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https://github.com/c64scene-ar/llvm-6502.git
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83196a9fcb
A phi node operand or an instruction operand could be a constant expression that can trap (division). Check that we don't vectorize such cases. PR16729 radar://15653590 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197449 91177308-0d34-0410-b5e6-96231b3b80d8
172 lines
5.1 KiB
LLVM
172 lines
5.1 KiB
LLVM
; RUN: opt < %s -loop-vectorize -force-vector-unroll=1 -force-vector-width=4 -enable-if-conversion -dce -instcombine -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-S128"
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target triple = "x86_64-apple-macosx10.9.0"
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; This is the loop in this example:
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;
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;int function0(int *a, int *b, int start, int end) {
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;
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; for (int i=start; i<end; ++i) {
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; unsigned k = a[i];
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;
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; if (a[i] > b[i]) <------ notice the IF inside the loop.
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; k = k * 5 + 3;
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;
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; a[i] = k; <---- K is a phi node that becomes vector-select.
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; }
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;}
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;CHECK-LABEL: @function0(
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;CHECK: load <4 x i32>
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;CHECK: icmp sgt <4 x i32>
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;CHECK: mul <4 x i32>
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;CHECK: add <4 x i32>
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;CHECK: select <4 x i1>
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;CHECK: ret i32
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define i32 @function0(i32* nocapture %a, i32* nocapture %b, i32 %start, i32 %end) nounwind uwtable ssp {
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entry:
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%cmp16 = icmp slt i32 %start, %end
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br i1 %cmp16, label %for.body.lr.ph, label %for.end
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for.body.lr.ph:
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%0 = sext i32 %start to i64
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br label %for.body
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for.body:
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%indvars.iv = phi i64 [ %0, %for.body.lr.ph ], [ %indvars.iv.next, %if.end ]
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%arrayidx = getelementptr inbounds i32* %a, i64 %indvars.iv
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%1 = load i32* %arrayidx, align 4
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%arrayidx4 = getelementptr inbounds i32* %b, i64 %indvars.iv
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%2 = load i32* %arrayidx4, align 4
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%cmp5 = icmp sgt i32 %1, %2
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br i1 %cmp5, label %if.then, label %if.end
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if.then:
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%mul = mul i32 %1, 5
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%add = add i32 %mul, 3
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br label %if.end
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if.end:
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%k.0 = phi i32 [ %add, %if.then ], [ %1, %for.body ]
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store i32 %k.0, i32* %arrayidx, align 4
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%indvars.iv.next = add i64 %indvars.iv, 1
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%3 = trunc i64 %indvars.iv.next to i32
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%cmp = icmp slt i32 %3, %end
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br i1 %cmp, label %for.body, label %for.end
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for.end:
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ret i32 undef
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}
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; int func(int *A, int n) {
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; unsigned sum = 0;
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; for (int i = 0; i < n; ++i)
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; if (A[i] > 30)
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; sum += A[i] + 2;
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;
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; return sum;
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; }
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;CHECK-LABEL: @reduction_func(
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;CHECK: load <4 x i32>
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;CHECK: icmp sgt <4 x i32>
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;CHECK: add <4 x i32>
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;CHECK: select <4 x i1>
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;CHECK: ret i32
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define i32 @reduction_func(i32* nocapture %A, i32 %n) nounwind uwtable readonly ssp {
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entry:
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%cmp10 = icmp sgt i32 %n, 0
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br i1 %cmp10, label %for.body, label %for.end
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for.body: ; preds = %entry, %for.inc
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%indvars.iv = phi i64 [ %indvars.iv.next, %for.inc ], [ 0, %entry ]
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%sum.011 = phi i32 [ %sum.1, %for.inc ], [ 0, %entry ]
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%arrayidx = getelementptr inbounds i32* %A, i64 %indvars.iv
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%0 = load i32* %arrayidx, align 4
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%cmp1 = icmp sgt i32 %0, 30
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br i1 %cmp1, label %if.then, label %for.inc
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if.then: ; preds = %for.body
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%add = add i32 %sum.011, 2
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%add4 = add i32 %add, %0
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br label %for.inc
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for.inc: ; preds = %for.body, %if.then
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%sum.1 = phi i32 [ %add4, %if.then ], [ %sum.011, %for.body ]
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%indvars.iv.next = add i64 %indvars.iv, 1
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%lftr.wideiv = trunc i64 %indvars.iv.next to i32
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%exitcond = icmp eq i32 %lftr.wideiv, %n
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br i1 %exitcond, label %for.end, label %for.body
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for.end: ; preds = %for.inc, %entry
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%sum.0.lcssa = phi i32 [ 0, %entry ], [ %sum.1, %for.inc ]
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ret i32 %sum.0.lcssa
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}
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@a = common global [1 x i32*] zeroinitializer, align 8
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@c = common global i32* null, align 8
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; We use to if convert this loop. This is not safe because there is a trapping
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; constant expression.
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; PR16729
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; CHECK-LABEL: trapping_constant_expression
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; CHECK-NOT: or <4 x i32>
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define i32 @trapping_constant_expression() {
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entry:
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br label %for.body
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for.body:
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%inc3 = phi i32 [ 0, %entry ], [ %inc, %cond.end ]
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%or2 = phi i32 [ 0, %entry ], [ %or, %cond.end ]
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br i1 icmp eq (i32** getelementptr inbounds ([1 x i32*]* @a, i64 0, i64 0), i32** @c), label %cond.false, label %cond.end
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cond.false:
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br label %cond.end
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cond.end:
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%cond = phi i32 [ sdiv (i32 1, i32 zext (i1 icmp eq (i32** getelementptr inbounds ([1 x i32*]* @a, i64 0, i64 0), i32** @c) to i32)), %cond.false ], [ 0, %for.body ]
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%or = or i32 %or2, %cond
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%inc = add nsw i32 %inc3, 1
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%cmp = icmp slt i32 %inc, 128
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br i1 %cmp, label %for.body, label %for.end
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for.end:
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ret i32 %or
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}
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; Neither should we if-convert if there is an instruction operand that is a
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; trapping constant expression.
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; PR16729
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; CHECK-LABEL: trapping_constant_expression2
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; CHECK-NOT: or <4 x i32>
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define i32 @trapping_constant_expression2() {
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entry:
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br label %for.body
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for.body:
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%inc3 = phi i32 [ 0, %entry ], [ %inc, %cond.end ]
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%or2 = phi i32 [ 0, %entry ], [ %or, %cond.end ]
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br i1 icmp eq (i32** getelementptr inbounds ([1 x i32*]* @a, i64 0, i64 0), i32** @c), label %cond.false, label %cond.end
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cond.false:
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%cond.1 = or i32 %inc3, sdiv (i32 1, i32 zext (i1 icmp eq (i32** getelementptr inbounds ([1 x i32*]* @a, i64 0, i64 0), i32** @c) to i32))
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br label %cond.end
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cond.end:
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%cond = phi i32 [ %cond.1, %cond.false ], [ %inc3, %for.body ]
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%or = or i32 %or2, %cond
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%inc = add nsw i32 %inc3, 1
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%cmp = icmp slt i32 %inc, 128
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br i1 %cmp, label %for.body, label %for.end
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for.end:
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ret i32 %or
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}
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