forked from OSchip/llvm-project
210 lines
6.1 KiB
LLVM
210 lines
6.1 KiB
LLVM
; RUN: llvm-upgrade %s | llvm-as | llc
|
|
|
|
%AConst = constant int 123
|
|
|
|
%Domain = type { sbyte*, int, int*, int, int, int*, %Domain* }
|
|
|
|
implementation
|
|
|
|
; Test setting values of different constants in registers.
|
|
;
|
|
void "testConsts"(int %N, float %X)
|
|
begin
|
|
; <label>:0
|
|
%a = add int %N, 1 ; 1 should be put in immed field
|
|
%i = add int %N, 12345678 ; constant has to be loaded
|
|
%b = add short 4, 3 ; one of the operands shd be immed
|
|
%c = add float %X, 0.0 ; will this be optimzzed?
|
|
%d = add float %X, 0x400921CAC0000000 ; constant has to be loaded
|
|
%f = add uint 4294967295, 10 ; result shd be 9 (not in immed fld)
|
|
%g = add ushort 20, 65535 ; result shd be 19 (65536 in immed fld)
|
|
%j = add ushort 65535, 30 ; result shd be 29 (not in immed fld)
|
|
%h = add ubyte 40, 255 ; result shd be 39 (255 in immed fld)
|
|
%k = add ubyte 255, 50 ; result shd be 49 (not in immed fld)
|
|
|
|
ret void
|
|
end
|
|
|
|
; A SetCC whose result is used should produce instructions to
|
|
; compute the boolean value in a register. One whose result
|
|
; is unused will only generate the condition code but not
|
|
; the boolean result.
|
|
;
|
|
void "unusedBool"(int * %x, int * %y)
|
|
begin
|
|
; <label>:0 ; [#uses=0]
|
|
seteq int * %x, %y ; <bool>:0 [#uses=1]
|
|
xor bool %0, true ; <bool>:1 [#uses=0]
|
|
setne int * %x, %y ; <bool>:2 [#uses=0]
|
|
ret void
|
|
end
|
|
|
|
; A constant argument to a Phi produces a Cast instruction in the
|
|
; corresponding predecessor basic block. This checks a few things:
|
|
; -- phi arguments coming from the bottom of the same basic block
|
|
; (they should not be forward substituted in the machine code!)
|
|
; -- code generation for casts of various types
|
|
; -- use of immediate fields for integral constants of different sizes
|
|
; -- branch on a constant condition
|
|
;
|
|
void "mergeConstants"(int * %x, int * %y)
|
|
begin
|
|
; <label>:0
|
|
br label %Top
|
|
Top:
|
|
phi int [ 0, %0 ], [ 1, %Top ], [ 524288, %Next ]
|
|
phi float [ 0.0, %0 ], [ 1.0, %Top ], [ 2.0, %Next ]
|
|
phi double [ 0.5, %0 ], [ 1.5, %Top ], [ 2.5, %Next ]
|
|
phi bool [ true, %0 ], [ false,%Top ], [ true, %Next ]
|
|
br bool true, label %Top, label %Next
|
|
Next:
|
|
br label %Top
|
|
end
|
|
|
|
|
|
|
|
; A constant argument to a cast used only once should be forward substituted
|
|
; and loaded where needed, which happens is:
|
|
; -- User of cast has no immediate field
|
|
; -- User of cast has immediate field but constant is too large to fit
|
|
; or constant is not resolved until later (e.g., global address)
|
|
; -- User of cast uses it as a call arg. or return value so it is an implicit
|
|
; use but has to be loaded into a virtual register so that the reg.
|
|
; allocator can allocate the appropriate phys. reg. for it
|
|
;
|
|
int* "castconst"(float)
|
|
begin
|
|
; <label>:0
|
|
%castbig = cast ulong 99999999 to int
|
|
%castsmall = cast ulong 1 to int
|
|
%usebig = add int %castbig, %castsmall
|
|
|
|
%castglob = cast int* %AConst to long*
|
|
%dummyl = load long* %castglob
|
|
|
|
%castnull = cast ulong 0 to int*
|
|
ret int* %castnull
|
|
end
|
|
|
|
|
|
|
|
; Test branch-on-comparison-with-zero, in two ways:
|
|
; 1. can be folded
|
|
; 2. cannot be folded because result of comparison is used twice
|
|
;
|
|
void "testbool"(int %A, int %B) {
|
|
br label %Top
|
|
Top:
|
|
%D = add int %A, %B
|
|
%E = sub int %D, -4
|
|
%C = setle int %E, 0
|
|
br bool %C, label %retlbl, label %loop
|
|
|
|
loop:
|
|
%F = add int %A, %B
|
|
%G = sub int %D, -4
|
|
%D = setle int %G, 0
|
|
%E = xor bool %D, true
|
|
br bool %E, label %loop, label %Top
|
|
|
|
retlbl:
|
|
ret void
|
|
end
|
|
|
|
|
|
;; Test use of a boolean result in cast operations.
|
|
;; Requires converting a condition code result into a 0/1 value in a reg.
|
|
;;
|
|
implementation
|
|
|
|
int %castbool(int %A, int %B) {
|
|
bb0: ; [#uses=0]
|
|
%cond213 = setlt int %A, %B ; <bool> [#uses=1]
|
|
%cast110 = cast bool %cond213 to ubyte ; <ubyte> [#uses=1]
|
|
%cast109 = cast ubyte %cast110 to int ; <int> [#uses=1]
|
|
ret int %cast109
|
|
}
|
|
|
|
|
|
;; Test use of a boolean result in arithmetic and logical operations.
|
|
;; Requires converting a condition code result into a 0/1 value in a reg.
|
|
;;
|
|
bool %boolexpr(bool %b, int %N) {
|
|
%b2 = setge int %N, 0
|
|
%b3 = and bool %b, %b2
|
|
ret bool %b3
|
|
}
|
|
|
|
|
|
; Test branch on floating point comparison
|
|
;
|
|
void "testfloatbool"(float %x, float %y) ; Def %0, %1 - float
|
|
begin
|
|
; <label>:0
|
|
br label %Top
|
|
Top:
|
|
%p = add float %x, %y ; Def 2 - float
|
|
%z = sub float %x, %y ; Def 3 - float
|
|
%b = setle float %p, %z ; Def 0 - bool
|
|
%c = xor bool %b, true ; Def 1 - bool
|
|
br bool %b, label %Top, label %goon
|
|
goon:
|
|
ret void
|
|
end
|
|
|
|
|
|
; Test cases where an LLVM instruction requires no machine
|
|
; instructions (e.g., cast int* to long). But there are 2 cases:
|
|
; 1. If the result register has only a single use and the use is in the
|
|
; same basic block, the operand will be copy-propagated during
|
|
; instruction selection.
|
|
; 2. If the result register has multiple uses or is in a different
|
|
; basic block, it cannot (or will not) be copy propagated during
|
|
; instruction selection. It will generate a
|
|
; copy instruction (add-with-0), but this copy should get coalesced
|
|
; away by the register allocator.
|
|
;
|
|
int "checkForward"(int %N, int* %A)
|
|
begin
|
|
|
|
bb2: ;;<label>
|
|
%reg114 = shl int %N, ubyte 2 ;;
|
|
%cast115 = cast int %reg114 to long ;; reg114 will be propagated
|
|
%cast116 = cast int* %A to long ;; %A will be propagated
|
|
%reg116 = add long %cast116, %cast115 ;;
|
|
%castPtr = cast long %reg116 to int* ;; %A will be propagated
|
|
%reg118 = load int* %castPtr ;;
|
|
%cast117 = cast int %reg118 to long ;; reg118 will be copied 'cos
|
|
%reg159 = add long 1234567, %cast117 ;; cast117 has 2 uses, here
|
|
%reg160 = add long 7654321, %cast117 ;; and here.
|
|
ret int 0
|
|
end
|
|
|
|
|
|
; Test case for unary NOT operation constructed from XOR.
|
|
;
|
|
void "checkNot"(bool %b, int %i)
|
|
begin
|
|
%notB = xor bool %b, true
|
|
%notI = xor int %i, -1
|
|
%F = setge int %notI, 100
|
|
%J = add int %i, %i
|
|
%andNotB = and bool %F, %notB ;; should get folded with notB
|
|
%andNotI = and int %J, %notI ;; should get folded with notI
|
|
|
|
%notB2 = xor bool true, %b ;; should become XNOR
|
|
%notI2 = xor int -1, %i ;; should become XNOR
|
|
|
|
ret void
|
|
end
|
|
|
|
|
|
; Test case for folding getelementptr into a load/store
|
|
;
|
|
int "checkFoldGEP"(%Domain* %D, long %idx)
|
|
begin
|
|
%reg841 = getelementptr %Domain* %D, long 0, uint 1
|
|
%reg820 = load int* %reg841
|
|
ret int %reg820
|
|
end
|