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https://github.com/c64scene-ar/llvm-6502.git
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ccdb9c9483
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@199016 91177308-0d34-0410-b5e6-96231b3b80d8
43 lines
1.4 KiB
LLVM
43 lines
1.4 KiB
LLVM
; RUN: opt -loop-reduce -S < %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-macosx"
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; PR15470: LSR miscompile. The test2 function should return '1'.
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;
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; SCEV expander cannot expand quadratic recurrences outside of the
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; loop. This recurrence depends on %sub.us, so can't be expanded.
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;
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; CHECK-LABEL: @test2
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; CHECK-LABEL: test2.loop:
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; CHECK: %lsr.iv = phi i32 [ %lsr.iv.next, %test2.loop ], [ -16777216, %entry ]
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; CHECK: %lsr.iv.next = add nsw i32 %lsr.iv, 16777216
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;
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; CHECK-LABEL: for.end:
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; CHECK: %sub.cond.us = sub nsw i32 %inc1115.us, %sub.us
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; CHECK: %sext.us = mul i32 %lsr.iv.next, %sub.cond.us
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; CHECK: %f = ashr i32 %sext.us, 24
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; CHECK: ret i32 %f
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define i32 @test2() {
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entry:
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br label %test2.loop
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test2.loop:
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%inc1115.us = phi i32 [ 0, %entry ], [ %inc11.us, %test2.loop ]
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%inc11.us = add nsw i32 %inc1115.us, 1
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%cmp.us = icmp slt i32 %inc11.us, 2
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br i1 %cmp.us, label %test2.loop, label %for.end
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for.end:
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%tobool.us = icmp eq i32 %inc1115.us, 0
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%sub.us = select i1 %tobool.us, i32 0, i32 0
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%mul.us = shl i32 %inc1115.us, 24
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%sub.cond.us = sub nsw i32 %inc1115.us, %sub.us
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%sext.us = mul i32 %mul.us, %sub.cond.us
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%f = ashr i32 %sext.us, 24
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br label %exit
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exit:
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ret i32 %f
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}
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