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a83b45d7b5
numerator is an induction variable. For example, with code like this:
for (i=0;i<n;++i)
x[i%n] = 0;
IndVarSimplify will now recognize that i is always less than n inside
the loop, and eliminate the remainder.
llvm-svn: 101113
122 lines
5.2 KiB
LLVM
122 lines
5.2 KiB
LLVM
; RUN: opt -indvars -S < %s | FileCheck %s
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
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; Indvars should be able to eliminate this srem.
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; CHECK: @simple
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; CHECK-NOT: rem
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; CHECK: ret
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define void @simple(i64 %arg, double* %arg3) nounwind {
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bb:
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%t = icmp slt i64 0, %arg ; <i1> [#uses=1]
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br i1 %t, label %bb4, label %bb12
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bb4: ; preds = %bb
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br label %bb5
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bb5: ; preds = %bb4, %bb5
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%t6 = phi i64 [ %t9, %bb5 ], [ 0, %bb4 ] ; <i64> [#uses=2]
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%t7 = srem i64 %t6, %arg ; <i64> [#uses=1]
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%t8 = getelementptr inbounds double* %arg3, i64 %t7 ; <double*> [#uses=1]
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store double 0.000000e+00, double* %t8
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%t9 = add nsw i64 %t6, 1 ; <i64> [#uses=2]
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%t10 = icmp slt i64 %t9, %arg ; <i1> [#uses=1]
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br i1 %t10, label %bb5, label %bb11
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bb11: ; preds = %bb5
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br label %bb12
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bb12: ; preds = %bb11, %bb
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ret void
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}
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; Indvars should be able to eliminate the (i+1)%n.
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; CHECK: @f
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; CHECK-NOT: rem
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; CHECK: rem
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; CHECK-NOT: rem
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; CHECK: ret
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define i32 @f(i64* %arg, i64 %arg1, i64 %arg2, i64 %arg3) nounwind {
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bb:
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%t = icmp sgt i64 %arg1, 0 ; <i1> [#uses=1]
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br i1 %t, label %bb4, label %bb54
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bb4: ; preds = %bb
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br label %bb5
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bb5: ; preds = %bb49, %bb4
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%t6 = phi i64 [ %t51, %bb49 ], [ 0, %bb4 ] ; <i64> [#uses=4]
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%t7 = phi i32 [ %t50, %bb49 ], [ 0, %bb4 ] ; <i32> [#uses=2]
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%t8 = add nsw i64 %t6, %arg1 ; <i64> [#uses=1]
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%t9 = add nsw i64 %t8, -2 ; <i64> [#uses=1]
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%t10 = srem i64 %t9, %arg1 ; <i64> [#uses=1]
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%t11 = add nsw i64 %t10, 1 ; <i64> [#uses=1]
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%t12 = add nsw i64 %t6, 1 ; <i64> [#uses=1]
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%t13 = srem i64 %t12, %arg1 ; <i64> [#uses=1]
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%t14 = icmp sgt i64 %arg1, 0 ; <i1> [#uses=1]
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br i1 %t14, label %bb15, label %bb49
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bb15: ; preds = %bb5
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br label %bb16
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bb16: ; preds = %bb44, %bb15
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%t17 = phi i64 [ %t46, %bb44 ], [ 0, %bb15 ] ; <i64> [#uses=1]
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%t18 = phi i32 [ %t45, %bb44 ], [ %t7, %bb15 ] ; <i32> [#uses=2]
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%t19 = icmp sgt i64 %arg1, 0 ; <i1> [#uses=1]
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br i1 %t19, label %bb20, label %bb44
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bb20: ; preds = %bb16
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br label %bb21
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bb21: ; preds = %bb21, %bb20
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%t22 = phi i64 [ %t41, %bb21 ], [ 0, %bb20 ] ; <i64> [#uses=4]
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%t23 = phi i32 [ %t40, %bb21 ], [ %t18, %bb20 ] ; <i32> [#uses=1]
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%t24 = mul i64 %t6, %arg1 ; <i64> [#uses=1]
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%t25 = mul i64 %t13, %arg1 ; <i64> [#uses=1]
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%t26 = add nsw i64 %t24, %t22 ; <i64> [#uses=1]
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%t27 = mul i64 %t11, %arg1 ; <i64> [#uses=1]
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%t28 = add nsw i64 %t25, %t22 ; <i64> [#uses=1]
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%t29 = getelementptr inbounds i64* %arg, i64 %t26 ; <i64*> [#uses=1]
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%t30 = add nsw i64 %t27, %t22 ; <i64> [#uses=1]
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%t31 = getelementptr inbounds i64* %arg, i64 %t28 ; <i64*> [#uses=1]
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%t32 = zext i32 %t23 to i64 ; <i64> [#uses=1]
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%t33 = load i64* %t29 ; <i64> [#uses=1]
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%t34 = getelementptr inbounds i64* %arg, i64 %t30 ; <i64*> [#uses=1]
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%t35 = load i64* %t31 ; <i64> [#uses=1]
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%t36 = add nsw i64 %t32, %t33 ; <i64> [#uses=1]
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%t37 = add nsw i64 %t36, %t35 ; <i64> [#uses=1]
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%t38 = load i64* %t34 ; <i64> [#uses=1]
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%t39 = add nsw i64 %t37, %t38 ; <i64> [#uses=1]
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%t40 = trunc i64 %t39 to i32 ; <i32> [#uses=2]
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%t41 = add nsw i64 %t22, 1 ; <i64> [#uses=2]
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%t42 = icmp slt i64 %t41, %arg1 ; <i1> [#uses=1]
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br i1 %t42, label %bb21, label %bb43
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bb43: ; preds = %bb21
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br label %bb44
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bb44: ; preds = %bb43, %bb16
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%t45 = phi i32 [ %t18, %bb16 ], [ %t40, %bb43 ] ; <i32> [#uses=2]
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%t46 = add nsw i64 %t17, 1 ; <i64> [#uses=2]
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%t47 = icmp slt i64 %t46, %arg1 ; <i1> [#uses=1]
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br i1 %t47, label %bb16, label %bb48
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bb48: ; preds = %bb44
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br label %bb49
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bb49: ; preds = %bb48, %bb5
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%t50 = phi i32 [ %t7, %bb5 ], [ %t45, %bb48 ] ; <i32> [#uses=2]
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%t51 = add nsw i64 %t6, 1 ; <i64> [#uses=2]
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%t52 = icmp slt i64 %t51, %arg1 ; <i1> [#uses=1]
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br i1 %t52, label %bb5, label %bb53
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bb53: ; preds = %bb49
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br label %bb54
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bb54: ; preds = %bb53, %bb
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%t55 = phi i32 [ 0, %bb ], [ %t50, %bb53 ] ; <i32> [#uses=1]
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ret i32 %t55
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}
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