Some of these are feature tests, not regression tests.

This directory needs to be reorganized and some of the tests
need changes to make them executable.  Also comments would help...


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2865 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 155 insertions, 0 deletions

diff --git a/test/CodeGen/Generic/select.ll b/test/CodeGen/Generic/select.ll
new file mode 100644
index 0000000000..973bc7e88e
--- /dev/null
+++ b/test/CodeGen/Generic/select.ll
@@ -0,0 +1,155 @@
+%AConst    = constant int 123
+
+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
+	%a2= 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, 3.1415	; 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)
+	%g = 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)
+	%h = 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]
+	not bool %0			; <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, int)   ; Def %0, %1
+	const int 0          ; Def 2
+	const int -4         ; Def 3
+begin
+; <label>:0
+	br label %Top
+Top:
+	add int %0, %1    ; Def 4
+	sub int %4, %3    ; Def 5
+	setle int %5, %2  ; Def 0 - bool plane
+	br bool %0, label %retlbl, label %loop
+
+loop:
+	add int %0, %1    ; Def 6
+	sub int %4, %3    ; Def 7
+	setle int %7, %2  ; Def 1 - bool
+	not bool %1		  ; Def 2 - bool. first use of bool %1
+	br bool %1, label %loop, label %Top   ;  second use of bool %1
+
+retlbl:
+	ret void
+end
+
+
+; 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 = not bool %b	 ; 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 int*	;; reg114 will be propagated
+	%reg116 = add int* %A, %cast115		;;
+	%reg118 = load int* %reg116		;;
+	%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 void
+end