[mips][microMIPS] Add CodeGen support for ADD, ADDIU*, ADDU* and DADD* instructions
Differential Revision: http://reviews.llvm.org/D16454
llvm-svn: 265772
diff --git a/llvm/test/CodeGen/Mips/llvm-ir/add.ll b/llvm/test/CodeGen/Mips/llvm-ir/add.ll
index 6cccc7d..ec06ad4 100644
--- a/llvm/test/CodeGen/Mips/llvm-ir/add.ll
+++ b/llvm/test/CodeGen/Mips/llvm-ir/add.ll
@@ -24,14 +24,28 @@
; RUN: -check-prefix=ALL -check-prefix=R2-R6 -check-prefix=GP64
; RUN: llc < %s -march=mips64 -mcpu=mips64r6 | FileCheck %s \
; RUN: -check-prefix=ALL -check-prefix=R2-R6 -check-prefix=GP64
+; RUN: llc < %s -march=mips -mcpu=mips32r3 -mattr=+micromips -O2 | FileCheck %s \
+; RUN: -check-prefix=ALL -check-prefix=MMR6 -check-prefix=MM32
+; RUN: llc < %s -march=mips -mcpu=mips32r6 -mattr=+micromips -O2 | FileCheck %s \
+; RUN: -check-prefix=ALL -check-prefix=MMR6 -check-prefix=MM32
+; RUN: llc < %s -march=mips -mcpu=mips64r6 -mattr=+micromips -O2 | FileCheck %s \
+; RUN: -check-prefix=ALL -check-prefix=MMR6 -check-prefix=MM64
define signext i1 @add_i1(i1 signext %a, i1 signext %b) {
entry:
; ALL-LABEL: add_i1:
- ; ALL: addu $[[T0:[0-9]+]], $4, $5
- ; ALL: sll $[[T0]], $[[T0]], 31
- ; ALL: sra $2, $[[T0]], 31
+ ; NOT-R2-R6: addu $[[T0:[0-9]+]], $4, $5
+ ; NOT-R2-R6: sll $[[T0]], $[[T0]], 31
+ ; NOT-R2-R6: sra $2, $[[T0]], 31
+
+ ; R2-R6: addu $[[T0:[0-9]+]], $4, $5
+ ; R2-R6: sll $[[T0]], $[[T0]], 31
+ ; R2-R6: sra $2, $[[T0]], 31
+
+ ; MMR6: addu16 $[[T0:[0-9]+]], $4, $5
+ ; MMR6: sll $[[T1:[0-9]+]], $[[T0]], 31
+ ; MMR6: sra $2, $[[T1]], 31
%r = add i1 %a, %b
ret i1 %r
@@ -45,8 +59,11 @@
; NOT-R2-R6: sll $[[T0]], $[[T0]], 24
; NOT-R2-R6: sra $2, $[[T0]], 24
- ; R2-R6: addu $[[T0:[0-9]+]], $4, $5
- ; R2-R6: seb $2, $[[T0:[0-9]+]]
+ ; R2-R6: addu $[[T0:[0-9]+]], $4, $5
+ ; R2-R6: seb $2, $[[T0:[0-9]+]]
+
+ ; MMR6: addu16 $[[T0:[0-9]+]], $4, $5
+ ; MMR6: seb $2, $[[T0]]
%r = add i8 %a, %b
ret i8 %r
@@ -60,8 +77,11 @@
; NOT-R2-R6: sll $[[T0]], $[[T0]], 16
; NOT-R2-R6: sra $2, $[[T0]], 16
- ; R2-R6: addu $[[T0:[0-9]+]], $4, $5
- ; R2-R6: seh $2, $[[T0:[0-9]+]]
+ ; R2-R6: addu $[[T0:[0-9]+]], $4, $5
+ ; R2-R6: seh $2, $[[T0]]
+
+ ; MMR6: addu16 $[[T0:[0-9]+]], $4, $5
+ ; MMR6: seh $2, $[[T0]]
%r = add i16 %a, %b
ret i16 %r
@@ -71,7 +91,10 @@
entry:
; ALL-LABEL: add_i32:
- ; ALL: addu $2, $4, $5
+ ; NOT-R2-R6: addu $2, $4, $5
+ ; R2-R6: addu $2, $4, $5
+
+ ; MMR6: addu16 $[[T0:[0-9]+]], $4, $5
%r = add i32 %a, %b
ret i32 %r
@@ -88,6 +111,13 @@
; GP64: daddu $2, $4, $5
+ ; MM32: addu $3, $5, $7
+ ; MM32: sltu $[[T0:[0-9]+]], $3, $7
+ ; MM32: addu $[[T1:[0-9]+]], $[[T0]], $6
+ ; MM32: addu $2, $4, $[[T1]]
+
+ ; MM64: daddu $2, $4, $5
+
%r = add i64 %a, %b
ret i64 %r
}
@@ -118,6 +148,285 @@
; GP64: daddu $[[T1:[0-9]+]], $[[T0]], $6
; GP64: daddu $2, $4, $[[T1]]
+ ; MM32: lw $[[T0:[0-9]+]], 28($sp)
+ ; MM32: addu $[[T1:[0-9]+]], $7, $[[T0]]
+ ; MM32: sltu $[[T2:[0-9]+]], $[[T1]], $[[T0]]
+ ; MM32: lw $[[T3:[0-9]+]], 24($sp)
+ ; MM32: addu $[[T4:[0-9]+]], $[[T2]], $[[T3]]
+ ; MM32: addu $[[T5:[0-9]+]], $6, $[[T4]]
+ ; MM32: sltu $[[T6:[0-9]+]], $[[T5]], $[[T3]]
+ ; MM32: lw $[[T7:[0-9]+]], 20($sp)
+ ; MM32: addu $[[T8:[0-9]+]], $[[T6]], $[[T7]]
+ ; MM32: addu $[[T9:[0-9]+]], $5, $[[T8]]
+ ; MM32: sltu $[[T10:[0-9]+]], $[[T9]], $[[T7]]
+ ; MM32: lw $[[T11:[0-9]+]], 16($sp)
+ ; MM32: addu $[[T12:[0-9]+]], $[[T10]], $[[T11]]
+ ; MM32: addu $[[T13:[0-9]+]], $4, $[[T12]]
+ ; MM32: move $4, $[[T5]]
+ ; MM32: move $5, $[[T1]]
+
+ ; MM64: daddu $3, $5, $7
+ ; MM64: sltu $[[T0:[0-9]+]], $3, $7
+ ; MM64: daddu $[[T1:[0-9]+]], $[[T0]], $6
+ ; MM64: daddu $2, $4, $[[T1]]
+
%r = add i128 %a, %b
ret i128 %r
}
+
+define signext i1 @add_i1_4(i1 signext %a) {
+; ALL-LABEL: add_i1_4:
+
+ ; ALL: move $2, $4
+
+ %r = add i1 4, %a
+ ret i1 %r
+}
+
+define signext i8 @add_i8_4(i8 signext %a) {
+; ALL-LABEL: add_i8_4:
+
+ ; NOT-R2-R6: sll $[[T0:[0-9]+]], $4, 24
+ ; NOT-R2-R6: lui $[[T1:[0-9]+]], 1024
+ ; NOT-R2-R6: addu $[[T0]], $[[T0]], $[[T1]]
+ ; NOT-R2-R6: sra $2, $[[T0]], 24
+
+ ; R2-R6: addiu $[[T0:[0-9]+]], $4, 4
+ ; R2-R6: seb $2, $[[T0]]
+
+ ; MM32: addiur2 $[[T0:[0-9]+]], $4, 4
+ ; MM32: seb $2, $[[T0]]
+
+ ; MM64: addiur2 $[[T0:[0-9]+]], $4, 4
+ ; MM64: seb $2, $[[T0]]
+
+ %r = add i8 4, %a
+ ret i8 %r
+}
+
+define signext i16 @add_i16_4(i16 signext %a) {
+; ALL-LABEL: add_i16_4:
+
+ ; NOT-R2-R6: sll $[[T0:[0-9]+]], $4, 16
+ ; NOT-R2-R6: lui $[[T1:[0-9]+]], 4
+ ; NOT-R2-R6: addu $[[T0]], $[[T0]], $[[T1]]
+ ; NOT-R2-R6: sra $2, $[[T0]], 16
+
+ ; R2-R6: addiu $[[T0:[0-9]+]], $4, 4
+ ; R2-R6: seh $2, $[[T0]]
+
+ ; MM32: addiur2 $[[T0:[0-9]+]], $4, 4
+ ; MM32: seh $2, $[[T0]]
+
+ ; MM64: addiur2 $[[T0:[0-9]+]], $4, 4
+ ; MM64: seh $2, $[[T0]]
+
+ %r = add i16 4, %a
+ ret i16 %r
+}
+
+define signext i32 @add_i32_4(i32 signext %a) {
+; ALL-LABEL: add_i32_4:
+
+ ; GP32: addiu $2, $4, 4
+
+ ; GP64: addiu $2, $4, 4
+
+ ; MM32: addiur2 $2, $4, 4
+
+ ; MM64: addiur2 $2, $4, 4
+
+ %r = add i32 4, %a
+ ret i32 %r
+}
+
+define signext i64 @add_i64_4(i64 signext %a) {
+; ALL-LABEL: add_i64_4:
+
+ ; GP32: addiu $[[T0:[0-9]+]], $5, 4
+ ; GP32: addiu $[[T1:[0-9]+]], $zero, 4
+ ; GP32: sltu $[[T1]], $[[T0]], $[[T1]]
+ ; GP32: addu $2, $4, $[[T1]]
+
+ ; GP64: daddiu $2, $4, 4
+
+ ; MM32: addiu $[[T0:[0-9]+]], $5, 4
+ ; MM32: li16 $[[T1:[0-9]+]], 4
+ ; MM32: sltu $[[T2:[0-9]+]], $[[T0]], $[[T1]]
+ ; MM32: addu $2, $4, $[[T2]]
+
+ ; MM64: daddiu $2, $4, 4
+
+ %r = add i64 4, %a
+ ret i64 %r
+}
+
+define signext i128 @add_i128_4(i128 signext %a) {
+; ALL-LABEL: add_i128_4:
+
+ ; GP32: addiu $[[T0:[0-9]+]], $7, 4
+ ; GP32: addiu $[[T1:[0-9]+]], $zero, 4
+ ; GP32: sltu $[[T1]], $[[T0]], $[[T1]]
+ ; GP32: addu $[[T2:[0-9]+]], $6, $[[T1]]
+ ; GP32: sltu $[[T1]], $[[T2]], $zero
+ ; GP32: addu $[[T3:[0-9]+]], $5, $[[T1]]
+ ; GP32: sltu $[[T1]], $[[T3]], $zero
+ ; GP32: addu $[[T1]], $4, $[[T1]]
+ ; GP32: move $4, $[[T2]]
+ ; GP32: move $5, $[[T0]]
+
+ ; GP64: daddiu $[[T0:[0-9]+]], $5, 4
+ ; GP64: daddiu $[[T1:[0-9]+]], $zero, 4
+ ; GP64: sltu $[[T1]], $[[T0]], $[[T1]]
+ ; GP64: daddu $2, $4, $[[T1]]
+
+ ; MM32: addiu $[[T0:[0-9]+]], $7, 4
+ ; MM32: li16 $[[T1:[0-9]+]], 4
+ ; MM32: sltu $[[T1]], $[[T0]], $[[T1]]
+ ; MM32: addu $[[T2:[0-9]+]], $6, $[[T1]]
+ ; MM32: lui $[[T1]], 0
+ ; MM32: sltu $[[T3:[0-9]+]], $[[T2]], $[[T1]]
+ ; MM32: addu $[[T3]], $5, $[[T3]]
+ ; MM32: sltu $[[T1]], $[[T3]], $[[T1]]
+ ; MM32: addu $[[T1]], $4, $[[T1]]
+ ; MM32: move $4, $[[T2]]
+ ; MM32: move $5, $[[T0]]
+
+ ; MM64: daddiu $[[T0:[0-9]+]], $5, 4
+ ; MM64: daddiu $[[T1:[0-9]+]], $zero, 4
+ ; MM64: sltu $[[T1]], $[[T0]], $[[T1]]
+ ; MM64: daddu $2, $4, $[[T1]]
+
+ %r = add i128 4, %a
+ ret i128 %r
+}
+
+define signext i1 @add_i1_3(i1 signext %a) {
+; ALL-LABEL: add_i1_3:
+
+ ; ALL: sll $[[T0:[0-9]+]], $4, 31
+ ; ALL: lui $[[T1:[0-9]+]], 32768
+
+ ; GP32: addu $[[T0]], $[[T0]], $[[T1]]
+ ; GP32: sra $[[T1]], $[[T0]], 31
+
+ ; GP64: addu $[[T0]], $[[T0]], $[[T1]]
+ ; GP64: sra $[[T1]], $[[T0]], 31
+
+ ; MMR6: addu16 $[[T0]], $[[T0]], $[[T1]]
+ ; MMR6: sra $[[T0]], $[[T0]], 31
+
+ %r = add i1 3, %a
+ ret i1 %r
+}
+
+define signext i8 @add_i8_3(i8 signext %a) {
+; ALL-LABEL: add_i8_3:
+
+ ; NOT-R2-R6: sll $[[T0:[0-9]+]], $4, 24
+ ; NOT-R2-R6: lui $[[T1:[0-9]+]], 768
+ ; NOT-R2-R6: addu $[[T0]], $[[T0]], $[[T1]]
+ ; NOT-R2-R6: sra $2, $[[T0]], 24
+
+ ; R2-R6: addiu $[[T0:[0-9]+]], $4, 3
+ ; R2-R6: seb $2, $[[T0]]
+
+ ; MMR6: addius5 $[[T0:[0-9]+]], 3
+ ; MMR6: seb $2, $[[T0]]
+
+ %r = add i8 3, %a
+ ret i8 %r
+}
+
+define signext i16 @add_i16_3(i16 signext %a) {
+; ALL-LABEL: add_i16_3:
+
+ ; NOT-R2-R6: sll $[[T0:[0-9]+]], $4, 16
+ ; NOT-R2-R6: lui $[[T1:[0-9]+]], 3
+ ; NOT-R2-R6: addu $[[T0]], $[[T0]], $[[T1]]
+ ; NOT-R2-R6: sra $2, $[[T0]], 16
+
+ ; R2-R6: addiu $[[T0:[0-9]+]], $4, 3
+ ; R2-R6: seh $2, $[[T0]]
+
+ ; MMR6: addius5 $[[T0:[0-9]+]], 3
+ ; MMR6: seh $2, $[[T0]]
+
+ %r = add i16 3, %a
+ ret i16 %r
+}
+
+define signext i32 @add_i32_3(i32 signext %a) {
+; ALL-LABEL: add_i32_3:
+
+ ; NOT-R2-R6: addiu $2, $4, 3
+
+ ; R2-R6: addiu $2, $4, 3
+
+ ; MMR6: addius5 $[[T0:[0-9]+]], 3
+ ; MMR6: move $2, $[[T0]]
+
+ %r = add i32 3, %a
+ ret i32 %r
+}
+
+define signext i64 @add_i64_3(i64 signext %a) {
+; ALL-LABEL: add_i64_3:
+
+ ; GP32: addiu $[[T0:[0-9]+]], $5, 3
+ ; GP32: addiu $[[T1:[0-9]+]], $zero, 3
+ ; GP32: sltu $[[T1]], $[[T0]], $[[T1]]
+ ; GP32: addu $2, $4, $[[T1]]
+
+ ; GP64: daddiu $2, $4, 3
+
+ ; MM32: addiu $[[T0:[0-9]+]], $5, 3
+ ; MM32: li16 $[[T1:[0-9]+]], 3
+ ; MM32: sltu $[[T2:[0-9]+]], $[[T0]], $[[T1]]
+ ; MM32: addu $2, $4, $[[T2]]
+
+ ; MM64: daddiu $2, $4, 3
+
+ %r = add i64 3, %a
+ ret i64 %r
+}
+
+define signext i128 @add_i128_3(i128 signext %a) {
+; ALL-LABEL: add_i128_3:
+
+ ; GP32: addiu $[[T0:[0-9]+]], $7, 3
+ ; GP32: addiu $[[T1:[0-9]+]], $zero, 3
+ ; GP32: sltu $[[T1]], $[[T0]], $[[T1]]
+ ; GP32: addu $[[T2:[0-9]+]], $6, $[[T1]]
+ ; GP32: sltu $[[T3:[0-9]+]], $[[T2]], $zero
+ ; GP32: addu $[[T4:[0-9]+]], $5, $[[T3]]
+ ; GP32: sltu $[[T5:[0-9]+]], $[[T4]], $zero
+ ; GP32: addu $[[T5]], $4, $[[T5]]
+ ; GP32: move $4, $[[T2]]
+ ; GP32: move $5, $[[T0]]
+
+ ; GP64: daddiu $[[T0:[0-9]+]], $5, 3
+ ; GP64: daddiu $[[T1:[0-9]+]], $zero, 3
+ ; GP64: sltu $[[T1]], $[[T0]], $[[T1]]
+ ; GP64: daddu $2, $4, $[[T1]]
+
+ ; MM32: addiu $[[T0:[0-9]+]], $7, 3
+ ; MM32: li16 $[[T1:[0-9]+]], 3
+ ; MM32: sltu $[[T1]], $[[T0]], $[[T1]]
+ ; MM32: addu $[[T2:[0-9]+]], $6, $[[T1]]
+ ; MM32: lui $[[T3:[0-9]+]], 0
+ ; MM32: sltu $[[T4:[0-9]+]], $[[T2]], $[[T3]]
+ ; MM32: addu $[[T4]], $5, $[[T4]]
+ ; MM32: sltu $[[T5:[0-9]+]], $[[T4]], $[[T3]]
+ ; MM32: addu $[[T5]], $4, $[[T5]]
+ ; MM32: move $4, $[[T2]]
+ ; MM32: move $5, $[[T0]]
+
+ ; MM64: daddiu $[[T0:[0-9]+]], $5, 3
+ ; MM64: daddiu $[[T1:[0-9]+]], $zero, 3
+ ; MM64: sltu $[[T1]], $[[T0]], $[[T1]]
+ ; MM64: daddu $2, $4, $[[T1]]
+
+ %r = add i128 3, %a
+ ret i128 %r
+}
diff --git a/llvm/test/MC/Disassembler/Mips/micromips64r6/valid.txt b/llvm/test/MC/Disassembler/Mips/micromips64r6/valid.txt
index eb1ac86..9eff5178b 100644
--- a/llvm/test/MC/Disassembler/Mips/micromips64r6/valid.txt
+++ b/llvm/test/MC/Disassembler/Mips/micromips64r6/valid.txt
@@ -193,3 +193,25 @@
0x59 0x21 0x08 0xfc # CHECK: dmfc0 $9, $1, 1
0x55 0x24 0x24 0x3b # CHECK: dmfc1 $9, $f4
0x01 0xd2 0x6d 0x3c # CHECK: dmfc2 $14, $18
+0x58 0xe6 0x49 0x10 # CHECK: dadd $9, $6, $7
+0x5b 0xe1 0x99 0x10 # CHECK: dadd $19, $1, $ra
+0x5f 0x02 0x46 0x9f # CHECK: daddiu $24, $2, 18079
+0x5d 0x26 0xc5 0x67 # CHECK: daddiu $9, $6, -15001
+0x5d 0x29 0xc5 0x67 # CHECK: daddiu $9, $9, -15001
+0x5d 0x23 0x00 0x20 # CHECK: daddiu $9, $3, 32
+0x5f 0x56 0xee 0x16 # CHECK: daddiu $26, $22, -4586
+0x5d 0xeb 0xec 0x5f # CHECK: daddiu $15, $11, -5025
+0x5d 0xce 0x11 0xea # CHECK: daddiu $14, $14, 4586
+0x5e 0x73 0x69 0x3f # CHECK: daddiu $19, $19, 26943
+0x5d 0x7a 0x7c 0xcd # CHECK: daddiu $11, $26, 31949
+0x5f 0xbd 0xff 0xe0 # CHECK: daddiu $sp, $sp, -32
+0x59 0x61 0xd1 0x50 # CHECK: daddu $26, $1, $11
+0x5b 0xe1 0x99 0x50 # CHECK: daddu $19, $1, $ra
+0x58 0xe6 0x49 0x50 # CHECK: daddu $9, $6, $7
+0x58 0x69 0x49 0x50 # CHECK: daddu $9, $9, $3
+0x5d 0x26 0xc5 0x67 # CHECK: daddiu $9, $6, -15001
+0x5d 0x29 0x00 0x0a # CHECK: daddiu $9, $9, 10
+0x5e 0x73 0x69 0x3f # CHECK: daddiu $19, $19, 26943
+0x5f 0x02 0x46 0x9f # CHECK: daddiu $24, $2, 18079
+0x5c 0x63 0xff 0xfb # CHECK: daddiu $3, $3, -5
+0x5c 0x64 0xff 0xfb # CHECK: daddiu $3, $4, -5
diff --git a/llvm/test/MC/Mips/micromips64r6/valid.s b/llvm/test/MC/Mips/micromips64r6/valid.s
index 8e7870e..3e64314 100644
--- a/llvm/test/MC/Mips/micromips64r6/valid.s
+++ b/llvm/test/MC/Mips/micromips64r6/valid.s
@@ -175,5 +175,28 @@
dmfc0 $9, $1, 1 # CHECK: dmfc0 $9, $1, 1 # encoding: [0x59,0x21,0x08,0xfc]
dmfc1 $9, $f4 # CHECK: dmfc1 $9, $f4 # encoding: [0x55,0x24,0x24,0x3b]
dmfc2 $14, $18 # CHECK: dmfc2 $14, $18 # encoding: [0x01,0xd2,0x6d,0x3c]
+ dadd $9, $6, $7 # CHECK: dadd $9, $6, $7 # encoding: [0x58,0xe6,0x49,0x10]
+ dadd $s3, $at, $ra # CHECK: dadd $19, $1, $ra # encoding: [0x5b,0xe1,0x99,0x10]
+ daddiu $24, $2, 18079 # CHECK: daddiu $24, $2, 18079 # encoding: [0x5f,0x02,0x46,0x9f]
+ daddiu $9, $6, -15001 # CHECK: daddiu $9, $6, -15001 # encoding: [0x5d,0x26,0xc5,0x67]
+ daddiu $9, -15001 # CHECK: daddiu $9, $9, -15001 # encoding: [0x5d,0x29,0xc5,0x67]
+ daddiu $9, $3, 8 * 4 # CHECK: daddiu $9, $3, 32 # encoding: [0x5d,0x23,0x00,0x20]
+ daddiu $9, $3, (8 * 4) # CHECK: daddiu $9, $3, 32 # encoding: [0x5d,0x23,0x00,0x20]
+ daddiu $k0, $s6, -4586 # CHECK: daddiu $26, $22, -4586 # encoding: [0x5f,0x56,0xee,0x16]
+ daddiu $15, $11, -5025 # CHECK: daddiu $15, $11, -5025 # encoding: [0x5d,0xeb,0xec,0x5f]
+ daddiu $14, $14, 4586 # CHECK: daddiu $14, $14, 4586 # encoding: [0x5d,0xce,0x11,0xea]
+ daddiu $19, $19, 26943 # CHECK: daddiu $19, $19, 26943 # encoding: [0x5e,0x73,0x69,0x3f]
+ daddiu $11, $26, 31949 # CHECK: daddiu $11, $26, 31949 # encoding: [0x5d,0x7a,0x7c,0xcd]
+ daddiu $sp, $sp, -32 # CHECK: daddiu $sp, $sp, -32 # encoding: [0x5f,0xbd,0xff,0xe0]
+ daddu $26, $1, $11 # CHECK: daddu $26, $1, $11 # encoding: [0x59,0x61,0xd1,0x50]
+ daddu $19, $1, $ra # CHECK: daddu $19, $1, $ra # encoding: [0x5b,0xe1,0x99,0x50]
+ daddu $9, $6, $7 # CHECK: daddu $9, $6, $7 # encoding: [0x58,0xe6,0x49,0x50]
+ daddu $9, $3 # CHECK: daddu $9, $9, $3 # encoding: [0x58,0x69,0x49,0x50]
+ daddu $9, $6, -15001 # CHECK: daddiu $9, $6, -15001 # encoding: [0x5d,0x26,0xc5,0x67]
+ daddu $9, 10 # CHECK: daddiu $9, $9, 10 # encoding: [0x5d,0x29,0x00,0x0a]
+ daddu $19, 26943 # CHECK: daddiu $19, $19, 26943 # encoding: [0x5e,0x73,0x69,0x3f]
+ daddu $24, $2, 18079 # CHECK: daddiu $24, $2, 18079 # encoding: [0x5f,0x02,0x46,0x9f]
+ dsubu $3, 5 # CHECK: daddiu $3, $3, -5 # encoding: [0x5c,0x63,0xff,0xfb]
+ dsubu $3, $4, 5 # CHECK: daddiu $3, $4, -5 # encoding: [0x5c,0x64,0xff,0xfb]
1: