1 ; RUN: llvm-as -f %s -o - | llc
3 %AConst = constant int 123
5 %Domain = type { sbyte*, int, int*, int, int, int*, %Domain* }
9 ; Test setting values of different constants in registers.
11 void "testConsts"(int %N, float %X)
14 %a = add int %N, 1 ; 1 should be put in immed field
15 %i = add int %N, 12345678 ; constant has to be loaded
16 %b = add short 4, 3 ; one of the operands shd be immed
17 %c = add float %X, 0.0 ; will this be optimzzed?
18 %d = add float %X, 3.1415 ; constant has to be loaded
19 %f = add uint 4294967295, 10 ; result shd be 9 (not in immed fld)
20 %g = add ushort 20, 65535 ; result shd be 19 (65536 in immed fld)
21 %j = add ushort 65535, 30 ; result shd be 29 (not in immed fld)
22 %h = add ubyte 40, 255 ; result shd be 39 (255 in immed fld)
23 %k = add ubyte 255, 50 ; result shd be 49 (not in immed fld)
28 ; A SetCC whose result is used should produce instructions to
29 ; compute the boolean value in a register. One whose result
30 ; is unused will only generate the condition code but not
33 void "unusedBool"(int * %x, int * %y)
35 ; <label>:0 ; [#uses=0]
36 seteq int * %x, %y ; <bool>:0 [#uses=1]
37 xor bool %0, true ; <bool>:1 [#uses=0]
38 setne int * %x, %y ; <bool>:2 [#uses=0]
42 ; A constant argument to a Phi produces a Cast instruction in the
43 ; corresponding predecessor basic block. This checks a few things:
44 ; -- phi arguments coming from the bottom of the same basic block
45 ; (they should not be forward substituted in the machine code!)
46 ; -- code generation for casts of various types
47 ; -- use of immediate fields for integral constants of different sizes
48 ; -- branch on a constant condition
50 void "mergeConstants"(int * %x, int * %y)
55 phi int [ 0, %0 ], [ 1, %Top ], [ 524288, %Next ]
56 phi float [ 0.0, %0 ], [ 1.0, %Top ], [ 2.0, %Next ]
57 phi double [ 0.5, %0 ], [ 1.5, %Top ], [ 2.5, %Next ]
58 phi bool [ true, %0 ], [ false,%Top ], [ true, %Next ]
59 br bool true, label %Top, label %Next
66 ; A constant argument to a cast used only once should be forward substituted
67 ; and loaded where needed, which happens is:
68 ; -- User of cast has no immediate field
69 ; -- User of cast has immediate field but constant is too large to fit
70 ; or constant is not resolved until later (e.g., global address)
71 ; -- User of cast uses it as a call arg. or return value so it is an implicit
72 ; use but has to be loaded into a virtual register so that the reg.
73 ; allocator can allocate the appropriate phys. reg. for it
75 int* "castconst"(float)
78 %castbig = cast ulong 99999999 to int
79 %castsmall = cast ulong 1 to int
80 %usebig = add int %castbig, %castsmall
82 %castglob = cast int* %AConst to long*
83 %dummyl = load long* %castglob
85 %castnull = cast ulong 0 to int*
91 ; Test branch-on-comparison-with-zero, in two ways:
93 ; 2. cannot be folded because result of comparison is used twice
95 void "testbool"(int %A, int %B) {
101 br bool %C, label %retlbl, label %loop
107 %E = xor bool %D, true
108 br bool %E, label %loop, label %Top
115 ;; Test use of a boolean result in cast operations.
116 ;; Requires converting a condition code result into a 0/1 value in a reg.
120 int %castbool(int %A, int %B) {
122 %cond213 = setlt int %A, %B ; <bool> [#uses=1]
123 %cast110 = cast bool %cond213 to ubyte ; <ubyte> [#uses=1]
124 %cast109 = cast ubyte %cast110 to int ; <int> [#uses=1]
129 ;; Test use of a boolean result in arithmetic and logical operations.
130 ;; Requires converting a condition code result into a 0/1 value in a reg.
132 bool %boolexpr(bool %b, int %N) {
133 %b2 = setge int %N, 0
134 %b3 = and bool %b, %b2
139 ; Test branch on floating point comparison
141 void "testfloatbool"(float %x, float %y) ; Def %0, %1 - float
146 %p = add float %x, %y ; Def 2 - float
147 %z = sub float %x, %y ; Def 3 - float
148 %b = setle float %p, %z ; Def 0 - bool
149 %c = xor bool %b, true ; Def 1 - bool
150 br bool %b, label %Top, label %goon
156 ; Test cases where an LLVM instruction requires no machine
157 ; instructions (e.g., cast int* to long). But there are 2 cases:
158 ; 1. If the result register has only a single use and the use is in the
159 ; same basic block, the operand will be copy-propagated during
160 ; instruction selection.
161 ; 2. If the result register has multiple uses or is in a different
162 ; basic block, it cannot (or will not) be copy propagated during
163 ; instruction selection. It will generate a
164 ; copy instruction (add-with-0), but this copy should get coalesced
165 ; away by the register allocator.
167 int "checkForward"(int %N, int* %A)
171 %reg114 = shl int %N, ubyte 2 ;;
172 %cast115 = cast int %reg114 to long ;; reg114 will be propagated
173 %cast116 = cast int* %A to long ;; %A will be propagated
174 %reg116 = add long %cast116, %cast115 ;;
175 %castPtr = cast long %reg116 to int* ;; %A will be propagated
176 %reg118 = load int* %castPtr ;;
177 %cast117 = cast int %reg118 to long ;; reg118 will be copied 'cos
178 %reg159 = add long 1234567, %cast117 ;; cast117 has 2 uses, here
179 %reg160 = add long 7654321, %cast117 ;; and here.
184 ; Test case for unary NOT operation constructed from XOR.
186 void "checkNot"(bool %b, int %i)
188 %notB = xor bool %b, true
189 %notI = xor int %i, -1
190 %F = setge int %notI, 100
192 %andNotB = and bool %F, %notB ;; should get folded with notB
193 %andNotI = and int %J, %notI ;; should get folded with notI
195 %notB2 = xor bool true, %b ;; should become XNOR
196 %notI2 = xor int -1, %i ;; should become XNOR
202 ; Test case for folding getelementptr into a load/store
204 int "checkFoldGEP"(%Domain* %D, long %idx)
206 %reg841 = getelementptr %Domain* %D, long 0, ubyte 1
207 %reg820 = load int* %reg841