Rollup merge of #138182 - durin42:llvm-21-fp128-windows, r=tgross35

Zalathar · web-flow · commit 63df6f1200a1 · 2025-04-11T13:31:44.000+10:00
rustc_target: update x86_win64 to match the documented calling convention for f128 llvm/llvm-project@5ee1c0b updates llvm to match the documented calling convention to pass f128 indirectly. This change makes us do that on all versions of LLVM, not just starting with LLVM 21. `@rustbot` label llvm-main try-job: dist-x86_64-msvc try-job: dist-x86_64-mingw try-job: x86_64-msvc-1 try-job: x86_64-msvc-2 try-job: x86_64-mingw-1 try-job: x86_64-mingw-2
diff --git a/tests/assembly/x86_64-windows-float-abi.rs b/tests/assembly/x86_64-windows-float-abi.rs
@@ -37,7 +37,8 @@ pub extern "C" fn second_f64(_: f64, x: f64) -> f64 {
 }
 
 // CHECK-LABEL: second_f128
-// CHECK: movaps %xmm1, %xmm0
+// FIXME(llvm21): this can be just %rdx instead of the regex once we don't test on LLVM 20
+// CHECK: movaps {{(%xmm1|\(%rdx\))}}, %xmm0
 // CHECK-NEXT: retq
 #[no_mangle]
 pub extern "C" fn second_f128(_: f128, x: f128) -> f128 {

Original file line number	Diff line number	Diff line change
`@@ -37,7 +37,8 @@ pub extern "C" fn second_f64(_: f64, x: f64) -> f64 {`
`37`	`37`	`}`
`38`	`38`
`39`	`39`	`// CHECK-LABEL: second_f128`
`40`		`-// CHECK: movaps %xmm1, %xmm0`
	`40`	`+// FIXME(llvm21): this can be just %rdx instead of the regex once we don't test on LLVM 20`
	`41`	`+// CHECK: movaps {{(%xmm1\|\(%rdx\))}}, %xmm0`
`41`	`42`	`// CHECK-NEXT: retq`
`42`	`43`	`#[no_mangle]`
`43`	`44`	`pub extern "C" fn second_f128(_: f128, x: f128) -> f128 {`