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https://github.com/c64scene-ar/llvm-6502.git
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8aa8cea3e9
Partial fix for PR17459: wrong code at -O3 on x86_64-linux-gnu (affecting trunk and 3.3) ScalarEvolutionNormalization was attempting to normalize by adding and subtracting strides. Chained recurrences don't work that way. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193437 91177308-0d34-0410-b5e6-96231b3b80d8
51 lines
1.4 KiB
LLVM
51 lines
1.4 KiB
LLVM
; RUN: opt < %s -analyze -iv-users | FileCheck %s
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; The value of %r is dependent on a polynomial iteration expression.
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;
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; CHECK-LABEL: IV Users for loop %foo.loop
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; CHECK: {1,+,3,+,2}<%foo.loop>
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define i64 @foo(i64 %n) {
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entry:
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br label %foo.loop
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foo.loop:
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%indvar = phi i64 [ 0, %entry ], [ %indvar.next, %foo.loop ]
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%indvar.next = add i64 %indvar, 1
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%c = icmp eq i64 %indvar.next, %n
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br i1 %c, label %exit, label %foo.loop
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exit:
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%r = mul i64 %indvar.next, %indvar.next
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ret i64 %r
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}
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; PR15470: LSR miscompile. The test2 function should return '1'.
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;
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; SCEV does not know how to denormalize chained recurrences, so make
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; sure they aren't marked as post-inc users.
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;
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; CHECK-LABEL: IV Users for loop %test2.loop
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; CHECK: %sext.us = {0,+,(16777216 + (-16777216 * %sub.us)),+,33554432}<%test2.loop> in %f = ashr i32 %sext.us, 24
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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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