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Assuming the default FP env, we should not treat fdiv and frem any differently in terms of trapping behavior than any other FP op. Ie, FP ops do not trap with the default FP env. This matches how we treat the fdiv/frem in IR with isSafeToSpeculativelyExecute() and in the backend after: https://reviews.llvm.org/rL279970 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@279973 91177308-0d34-0410-b5e6-96231b3b80d8
68 lines
2.1 KiB
LLVM
68 lines
2.1 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -simplifycfg -S | FileCheck %s
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@G = extern_weak global i32
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; PR3354
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; Do not merge bb1 into the entry block, it might trap.
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define i32 @admiral(i32 %a, i32 %b) {
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; CHECK-LABEL: @admiral(
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; CHECK-NEXT: [[C:%.*]] = icmp sle i32 %a, %b
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; CHECK-NEXT: br i1 [[C]], label %bb2, label %bb1
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; CHECK: bb1:
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; CHECK-NEXT: [[D:%.*]] = icmp sgt i32 sdiv (i32 -32768, i32 ptrtoint (i32* @G to i32)), 0
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; CHECK-NEXT: [[DOT:%.*]] = select i1 [[D]], i32 927, i32 42
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; CHECK-NEXT: br label %bb2
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; CHECK: bb2:
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; CHECK-NEXT: [[MERGE:%.*]] = phi i32 [ 42, %0 ], [ [[DOT]], %bb1 ]
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; CHECK-NEXT: ret i32 [[MERGE]]
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;
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%c = icmp sle i32 %a, %b
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br i1 %c, label %bb2, label %bb1
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bb1:
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%d = icmp sgt i32 sdiv (i32 -32768, i32 ptrtoint (i32* @G to i32)), 0
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br i1 %d, label %bb6, label %bb2
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bb2:
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ret i32 42
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bb6:
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ret i32 927
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}
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define i32 @ackbar(i1 %c) {
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; CHECK-LABEL: @ackbar(
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; CHECK-NEXT: br i1 %c, label %bb5, label %bb6
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; CHECK: bb5:
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; CHECK-NEXT: [[DOT:%.*]] = select i1 icmp sgt (i32 sdiv (i32 32767, i32 ptrtoint (i32* @G to i32)), i32 0), i32 42, i32 927
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; CHECK-NEXT: br label %bb6
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; CHECK: bb6:
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; CHECK-NEXT: [[MERGE:%.*]] = phi i32 [ 42, %0 ], [ [[DOT]], %bb5 ]
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; CHECK-NEXT: ret i32 [[MERGE]]
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;
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br i1 %c, label %bb5, label %bb6
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bb5:
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br i1 icmp sgt (i32 sdiv (i32 32767, i32 ptrtoint (i32* @G to i32)), i32 0), label %bb6, label %bb7
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bb6:
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ret i32 42
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bb7:
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ret i32 927
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}
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; FP ops don't trap by default, so this is safe to hoist.
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define i32 @tarp(i1 %c) {
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; CHECK-LABEL: @tarp(
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; CHECK-NEXT: bb9:
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; CHECK-NEXT: [[DOT:%.*]] = select i1 fcmp oeq (float fdiv (float 3.000000e+00, float sitofp (i32 ptrtoint (i32* @G to i32) to float)), float 1.000000e+00), i32 42, i32 927
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; CHECK-NEXT: [[MERGE:%.*]] = select i1 %c, i32 [[DOT]], i32 42
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; CHECK-NEXT: ret i32 [[MERGE]]
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;
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br i1 %c, label %bb8, label %bb9
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bb8:
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br i1 fcmp oeq (float fdiv (float 3.0, float sitofp (i32 ptrtoint (i32* @G to i32) to float)), float 1.0), label %bb9, label %bb10
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bb9:
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ret i32 42
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bb10:
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ret i32 927
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}
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