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author AJR <ajrhacker@users.noreply.github.com>2022-09-25 22:28:50 -0400
committer AJR <ajrhacker@users.noreply.github.com>2022-09-25 22:37:29 -0400
commit5dc22ca8fd325315c5d24b6ed6a037cc38e86527 (patch)
tree3b0810f803ef2e9dff52c203510825f7c0b79a9b /src/devices/cpu/m88000/m88000.cpp
parenta61cb4cb61c544241712dfb039817e7c7b72e3c0 (diff)
eminline.h: Additions
- Add mul_16x16 inline function to perform a signed 16x16-bit multiplication with 32-bit result. This was moved from cpu/e132xs to unite it with the analogous 32x32 operations. - Add rotl_32, rotr_32, rotl_64 and rotr_64 inline functions to perform 32-bit and 64-bit circular shifts in either direction by the specified number of places, modulo 32 or 64. It is anticipated that these will eventually be replaced by standard functions in C++20's <bit> header, and so they have been given similar signatures and semantics (which are also validity-checked). - Remove LSL, LSR, ROL and ROR macros from cpu/arm and cpu/arm7 to ameliorate unnecessary obfuscation.
Diffstat (limited to 'src/devices/cpu/m88000/m88000.cpp')
-rw-r--r--src/devices/cpu/m88000/m88000.cpp8
1 files changed, 2 insertions, 6 deletions
diff --git a/src/devices/cpu/m88000/m88000.cpp b/src/devices/cpu/m88000/m88000.cpp
index 57cdfa6fbb2..f3921bc8667 100644
--- a/src/devices/cpu/m88000/m88000.cpp
+++ b/src/devices/cpu/m88000/m88000.cpp
@@ -615,7 +615,7 @@ void mc88100_device::execute(u32 const inst)
{
unsigned const offset = inst & 31;
- m_r[D] = (m_r[S1] << (32 - offset)) | (m_r[S1] >> offset);
+ m_r[D] = rotr_32(m_r[S1], offset);
}
break;
@@ -988,11 +988,7 @@ void mc88100_device::execute(u32 const inst)
}
break;
case 0x540: // rot: rotate (register)
- {
- unsigned const offset = m_r[S2] & 31;
-
- m_r[D] = (m_r[S1] << (32 - offset)) | (m_r[S1] >> offset);
- }
+ m_r[D] = rotr_32(m_r[S1], m_r[S2]);
break;
case 0x740: // ff1: find first bit set
{