53 lines
1.9 KiB
LLVM
53 lines
1.9 KiB
LLVM
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 2
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; RUN: opt -S -passes='print<scalar-evolution>,indvars' < %s 2>/dev/null | FileCheck %s
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; We should use %invariant.op.us rather than %invariant.op for the exit
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; value expansion. They have the same SCEV, but %invariant.op is more
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; poisonous.
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define i32 @test(i1 %c) {
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; CHECK-LABEL: define i32 @test
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; CHECK-SAME: (i1 [[C:%.*]]) {
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[SEL:%.*]] = select i1 [[C]], i32 33, i32 0
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; CHECK-NEXT: [[SUB_I:%.*]] = add nsw i32 [[SEL]], -68
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; CHECK-NEXT: [[SHL_I:%.*]] = shl nuw nsw i32 1, [[SUB_I]]
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; CHECK-NEXT: [[ADD:%.*]] = add nsw i32 [[SHL_I]], [[SEL]]
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; CHECK-NEXT: [[SEXT:%.*]] = shl i32 [[ADD]], 24
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; CHECK-NEXT: [[CONV2:%.*]] = ashr exact i32 [[SEXT]], 24
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; CHECK-NEXT: [[INVARIANT_OP:%.*]] = sub nsw i32 7, [[CONV2]]
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; CHECK-NEXT: call void @use(i32 [[INVARIANT_OP]])
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; CHECK-NEXT: [[SEXT_US:%.*]] = shl i32 [[SEL]], 24
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; CHECK-NEXT: [[CONV2_US:%.*]] = ashr exact i32 [[SEXT_US]], 24
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; CHECK-NEXT: br label [[LOOP:%.*]]
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; CHECK: loop:
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; CHECK-NEXT: br i1 true, label [[EXIT:%.*]], label [[LOOP]]
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; CHECK: exit:
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; CHECK-NEXT: [[INVARIANT_OP_US:%.*]] = sub nsw i32 7, [[CONV2_US]]
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; CHECK-NEXT: ret i32 [[INVARIANT_OP_US]]
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;
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entry:
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%sel = select i1 %c, i32 33, i32 0
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%sub.i = add nsw i32 %sel, -68
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%shl.i = shl nuw nsw i32 1, %sub.i
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%add = add nsw i32 %shl.i, %sel
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%sext = shl i32 %add, 24
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%conv2 = ashr exact i32 %sext, 24
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%invariant.op = sub nsw i32 7, %conv2
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call void @use(i32 %invariant.op)
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%sext.us = shl i32 %sel, 24
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%conv2.us = ashr exact i32 %sext.us, 24
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%invariant.op.us = sub nsw i32 7, %conv2.us
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br label %loop
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loop:
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%iv = phi i32 [ %iv.next , %loop ], [ 0, %entry ]
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%iv.next = add i32 %iv, 1
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%cmp = icmp eq i32 %iv.next, %invariant.op.us
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br i1 %cmp, label %exit, label %loop
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exit:
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ret i32 %iv.next
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}
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declare void @use(i32)
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