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7fe3e35aecb2cf2d36ed7a2368dc523f4b2b1ed7
carbon-lang/toolchain/driver/testdata/compile/optimize/optimize_none.carbon
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Richard Smith 7fe3e35aec Support for float <-> int conversions. (#7275) 
Implement support for floating-point <-> integer type conversions as
described in #820 and #845, extended to support `unsafe as` conversions
for the conversions that can't be expressed as either implicit
conversions or `as` conversions.

One tricky part here is conversions from floating-point literals to
integer types. Such literals may have both a very large mantissa and a
corresponding somewhat large negative exponent, and still produce a
result that is in the range of values that a small integer type can
represent. In order to support that while avoiding building very large
2^N or 10^N constants in general, we first compute a conservative
approximation of the number of bits necessary to represent the integer
result, with an early exit if the number is either definitely too large
or definitely zero. The remaining cases have a reasonable bound on the
size of integer necessary to compute the base^exponent multiplicand.

Assisted-by: Gemini via Antigravity
2026-06-03 23:41:20 +00:00

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// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
// Exceptions. See /LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
// ARGS: compile --optimize=none foo.carbon --target=x86_64-unknown-linux-gnu --phase=optimize --dump-llvm-ir --exclude-dump-file-prefix=%{core}
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/driver/testdata/compile/optimize/optimize_none.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/driver/testdata/compile/optimize/optimize_none.carbon
// --- foo.carbon
import Core library "range";
fn Rand() -> i32;
fn NoInlineWithOz() -> i32 {
return Rand() + Rand();
}
fn CallNoInlineWithOptSize() -> i32 {
// Should not be inlined with --optimize=size, because the body is larger than the call.
return NoInlineWithOz();
}
fn VectorizedWithOptSpeed(a: array(i32, 65536)*) {
// Should be vectorized with --optimize=speed, but not in other modes.
var n: i32 = 0;
while (n < 65536) {
(*a)[n] *= 2;
++n;
}
}
// CHECK:STDOUT: ; ModuleID = 'foo.carbon'
// CHECK:STDOUT: source_filename = "foo.carbon"
// CHECK:STDOUT: target triple = "x86_64-unknown-linux-gnu"
// CHECK:STDOUT:
// CHECK:STDOUT: declare i32 @_CRand.Main()
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: noinline nounwind optnone
// CHECK:STDOUT: define i32 @_CNoInlineWithOz.Main() #0 !dbg !4 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %Rand.call.loc7_15 = call i32 @_CRand.Main(), !dbg !8
// CHECK:STDOUT: %Rand.call.loc7_24 = call i32 @_CRand.Main(), !dbg !9
// CHECK:STDOUT: %Int.as.AddWith.impl.Op.call = add i32 %Rand.call.loc7_15, %Rand.call.loc7_24, !dbg !8
// CHECK:STDOUT: ret i32 %Int.as.AddWith.impl.Op.call, !dbg !10
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: noinline nounwind optnone
// CHECK:STDOUT: define i32 @_CCallNoInlineWithOptSize.Main() #0 !dbg !11 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %NoInlineWithOz.call = call i32 @_CNoInlineWithOz.Main(), !dbg !12
// CHECK:STDOUT: ret i32 %NoInlineWithOz.call, !dbg !13
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: noinline nounwind optnone
// CHECK:STDOUT: define void @_CVectorizedWithOptSpeed.Main(ptr %a) #0 !dbg !14 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %n.var = alloca i32, align 4, !dbg !20
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %n.var), !dbg !20
// CHECK:STDOUT: store i32 0, ptr %n.var, align 4, !dbg !20
// CHECK:STDOUT: br label %while.cond, !dbg !21
// CHECK:STDOUT:
// CHECK:STDOUT: while.cond: ; preds = %while.body, %entry
// CHECK:STDOUT: %.loc18_10 = load i32, ptr %n.var, align 4, !dbg !22
// CHECK:STDOUT: %Int.as.OrderedWith.impl.Less.call = icmp slt i32 %.loc18_10, 65536, !dbg !22
// CHECK:STDOUT: br i1 %Int.as.OrderedWith.impl.Less.call, label %while.body, label %while.done, !dbg !21
// CHECK:STDOUT:
// CHECK:STDOUT: while.body: ; preds = %while.cond
// CHECK:STDOUT: %.loc19_10 = load i32, ptr %n.var, align 4, !dbg !23
// CHECK:STDOUT: %.loc19_11.array.index = getelementptr inbounds [65536 x i32], ptr %a, i32 0, i32 %.loc19_10, !dbg !24
// CHECK:STDOUT: %Int.as.MulAssignWith.impl.Op.call = load i32, ptr %.loc19_11.array.index, align 4, !dbg !24
// CHECK:STDOUT: %Int.as.MulAssignWith.impl.Op.call1 = mul i32 %Int.as.MulAssignWith.impl.Op.call, 2, !dbg !24
// CHECK:STDOUT: store i32 %Int.as.MulAssignWith.impl.Op.call1, ptr %.loc19_11.array.index, align 4, !dbg !24
// CHECK:STDOUT: call void @"_COp.Int.9452f4c51951679b.Core:Inc.Core.be1e879c1ad406d8"(ptr %n.var), !dbg !25
// CHECK:STDOUT: br label %while.cond, !dbg !26
// CHECK:STDOUT:
// CHECK:STDOUT: while.done: ; preds = %while.cond
// CHECK:STDOUT: call void @"_COp.1fa36cd3e044ac37:core.Destroy.Core"(ptr %n.var), !dbg !20
// CHECK:STDOUT: ret void, !dbg !27
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: noinline nounwind optnone
// CHECK:STDOUT: define weak_odr void @"_COp.1fa36cd3e044ac37:core.Destroy.Core"(ptr %self) #0 !dbg !28 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !33
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
// CHECK:STDOUT: declare void @llvm.lifetime.start.p0(ptr captures(none)) #1
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: noinline nounwind optnone
// CHECK:STDOUT: define linkonce_odr void @"_COp.Int.9452f4c51951679b.Core:Inc.Core.be1e879c1ad406d8"(ptr %self) #0 !dbg !34 {
// CHECK:STDOUT: call void @"_COp:thunk:AddAssignWith.07875fab836259ed.Core:Int.9452f4c51951679b.Core:AddAssignWith.f8737c9507fb115f.Core.4f441e6d456a6b17"(ptr %self, i32 1), !dbg !38
// CHECK:STDOUT: ret void, !dbg !39
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: noinline nounwind optnone
// CHECK:STDOUT: define linkonce_odr void @"_COp:thunk:AddAssignWith.07875fab836259ed.Core:Int.9452f4c51951679b.Core:AddAssignWith.f8737c9507fb115f.Core.4f441e6d456a6b17"(ptr %self, i32 %other) #0 !dbg !40 {
// CHECK:STDOUT: %1 = call i32 @"_CConvert.667d1d3a0ad99849:ImplicitAs.8b551f392b5250ee.Core.4a088ada889550fc"(i32 %other), !dbg !46
// CHECK:STDOUT: %2 = load i32, ptr %self, align 4, !dbg !47
// CHECK:STDOUT: %3 = add i32 %2, %1, !dbg !47
// CHECK:STDOUT: store i32 %3, ptr %self, align 4, !dbg !47
// CHECK:STDOUT: ret void, !dbg !47
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: noinline nounwind optnone
// CHECK:STDOUT: define linkonce_odr i32 @"_CConvert.667d1d3a0ad99849:ImplicitAs.8b551f392b5250ee.Core.4a088ada889550fc"(i32 %self) #0 !dbg !48 {
// CHECK:STDOUT: %1 = call i32 @"_CAsInt.Int.9452f4c51951679b.Core:AnyInt.Core.be1e879c1ad406d8"(i32 %self), !dbg !53
// CHECK:STDOUT: ret i32 %1, !dbg !54
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: noinline nounwind optnone
// CHECK:STDOUT: define linkonce_odr i32 @"_CAsInt.Int.9452f4c51951679b.Core:AnyInt.Core.be1e879c1ad406d8"(i32 %self) #0 !dbg !55 {
// CHECK:STDOUT: ret i32 %self, !dbg !58
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { noinline nounwind optnone }
// CHECK:STDOUT: attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
// CHECK:STDOUT:
// CHECK:STDOUT: !llvm.module.flags = !{!0, !1}
// CHECK:STDOUT: !llvm.dbg.cu = !{!2}
// CHECK:STDOUT:
// CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
// CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
// CHECK:STDOUT: !2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !3, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !3 = !DIFile(filename: "foo.carbon", directory: "")
// CHECK:STDOUT: !4 = distinct !DISubprogram(name: "NoInlineWithOz", linkageName: "_CNoInlineWithOz.Main", scope: null, file: !3, line: 6, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !5 = !DISubroutineType(types: !6)
// CHECK:STDOUT: !6 = !{!7}
// CHECK:STDOUT: !7 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
// CHECK:STDOUT: !8 = !DILocation(line: 7, column: 10, scope: !4)
// CHECK:STDOUT: !9 = !DILocation(line: 7, column: 19, scope: !4)
// CHECK:STDOUT: !10 = !DILocation(line: 7, column: 3, scope: !4)
// CHECK:STDOUT: !11 = distinct !DISubprogram(name: "CallNoInlineWithOptSize", linkageName: "_CCallNoInlineWithOptSize.Main", scope: null, file: !3, line: 10, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !12 = !DILocation(line: 12, column: 10, scope: !11)
// CHECK:STDOUT: !13 = !DILocation(line: 12, column: 3, scope: !11)
// CHECK:STDOUT: !14 = distinct !DISubprogram(name: "VectorizedWithOptSpeed", linkageName: "_CVectorizedWithOptSpeed.Main", scope: null, file: !3, line: 15, type: !15, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !18)
// CHECK:STDOUT: !15 = !DISubroutineType(types: !16)
// CHECK:STDOUT: !16 = !{null, !17}
// CHECK:STDOUT: !17 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)
// CHECK:STDOUT: !18 = !{!19}
// CHECK:STDOUT: !19 = !DILocalVariable(arg: 1, scope: !14, type: !17)
// CHECK:STDOUT: !20 = !DILocation(line: 17, column: 3, scope: !14)
// CHECK:STDOUT: !21 = !DILocation(line: 18, column: 9, scope: !14)
// CHECK:STDOUT: !22 = !DILocation(line: 18, column: 10, scope: !14)
// CHECK:STDOUT: !23 = !DILocation(line: 19, column: 10, scope: !14)
// CHECK:STDOUT: !24 = !DILocation(line: 19, column: 5, scope: !14)
// CHECK:STDOUT: !25 = !DILocation(line: 20, column: 5, scope: !14)
// CHECK:STDOUT: !26 = !DILocation(line: 18, column: 3, scope: !14)
// CHECK:STDOUT: !27 = !DILocation(line: 15, column: 1, scope: !14)
// CHECK:STDOUT: !28 = distinct !DISubprogram(name: "Op", linkageName: "_COp.1fa36cd3e044ac37:core.Destroy.Core", scope: null, file: !3, line: 17, type: !29, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !31)
// CHECK:STDOUT: !29 = !DISubroutineType(types: !30)
// CHECK:STDOUT: !30 = !{null, !7}
// CHECK:STDOUT: !31 = !{!32}
// CHECK:STDOUT: !32 = !DILocalVariable(arg: 1, scope: !28, type: !7)
// CHECK:STDOUT: !33 = !DILocation(line: 17, column: 3, scope: !28)
// CHECK:STDOUT: !34 = distinct !DISubprogram(name: "Op", linkageName: "_COp.Int.9452f4c51951679b.Core:Inc.Core.be1e879c1ad406d8", scope: null, file: !35, line: 370, type: !29, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !36)
// CHECK:STDOUT: !35 = !DIFile(filename: "{{.*}}/prelude/types/int.carbon", directory: "")
// CHECK:STDOUT: !36 = !{!37}
// CHECK:STDOUT: !37 = !DILocalVariable(arg: 1, scope: !34, type: !7)
// CHECK:STDOUT: !38 = !DILocation(line: 372, column: 5, scope: !34)
// CHECK:STDOUT: !39 = !DILocation(line: 370, column: 3, scope: !34)
// CHECK:STDOUT: !40 = distinct !DISubprogram(name: "Op", linkageName: "_COp:thunk:AddAssignWith.07875fab836259ed.Core:Int.9452f4c51951679b.Core:AddAssignWith.f8737c9507fb115f.Core.4f441e6d456a6b17", scope: null, file: !35, line: 306, type: !41, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !43)
// CHECK:STDOUT: !41 = !DISubroutineType(types: !42)
// CHECK:STDOUT: !42 = !{null, !7, !7}
// CHECK:STDOUT: !43 = !{!44, !45}
// CHECK:STDOUT: !44 = !DILocalVariable(arg: 1, scope: !40, type: !7)
// CHECK:STDOUT: !45 = !DILocalVariable(arg: 2, scope: !40, type: !7)
// CHECK:STDOUT: !46 = !DILocation(line: 4294967295, scope: !40)
// CHECK:STDOUT: !47 = !DILocation(line: 306, column: 3, scope: !40)
// CHECK:STDOUT: !48 = distinct !DISubprogram(name: "Convert", linkageName: "_CConvert.667d1d3a0ad99849:ImplicitAs.8b551f392b5250ee.Core.4a088ada889550fc", scope: null, file: !35, line: 63, type: !49, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !51)
// CHECK:STDOUT: !49 = !DISubroutineType(types: !50)
// CHECK:STDOUT: !50 = !{!7, !7}
// CHECK:STDOUT: !51 = !{!52}
// CHECK:STDOUT: !52 = !DILocalVariable(arg: 1, scope: !48, type: !7)
// CHECK:STDOUT: !53 = !DILocation(line: 65, column: 17, scope: !48)
// CHECK:STDOUT: !54 = !DILocation(line: 65, column: 5, scope: !48)
// CHECK:STDOUT: !55 = distinct !DISubprogram(name: "AsInt", linkageName: "_CAsInt.Int.9452f4c51951679b.Core:AnyInt.Core.be1e879c1ad406d8", scope: null, file: !35, line: 58, type: !49, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !56)
// CHECK:STDOUT: !56 = !{!57}
// CHECK:STDOUT: !57 = !DILocalVariable(arg: 1, scope: !55, type: !7)
// CHECK:STDOUT: !58 = !DILocation(line: 58, column: 36, scope: !55)
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