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Add support for converting between integer types (#4753)

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Add a builtin `"int.convert"` supporting unchecked conversions between
different integer types. This performs a truncation, zero-extension, or
sign-extension, depending on the widths of the operands and the
signedness of the source type. Add explicit `As` support to the prelude.
No implicit conversions are supported yet as we don't have a way to
express the constraint that we can only implicitly convert to wider
types.
This commit is contained in:
Richard Smith
2025-01-08 08:25:20 +00:00
committed by GitHub
parent 96d836f965
commit 246ec785df
14 changed files with 545 additions and 98 deletions
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toolchain/lower/testdata/function/generic/call_method.carbon
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+2 -2
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@@ -34,7 +34,7 @@ fn CallF() -> i32 {
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(i64 4, ptr %n.var), !dbg !7
// CHECK:STDOUT: store i32 0, ptr %n.var, align 4, !dbg !9
// CHECK:STDOUT: %.loc20_14 = load i32, ptr %n.var, align 4, !dbg !10
// CHECK:STDOUT: %F.call = call i32 @_CF.C.Main.118(ptr %c.var, i32 %.loc20_14), !dbg !11
// CHECK:STDOUT: %F.call = call i32 @_CF.C.Main.129(ptr %c.var, i32 %.loc20_14), !dbg !11
// CHECK:STDOUT: ret i32 %F.call, !dbg !12
// CHECK:STDOUT: }
// CHECK:STDOUT:
@@ -44,7 +44,7 @@ fn CallF() -> i32 {
// CHECK:STDOUT: ; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: readwrite)
// CHECK:STDOUT: declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #1
// CHECK:STDOUT:
// CHECK:STDOUT: declare i32 @_CF.C.Main.118(ptr, i32)
// CHECK:STDOUT: declare i32 @_CF.C.Main.129(ptr, i32)
// CHECK:STDOUT:
// CHECK:STDOUT: ; uselistorder directives
// CHECK:STDOUT: uselistorder ptr @llvm.lifetime.start.p0, { 1, 0 }