83 lines
2.8 KiB
LLVM
83 lines
2.8 KiB
LLVM
; RUN: opt < %s -basicaa -gvn -enable-load-pre -S | FileCheck %s
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; RUN: opt < %s -aa-pipeline=basic-aa -passes=gvn -enable-load-pre -S | FileCheck %s
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target datalayout = "e-m:e-i64:64-i128:128-n32:64-S128"
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target triple = "aarch64--linux-gnu"
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define double @foo(i32 %stat, i32 %i, double** %p) {
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; CHECK-LABEL: @foo(
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entry:
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switch i32 %stat, label %sw.default [
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i32 0, label %sw.bb
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i32 1, label %sw.bb
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i32 2, label %sw.bb2
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]
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sw.bb: ; preds = %entry, %entry
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%idxprom = sext i32 %i to i64
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%arrayidx = getelementptr inbounds double*, double** %p, i64 0
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%0 = load double*, double** %arrayidx, align 8
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%arrayidx1 = getelementptr inbounds double, double* %0, i64 %idxprom
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%1 = load double, double* %arrayidx1, align 8
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%sub = fsub double %1, 1.000000e+00
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%cmp = fcmp olt double %sub, 0.000000e+00
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br i1 %cmp, label %if.then, label %if.end
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if.then: ; preds = %sw.bb
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br label %return
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if.end: ; preds = %sw.bb
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br label %sw.bb2
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sw.bb2: ; preds = %if.end, %entry
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%idxprom3 = sext i32 %i to i64
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%arrayidx4 = getelementptr inbounds double*, double** %p, i64 0
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%2 = load double*, double** %arrayidx4, align 8
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%arrayidx5 = getelementptr inbounds double, double* %2, i64 %idxprom3
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%3 = load double, double* %arrayidx5, align 8
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; CHECK: sw.bb2:
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; CHECK-NOT: sext
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; CHECK-NEXT: phi double [
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; CHECK-NOT: load
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%sub6 = fsub double 3.000000e+00, %3
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br label %return
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sw.default: ; preds = %entry
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br label %return
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return: ; preds = %sw.default, %sw.bb2, %if.then
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%retval.0 = phi double [ 0.000000e+00, %sw.default ], [ %sub6, %sw.bb2 ], [ %sub, %if.then ]
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ret double %retval.0
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}
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; The load causes the GEP's operands to be PREd earlier than normal. The
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; resulting sext ends up in pre.dest and in the GVN system before that BB is
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; actually processed. Make sure we can deal with the situation.
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define void @test_shortcut_safe(i1 %tst, i32 %p1, i32* %a) {
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; CHECK-LABEL: define void @test_shortcut_safe
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; CHECK: [[SEXT1:%.*]] = sext i32 %p1 to i64
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; CHECK: [[PHI1:%.*]] = phi i64 [ [[SEXT1]], {{%.*}} ], [ [[PHI2:%.*]], {{%.*}} ]
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; CHECK: [[SEXT2:%.*]] = sext i32 %p1 to i64
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; CHECK: [[PHI2]] = phi i64 [ [[SEXT2]], {{.*}} ], [ [[PHI1]], {{%.*}} ]
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; CHECK: getelementptr inbounds i32, i32* %a, i64 [[PHI2]]
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br i1 %tst, label %sext1, label %pre.dest
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pre.dest:
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br label %sext.use
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sext1:
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%idxprom = sext i32 %p1 to i64
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br label %sext.use
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sext.use:
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%idxprom2 = sext i32 %p1 to i64
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%arrayidx3 = getelementptr inbounds i32, i32* %a, i64 %idxprom2
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%val = load i32, i32* %arrayidx3, align 4
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tail call void (i32) @g(i32 %val)
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br label %pre.dest
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}
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declare void @g(i32)
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