1 %AConst = constant int 123
5 ; Test setting values of different constants in registers.
7 void "testConsts"(int %N, float %X)
10 %a = add int %N, 1 ; 1 should be put in immed field
11 %a2= add int %N, 12345678 ; constant has to be loaded
12 %b = add short 4, 3 ; one of the operands shd be immed
13 %c = add float %X, 0.0 ; will this be optimzzed?
14 %d = add float %X, 3.1415 ; constant has to be loaded
15 %f = add uint 4294967295, 10 ; result shd be 9 (not in immed fld)
16 %g = add ushort 20, 65535 ; result shd be 19 (65536 in immed fld)
17 %g = add ushort 65535, 30 ; result shd be 29 (not in immed fld)
18 %h = add ubyte 40, 255 ; result shd be 39 (255 in immed fld)
19 %h = add ubyte 255, 50 ; result shd be 49 (not in immed fld)
24 ; A SetCC whose result is used should produce instructions to
25 ; compute the boolean value in a register. One whose result
26 ; is unused will only generate the condition code but not
29 void "unusedBool"(int * %x, int * %y)
31 ; <label>:0 ; [#uses=0]
32 seteq int * %x, %y ; <bool>:0 [#uses=1]
33 not bool %0 ; <bool>:1 [#uses=0]
34 setne int * %x, %y ; <bool>:2 [#uses=0]
38 ; A constant argument to a Phi produces a Cast instruction in the
39 ; corresponding predecessor basic block. This checks a few things:
40 ; -- phi arguments coming from the bottom of the same basic block
41 ; (they should not be forward substituted in the machine code!)
42 ; -- code generation for casts of various types
43 ; -- use of immediate fields for integral constants of different sizes
44 ; -- branch on a constant condition
46 void "mergeConstants"(int * %x, int * %y)
51 phi int [ 0, %0 ], [ 1, %Top ], [ 524288, %Next ]
52 phi float [ 0.0, %0 ], [ 1.0, %Top ], [ 2.0, %Next ]
53 phi double [ 0.5, %0 ], [ 1.5, %Top ], [ 2.5, %Next ]
54 phi bool [ true, %0 ], [ false,%Top ], [ true, %Next ]
55 br bool true, label %Top, label %Next
62 ; A constant argument to a cast used only once should be forward substituted
63 ; and loaded where needed, which happens is:
64 ; -- User of cast has no immediate field
65 ; -- User of cast has immediate field but constant is too large to fit
66 ; or constant is not resolved until later (e.g., global address)
67 ; -- User of cast uses it as a call arg. or return value so it is an implicit
68 ; use but has to be loaded into a virtual register so that the reg.
69 ; allocator can allocate the appropriate phys. reg. for it
71 int* "castconst"(float)
74 %castbig = cast ulong 99999999 to int
75 %castsmall = cast ulong 1 to int
76 %usebig = add int %castbig, %castsmall
78 %castglob = cast int* %AConst to long*
79 %dummyl = load long* %castglob
81 %castnull = cast ulong 0 to int*
87 ; Test branch-on-comparison-with-zero, in two ways:
89 ; 2. cannot be folded because result of comparison is used twice
91 void "testbool"(int, int) ; Def %0, %1
98 add int %0, %1 ; Def 4
99 sub int %4, %3 ; Def 5
100 setle int %5, %2 ; Def 0 - bool plane
101 br bool %0, label %retlbl, label %loop
104 add int %0, %1 ; Def 6
105 sub int %4, %3 ; Def 7
106 setle int %7, %2 ; Def 1 - bool
107 not bool %1 ; Def 2 - bool. first use of bool %1
108 br bool %1, label %loop, label %Top ; second use of bool %1
115 ; Test branch on floating point comparison
117 void "testfloatbool"(float %x, float %y) ; Def %0, %1 - float
122 %p = add float %x, %y ; Def 2 - float
123 %z = sub float %x, %y ; Def 3 - float
124 %b = setle float %p, %z ; Def 0 - bool
125 %c = not bool %b ; Def 1 - bool
126 br bool %b, label %Top, label %goon
132 ; Test cases where an LLVM instruction requires no machine
133 ; instructions (e.g., cast int* to long). But there are 2 cases:
134 ; 1. If the result register has only a single use and the use is in the
135 ; same basic block, the operand will be copy-propagated during
136 ; instruction selection.
137 ; 2. If the result register has multiple uses or is in a different
138 ; basic block, it cannot (or will not) be copy propagated during
139 ; instruction selection. It will generate a
140 ; copy instruction (add-with-0), but this copy should get coalesced
141 ; away by the register allocator.
143 int "checkForward"(int %N, int* %A)
147 %reg114 = shl int %N, ubyte 2 ;;
148 %cast115 = cast int %reg114 to int* ;; reg114 will be propagated
149 %reg116 = add int* %A, %cast115 ;;
150 %reg118 = load int* %reg116 ;;
151 %cast117 = cast int %reg118 to long ;; reg118 will be copied 'cos
152 %reg159 = add long 1234567, %cast117 ;; cast117 has 2 uses, here
153 %reg160 = add long 7654321, %cast117 ;; and here.