero immediate, just clear the register
EOR(Rd, Rd, Rd, ArithOption(Rd, ST_LSL, 0));
return;
}
if ((Is64Bit(Rd) && imm == std::numeric_limits<u64>::max()) ||
(!Is64Bit(Rd) && imm == std::numeric_limits<u32>::max()))
{
// Max unsigned value
// Set to ~ZR
ARM64Reg ZR = Is64Bit(Rd) ? SP : WSP;
ORN(Rd, Rd, ZR, ArithOption(ZR, ST_LSL, 0));
return;
}
// XXX: Optimize more
// XXX: Support rotating immediates to save instructions
if (optimize)