`crucible-llvm`: support translating `long double`/`x86_fp80` values

The following program:

long double f(long double x) {
  return x;
}

int main() {
  return f(0);
}

Will trip up crux-llvm:

$ crux-llvm test.c 
[Crux] Using pointer width: 64 for file crux-build/crux~test.bc
[Crux] Simulating function main
[Crux] Attempting to prove verification conditions.
[Crux] *** debug executable: results/test/debug-6
[Crux] *** break on line: 6
[Crux] Found counterexample for verification goal
[Crux]   test.c:6:10: error: in main
[Crux]   unsupported LLVM value: ValFP80 (FP80_LongDouble 0 0) of type long double
[Crux] Goal status:
[Crux]   Total: 1
[Crux]   Proved: 0
[Crux]   Disproved: 1
[Crux]   Incomplete: 0
[Crux]   Unknown: 0
[Crux] Overall status: Invalid.

This is the LLVM bitcode produced by Clang 10.0.0:

``` $ cat crux-build/crux~test.ll ; ModuleID = 'crux-build/crux~test.bc' source_filename = "llvm-link" target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128" target triple = "x86_64-pc-linux-gnu" ; Function Attrs: norecurse nounwind readnone uwtable define dso_local x86_fp80 @f(x86_fp80 returned %0) local_unnamed_addr #0 !dbg !7 { call void @llvm.dbg.value(metadata x86_fp80 %0, metadata !12, metadata !DIExpression()), !dbg !13 ret x86_fp80 %0, !dbg !14 } ; Function Attrs: nounwind readnone speculatable willreturn declare void @llvm.dbg.value(metadata, metadata, metadata) #1 ; Function Attrs: norecurse nounwind readnone uwtable define dso_local i32 @main() local_unnamed_addr #0 !dbg !15 { %1 = call x86_fp80 @f(x86_fp80 0xK00000000000000000000), !dbg !19 %2 = fptosi x86_fp80 %1 to i32, !dbg !19 ret i32 %2, !dbg !20 } attributes #0 = { norecurse nounwind readnone uwtable "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "frame-pointer"="none" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" } attributes #1 = { nounwind readnone speculatable willreturn } !llvm.dbg.cu = !{!0} !llvm.ident = !{!3} !llvm.module.flags = !{!4, !5, !6} !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 10.0.0-4ubuntu1 ", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false, nameTableKind: None) !1 = !DIFile(filename: "test.c", directory: "/home/rscott/Documents/Hacking/Haskell/sandbox/crucible/crux-llvm") !2 = !{} !3 = !{!"clang version 10.0.0-4ubuntu1 "} !4 = !{i32 7, !"Dwarf Version", i32 4} !5 = !{i32 2, !"Debug Info Version", i32 3} !6 = !{i32 1, !"wchar_size", i32 4} !7 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 1, type: !8, scopeLine: 1, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !11) !8 = !DISubroutineType(types: !9) !9 = !{!10, !10} !10 = !DIBasicType(name: "long double", size: 128, encoding: DW_ATE_float) !11 = !{!12} !12 = !DILocalVariable(name: "x", arg: 1, scope: !7, file: !1, line: 1, type: !10) !13 = !DILocation(line: 0, scope: !7) !14 = !DILocation(line: 2, column: 3, scope: !7) !15 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 5, type: !16, scopeLine: 5, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !2) !16 = !DISubroutineType(types: !17) !17 = !{!18} !18 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) !19 = !DILocation(line: 6, column: 10, scope: !15) !20 = !DILocation(line: 6, column: 3, scope: !15) ```

I originally discovered this by way of SV-COMP's floats-esbmc-regression/digits_for.c benchmark program.

GaloisInc / crucible

`crucible-llvm`: support translating `long double`/`x86_fp80` values #810