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JitArm64: MultiplyImmediate - Add comments

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This commit is contained in:
Bram Speeckaert 2022-11-01 21:17:49 +01:00
parent c349875cdc
commit 20dd5cadab
1 changed files with 4 additions and 0 deletions
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4
Source/Core/Core/PowerPC/JitArm64/JitArm64_Integer.cpp
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@ -881,12 +881,14 @@ bool JitArm64::MultiplyImmediate(u32 imm, int a, int d, bool rc)
{ {
if (imm == 0) if (imm == 0)
{ {
// Multiplication by zero (0).
gpr.SetImmediate(d, 0); gpr.SetImmediate(d, 0);
if (rc) if (rc)
ComputeRC0(gpr.GetImm(d)); ComputeRC0(gpr.GetImm(d));
} }
else if (imm == 1) else if (imm == 1)
{ {
// Multiplication by one (1).
if (d != a) if (d != a)
{ {
gpr.BindToRegister(d, false); gpr.BindToRegister(d, false);
@ -897,6 +899,7 @@ bool JitArm64::MultiplyImmediate(u32 imm, int a, int d, bool rc)
} }
else if (MathUtil::IsPow2(imm)) else if (MathUtil::IsPow2(imm))
{ {
// Multiplication by a power of two (2^n).
const int shift = IntLog2(imm); const int shift = IntLog2(imm);
gpr.BindToRegister(d, d == a); gpr.BindToRegister(d, d == a);
@ -906,6 +909,7 @@ bool JitArm64::MultiplyImmediate(u32 imm, int a, int d, bool rc)
} }
else if (MathUtil::IsPow2(imm - 1)) else if (MathUtil::IsPow2(imm - 1))
{ {
// Multiplication by a power of two plus one (2^n + 1).
const int shift = IntLog2(imm - 1); const int shift = IntLog2(imm - 1);
gpr.BindToRegister(d, d == a); gpr.BindToRegister(d, d == a);