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fd03ccdaff
Summary: This uses `ScalarEvolution::getRange` and not potentially control dependent `nsw` and `nuw` bits on the arithmetic instruction. Reviewers: atrick, hfinkel, nlewycky Subscribers: llvm-commits, sanjoy Differential Revision: http://reviews.llvm.org/D13613 llvm-svn: 251048
54 lines
1.8 KiB
LLVM
54 lines
1.8 KiB
LLVM
; RUN: opt -scalar-evolution -analyze < %s | FileCheck %s
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;
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; This checks if the min and max expressions are properly recognized by
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; ScalarEvolution even though they the ICmpInst and SelectInst have different
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; types.
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;
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; #define max(a, b) (a > b ? a : b)
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; #define min(a, b) (a < b ? a : b)
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;
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; void f(int *A, int N) {
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; for (int i = 0; i < N; i++) {
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; A[max(0, i - 3)] = A[min(N, i + 3)] * 2;
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; }
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; }
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;
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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define void @f(i32* %A, i32 %N) {
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bb:
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br label %bb1
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bb1: ; preds = %bb2, %bb
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%i.0 = phi i32 [ 0, %bb ], [ %tmp23, %bb2 ]
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%i.0.1 = sext i32 %i.0 to i64
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%tmp = icmp slt i32 %i.0, %N
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br i1 %tmp, label %bb2, label %bb24
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bb2: ; preds = %bb1
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%tmp3 = add nuw nsw i32 %i.0, 3
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%tmp4 = icmp slt i32 %tmp3, %N
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%tmp5 = sext i32 %tmp3 to i64
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%tmp6 = sext i32 %N to i64
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%tmp9 = select i1 %tmp4, i64 %tmp5, i64 %tmp6
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; min(N, i+3)
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; CHECK: select i1 %tmp4, i64 %tmp5, i64 %tmp6
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; CHECK-NEXT: --> (-1 + (-1 * ((-1 + (-1 * (sext i32 {3,+,1}<nuw><%bb1> to i64))<nsw>)<nsw> smax (-1 + (-1 * (sext i32 %N to i64))<nsw>)<nsw>))<nsw>)<nsw>
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%tmp11 = getelementptr inbounds i32, i32* %A, i64 %tmp9
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%tmp12 = load i32, i32* %tmp11, align 4
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%tmp13 = shl nsw i32 %tmp12, 1
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%tmp14 = icmp sge i32 3, %i.0
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%tmp17 = add nsw i64 %i.0.1, -3
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%tmp19 = select i1 %tmp14, i64 0, i64 %tmp17
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; max(0, i - 3)
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; CHECK: select i1 %tmp14, i64 0, i64 %tmp17
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; CHECK-NEXT: --> (-3 + (3 smax {0,+,1}<nuw><nsw><%bb1>))
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%tmp21 = getelementptr inbounds i32, i32* %A, i64 %tmp19
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store i32 %tmp13, i32* %tmp21, align 4
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%tmp23 = add nuw nsw i32 %i.0, 1
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br label %bb1
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bb24: ; preds = %bb1
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ret void
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}
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