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ld.a %rd, [%sp]+
ld.a %rd, [%sp]-
ld.a %rd, -[%sp]
Function
32-bit data transfer with address increment/decrement option
ld.a %rd, [%sp]+ (with post-increment option)
Standard)
Extension 1) rd(23:0) ← A[sp](23:0), ignored ← A[sp](31:24), sp(23:0) ← sp(23:0) + imm13
Extension 2) rd(23:0) ← A[sp](23:0), ignored ← A[sp](31:24), sp(23:0) ← sp(23:0) + imm24
ld.a %rd, [%sp]- (with post-decrement option)
Standard)
Extension 1) rd(23:0) ← A[sp](23:0), ignored ← A[sp](31:24), sp(23:0) ← sp(23:0) - imm13
Extension 2) rd(23:0) ← A[sp](23:0), ignored ← A[sp](31:24), sp(23:0) ← sp(23:0) - imm24
ld.a %rd, -[%sp] (with pre-decrement option)
Standard)
Extension 1) sp(23:0) ← sp(23:0) - imm13, rd(23:0) ← A[sp](23:0), ignored ← A[sp](31:24)
Extension 2) sp(23:0) ← sp(23:0) - imm24, rd(23:0) ← A[sp](23:0), ignored ← A[sp](31:24)
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Code
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Mode
Src: Register indirect %sp
Dst: Register direct %rd = %r0 to %r7
CLK
Two cycles
Description
(1) Address increment/decrement option
Specifying the []+, []-, or -[] option will automatically increment/decrement the memory
address. This allows the program to simply perform continuous data transfer.
ld.a
ld.a
ld.a
The address increment/decrement sizes are listed below.
When no ext is used (standard):
When one ext is used (extension 1): imm13
When two ext are used (extension 2): imm24
S1C17 CORE MANUAL
(Rev. 1.2)
rd(23:0) ← A[sp](23:0), ignored ← A[sp](31:24), sp(23:0) ← sp(23:0) + 4
rd(23:0) ← A[sp](23:0), ignored ← A[sp](31:24), sp(23:0) ← sp(23:0) - 4
sp(23:0) ← sp(23:0) - 4, rd(23:0) ← A[sp](23:0), ignored ← A[sp](31:24)
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–
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Load instruction with post-increment option
%rd,[%sp]+
The memory address will be incremented after the data transfer has
finished.
Load instruction with post-decrement option
%rd,[%sp]-
The memory address will be decremented after the data transfer has
finished.
Load instruction with pre-decrement option
%rd,-[%sp]
The memory address will be decremented before starting the data
transfer.
Seiko Epson Corporation
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4 (32-bit size)
7 DETAILS OF INSTRUCTIONS
ld.a
%rd,[%sp]+
ld.a
%rd,[%sp]-
ld.a
%rd,-[%sp]
7-71
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