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eb30ce19c4
These intrinsics, not the icmp+select are the canonical form nowadays, so we might as well directly emit them. This should not cause any regressions, but if it does, then then they would needed to be fixed regardless. Note that this doesn't deal with `SCEVExpander::isHighCostExpansion()`, but that is a pessimization, not a correctness issue. Additionally, the non-intrinsic form has issues with undef, see https://reviews.llvm.org/D88287#2587863
52 lines
1.7 KiB
LLVM
52 lines
1.7 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -indvars -replexitval=always -S | FileCheck %s
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; Make sure IndVars preserves LCSSA form, especially across loop nests.
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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"
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define void @PR18642(i32 %x) {
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; CHECK-LABEL: @PR18642(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br label [[OUTER_HEADER:%.*]]
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; CHECK: outer.header:
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; CHECK-NEXT: br label [[INNER_HEADER:%.*]]
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; CHECK: inner.header:
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; CHECK-NEXT: br i1 false, label [[INNER_LATCH:%.*]], label [[OUTER_LATCH:%.*]]
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; CHECK: inner.latch:
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; CHECK-NEXT: br i1 true, label [[INNER_HEADER]], label [[EXIT_LOOPEXIT:%.*]]
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; CHECK: outer.latch:
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; CHECK-NEXT: br i1 false, label [[OUTER_HEADER]], label [[EXIT_LOOPEXIT1:%.*]]
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; CHECK: exit.loopexit:
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; CHECK-NEXT: br label [[EXIT:%.*]]
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; CHECK: exit.loopexit1:
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; CHECK-NEXT: br label [[EXIT]]
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; CHECK: exit:
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; CHECK-NEXT: ret void
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;
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entry:
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br label %outer.header
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outer.header:
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%outer.iv = phi i32 [ 0, %entry ], [ %x, %outer.latch ]
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br label %inner.header
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inner.header:
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%inner.iv = phi i32 [ undef, %outer.header ], [ %inc, %inner.latch ]
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%cmp1 = icmp slt i32 %inner.iv, %outer.iv
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br i1 %cmp1, label %inner.latch, label %outer.latch
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inner.latch:
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%inc = add nsw i32 %inner.iv, 1
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%cmp2 = icmp slt i32 %inner.iv, %outer.iv
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br i1 %cmp2, label %inner.header, label %exit
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outer.latch:
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br i1 undef, label %outer.header, label %exit
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exit:
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%exit.phi = phi i32 [ %inc, %inner.latch ], [ undef, %outer.latch ]
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ret void
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}
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