; RUN: llc < %s
%Domain = type { ptr, i32, ptr, i32, i32, ptr, ptr }
@AConst = constant i32 123 ; <ptr> [#uses=1]
; Test setting values of different constants in registers.
;
define void @testConsts(i32 %N, float %X) {
%a = add i32 %N, 1 ; <i32> [#uses=0]
%i = add i32 %N, 12345678 ; <i32> [#uses=0]
%b = add i16 4, 3 ; <i16> [#uses=0]
%c = fadd float %X, 0.000000e+00 ; <float> [#uses=0]
%d = fadd float %X, 0x400921CAC0000000 ; <float> [#uses=0]
%f = add i32 -1, 10 ; <i32> [#uses=0]
%g = add i16 20, -1 ; <i16> [#uses=0]
%j = add i16 -1, 30 ; <i16> [#uses=0]
%h = add i8 40, -1 ; <i8> [#uses=0]
%k = add i8 -1, 50 ; <i8> [#uses=0]
ret void
}
; 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.
;
define void @unusedBool(ptr %x, ptr %y) {
icmp eq ptr %x, %y ; <i1>:1 [#uses=1]
xor i1 %1, true ; <i1>:2 [#uses=0]
icmp ne ptr %x, %y ; <i1>:3 [#uses=0]
ret void
}
; 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
;
define void @mergeConstants(ptr %x, ptr %y) {
; <label>:0
br label %Top
Top: ; preds = %Next, %Top, %0
phi i32 [ 0, %0 ], [ 1, %Top ], [ 524288, %Next ] ; <i32>:1 [#uses=0]
phi float [ 0.000000e+00, %0 ], [ 1.000000e+00, %Top ], [ 2.000000e+00, %Next ] ; <float>:2 [#uses=0]
phi double [ 5.000000e-01, %0 ], [ 1.500000e+00, %Top ], [ 2.500000e+00, %Next ]
phi i1 [ true, %0 ], [ false, %Top ], [ true, %Next ] ; <i1>:4 [#uses=0]
br i1 true, label %Top, label %Next
Next: ; preds = %Top
br label %Top
}
; 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
;
define ptr @castconst(float) {
%castbig = trunc i64 99999999 to i32 ; <i32> [#uses=1]
%castsmall = trunc i64 1 to i32 ; <i32> [#uses=1]
%usebig = add i32 %castbig, %castsmall ; <i32> [#uses=0]
%dummyl = load i64, ptr @AConst ; <i64> [#uses=0]
%castnull = inttoptr i64 0 to ptr ; <ptr> [#uses=1]
ret ptr %castnull
}
; Test branch-on-comparison-with-zero, in two ways:
; 1. can be folded
; 2. cannot be folded because result of comparison is used twice
;
define void @testbool(i32 %A, i32 %B) {
br label %Top
Top: ; preds = %loop, %0
%D = add i32 %A, %B ; <i32> [#uses=2]
%E = sub i32 %D, -4 ; <i32> [#uses=1]
%C = icmp sle i32 %E, 0 ; <i1> [#uses=1]
br i1 %C, label %retlbl, label %loop
loop: ; preds = %loop, %Top
%F = add i32 %A, %B ; <i32> [#uses=0]
%G = sub i32 %D, -4 ; <i32> [#uses=1]
%D.upgrd.1 = icmp sle i32 %G, 0 ; <i1> [#uses=1]
%E.upgrd.2 = xor i1 %D.upgrd.1, true ; <i1> [#uses=1]
br i1 %E.upgrd.2, label %loop, label %Top
retlbl: ; preds = %Top
ret void
}
;; Test use of a boolean result in cast operations.
;; Requires converting a condition code result into a 0/1 value in a reg.
;;
define i32 @castbool(i32 %A, i32 %B) {
bb0:
%cond213 = icmp slt i32 %A, %B ; <i1> [#uses=1]
%cast110 = zext i1 %cond213 to i8 ; <i8> [#uses=1]
%cast109 = zext i8 %cast110 to i32 ; <i32> [#uses=1]
ret i32 %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.
;;
define i1 @boolexpr(i1 %b, i32 %N) {
%b2 = icmp sge i32 %N, 0 ; <i1> [#uses=1]
%b3 = and i1 %b, %b2 ; <i1> [#uses=1]
ret i1 %b3
}
; Test branch on floating point comparison
;
define void @testfloatbool(float %x, float %y) {
br label %Top
Top: ; preds = %Top, %0
%p = fadd float %x, %y ; <float> [#uses=1]
%z = fsub float %x, %y ; <float> [#uses=1]
%b = fcmp ole float %p, %z ; <i1> [#uses=2]
%c = xor i1 %b, true ; <i1> [#uses=0]
br i1 %b, label %Top, label %goon
goon: ; preds = %Top
ret void
}
; 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.
;
define i32 @checkForward(i32 %N, ptr %A) {
bb2:
%reg114 = shl i32 %N, 2 ; <i32> [#uses=1]
%cast115 = sext i32 %reg114 to i64 ; <i64> [#uses=1]
%cast116 = ptrtoint ptr %A to i64 ; <i64> [#uses=1]
%reg116 = add i64 %cast116, %cast115 ; <i64> [#uses=1]
%castPtr = inttoptr i64 %reg116 to ptr ; <ptr> [#uses=1]
%reg118 = load i32, ptr %castPtr ; <i32> [#uses=1]
%cast117 = sext i32 %reg118 to i64 ; <i64> [#uses=2]
%reg159 = add i64 1234567, %cast117 ; <i64> [#uses=0]
%reg160 = add i64 7654321, %cast117 ; <i64> [#uses=0]
ret i32 0
}
; Test case for unary NOT operation constructed from XOR.
;
define void @checkNot(i1 %b, i32 %i) {
%notB = xor i1 %b, true ; <i1> [#uses=1]
%notI = xor i32 %i, -1 ; <i32> [#uses=2]
%F = icmp sge i32 %notI, 100 ; <i1> [#uses=1]
%J = add i32 %i, %i ; <i32> [#uses=1]
%andNotB = and i1 %F, %notB ; <i1> [#uses=0]
%andNotI = and i32 %J, %notI ; <i32> [#uses=0]
%notB2 = xor i1 true, %b ; <i1> [#uses=0]
%notI2 = xor i32 -1, %i ; <i32> [#uses=0]
ret void
}
; Test case for folding getelementptr into a load/store
;
define i32 @checkFoldGEP(ptr %D, i64 %idx) {
%reg841 = getelementptr %Domain, ptr %D, i64 0, i32 1 ; <ptr> [#uses=1]
%reg820 = load i32, ptr %reg841 ; <i32> [#uses=1]
ret i32 %reg820
}
; Test case for scalarising a 1 element vselect
;
define <1 x i32> @checkScalariseVSELECT(<1 x i32> %a, <1 x i32> %b) {
%cond = icmp uge <1 x i32> %a, %b
%s = select <1 x i1> %cond, <1 x i32> %a, <1 x i32> %b
ret <1 x i32> %s
}
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