compiler_rt: add missing PPC routines

Adds conditional exports
- __fixkfti
- __fixunskfti
- __floattikf
- __negkf2
- __mulkc3
- __divkc3
- __powikf2
and adjusts tools/gen_stubs.zig.

From https://gcc.gnu.org/onlinedocs/gcc/Floating-Types.html:
"When long double transitions to __float128 on PowerPC in the future,
__ibm128 will remain for use in conversions between the two types."

Hence `__extendkftf2` and `__trunctfkf2` for conversion are superfluous
and only using f128 for `kf` routines is justified.

Closes #16057.

lib/compiler_rt/divtc3.zig

@@ -4,7 +4,11 @@ const Complex = @import("./mulc3.zig").Complex;
 
 comptime {
     if (@import("builtin").zig_backend != .stage2_c) {
-        @export(__divtc3, .{ .name = "__divtc3", .linkage = common.linkage, .visibility = common.visibility });
+        if (common.want_ppc_abi) {
+            @export(__divtc3, .{ .name = "__divkc3", .linkage = common.linkage, .visibility = common.visibility });
+        } else {
+            @export(__divtc3, .{ .name = "__divtc3", .linkage = common.linkage, .visibility = common.visibility });
+        }
     }
 }
 

lib/compiler_rt/fixtfti.zig

@@ -7,6 +7,8 @@ pub const panic = common.panic;
 comptime {
     if (common.want_windows_v2u64_abi) {
         @export(__fixtfti_windows_x86_64, .{ .name = "__fixtfti", .linkage = common.linkage, .visibility = common.visibility });
+    } else if (common.want_ppc_abi) {
+        @export(__fixtfti, .{ .name = "__fixkfti", .linkage = common.linkage, .visibility = common.visibility });
     } else {
         @export(__fixtfti, .{ .name = "__fixtfti", .linkage = common.linkage, .visibility = common.visibility });
     }

lib/compiler_rt/fixunstfti.zig

@@ -7,6 +7,8 @@ pub const panic = common.panic;
 comptime {
     if (common.want_windows_v2u64_abi) {
         @export(__fixunstfti_windows_x86_64, .{ .name = "__fixunstfti", .linkage = common.linkage, .visibility = common.visibility });
+    } else if (common.want_ppc_abi) {
+        @export(__fixunstfti, .{ .name = "__fixunskfti", .linkage = common.linkage, .visibility = common.visibility });
     } else {
         @export(__fixunstfti, .{ .name = "__fixunstfti", .linkage = common.linkage, .visibility = common.visibility });
     }

lib/compiler_rt/floattitf.zig

@@ -7,6 +7,8 @@ pub const panic = common.panic;
 comptime {
     if (common.want_windows_v2u64_abi) {
         @export(__floattitf_windows_x86_64, .{ .name = "__floattitf", .linkage = common.linkage, .visibility = common.visibility });
+    } else if (common.want_ppc_abi) {
+        @export(__floattitf, .{ .name = "__floattikf", .linkage = common.linkage, .visibility = common.visibility });
     } else {
         @export(__floattitf, .{ .name = "__floattitf", .linkage = common.linkage, .visibility = common.visibility });
     }

lib/compiler_rt/multc3.zig

@@ -5,7 +5,11 @@ pub const panic = common.panic;
 
 comptime {
     if (@import("builtin").zig_backend != .stage2_c) {
-        @export(__multc3, .{ .name = "__multc3", .linkage = common.linkage, .visibility = common.visibility });
+        if (common.want_ppc_abi) {
+            @export(__multc3, .{ .name = "__mulkc3", .linkage = common.linkage, .visibility = common.visibility });
+        } else {
+            @export(__multc3, .{ .name = "__multc3", .linkage = common.linkage, .visibility = common.visibility });
+        }
     }
 }
 

lib/compiler_rt/negtf2.zig

@@ -3,7 +3,11 @@ const common = @import("./common.zig");
 pub const panic = common.panic;
 
 comptime {
-    @export(__negtf2, .{ .name = "__negtf2", .linkage = common.linkage, .visibility = common.visibility });
+    if (common.want_ppc_abi) {
+        @export(__negtf2, .{ .name = "__negkf2", .linkage = common.linkage, .visibility = common.visibility });
+    } else {
+        @export(__negtf2, .{ .name = "__negtf2", .linkage = common.linkage, .visibility = common.visibility });
+    }
 }
 
 fn __negtf2(a: f128) callconv(.C) f128 {

lib/compiler_rt/powiXf2.zig

@@ -13,7 +13,11 @@ comptime {
     @export(__powihf2, .{ .name = "__powihf2", .linkage = common.linkage, .visibility = common.visibility });
     @export(__powisf2, .{ .name = "__powisf2", .linkage = common.linkage, .visibility = common.visibility });
     @export(__powidf2, .{ .name = "__powidf2", .linkage = common.linkage, .visibility = common.visibility });
-    @export(__powitf2, .{ .name = "__powitf2", .linkage = common.linkage, .visibility = common.visibility });
+    if (common.want_ppc_abi) {
+        @export(__powitf2, .{ .name = "__powikf2", .linkage = common.linkage, .visibility = common.visibility });
+    } else {
+        @export(__powitf2, .{ .name = "__powitf2", .linkage = common.linkage, .visibility = common.visibility });
+    }
     @export(__powixf2, .{ .name = "__powixf2", .linkage = common.linkage, .visibility = common.visibility });
 }
 

tools/gen_stubs.zig

@@ -703,6 +703,7 @@ const blacklisted_symbols = [_][]const u8{
     "__fixdfti",
     "__fixkfdi",
     "__fixkfsi",
+    "__fixkfti",
     "__fixsfdi",
     "__fixsfsi",
     "__fixsfti",
@@ -714,6 +715,7 @@ const blacklisted_symbols = [_][]const u8{
     "__fixunsdfti",
     "__fixunskfdi",
     "__fixunskfsi",
+    "__fixunskfti",
     "__fixunssfdi",
     "__fixunssfsi",
     "__fixunssfti",
@@ -737,6 +739,7 @@ const blacklisted_symbols = [_][]const u8{
     "__floatsitf",
     "__floatsixf",
     "__floattidf",
+    "__floattikf",
     "__floattisf",
     "__floattitf",
     "__floattixf",
@@ -802,6 +805,7 @@ const blacklisted_symbols = [_][]const u8{
     "__muldc3",
     "__muldf3",
     "__muldi3",
+    "__mulkc3",
     "__mulkf3",
     "__mulodi4",
     "__mulosi4",
@@ -835,6 +839,7 @@ const blacklisted_symbols = [_][]const u8{
     "__popcountti2",
     "__powidf2",
     "__powihf2",
+    "__powikf2",
     "__powisf2",
     "__powitf2",
     "__powixf2",