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ab0a15506d
ConstantFold has logic to take icmp (bitcast x to y), null and strip the bitcast. This makes sense in general, but not if x has floating-point type. In this case, we'd need a fcmp, not an icmp, and the code will assert. We normally don't see this situation because we constant fold fp -> int bitcasts, however, we'll see it for bitcasts of ppc_fp128 -> i128. This is because that bitcast is Endian-dependent, and as a result, we don't simplify it in ConstantFold (we could, but no one has yet added the necessary logic). Regardless, ConstantFold should not depend on that canonicalization for correctness. llvm-svn: 268534
53 lines
1.6 KiB
LLVM
53 lines
1.6 KiB
LLVM
; RUN: opt -S -ipsccp < %s | FileCheck %s
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target datalayout = "E-m:e-i64:64-n32:64"
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target triple = "powerpc64-bgq-linux"
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define void @test(i32 signext %n) {
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; CHECK-LABEL: @test
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entry:
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br i1 undef, label %if.then, label %if.end
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if.then: ; preds = %entry
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ret void
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if.end: ; preds = %entry
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br i1 undef, label %if.then2, label %if.end4
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if.then2: ; preds = %if.end
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unreachable
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if.end4: ; preds = %if.end
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%sub.n = select i1 undef, i32 undef, i32 %n
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switch i32 %sub.n, label %if.else14 [
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i32 0, label %if.then9
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i32 1, label %if.then12
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]
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if.then9: ; preds = %if.end4
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unreachable
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if.then12: ; preds = %if.end4
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unreachable
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if.else14: ; preds = %if.end4
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br label %do.body
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do.body: ; preds = %do.body, %if.else14
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%scale.0 = phi ppc_fp128 [ 0xM3FF00000000000000000000000000000, %if.else14 ], [ %scale.0, %do.body ]
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br i1 undef, label %do.body, label %if.then33
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if.then33: ; preds = %do.body
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br i1 undef, label %_ZN5boost4math4signIgEEiRKT_.exit30, label %cond.false.i28
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cond.false.i28: ; preds = %if.then33
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%0 = bitcast ppc_fp128 %scale.0 to i128
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%tobool.i26 = icmp slt i128 %0, 0
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br label %_ZN5boost4math4signIgEEiRKT_.exit30
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_ZN5boost4math4signIgEEiRKT_.exit30: ; preds = %cond.false.i28, %if.then33
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unreachable
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}
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