[llvm] [SDAG] Add missing float type legalizations for FMODF (PR #128055)

[Benjamin Maxwell via llvm-commits]

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@@ -376,8 +382,13 @@ define <4 x i32> @test_frexp_v4f32_v4i32_only_use_exp(<4 x float> %a) {
 ; CHECK-NEXT:    mov r1, sp
 ; CHECK-NEXT:    mov r0, r4
 ; CHECK-NEXT:    bl frexpf
-; CHECK-NEXT:    ldrd r1, r0, [sp, #8]
-; CHECK-NEXT:    ldrd r3, r2, [sp], #16
+; CHECK-NEXT:    @ fake_use: $r0
+; CHECK-NEXT:    @ fake_use: $r0
+; CHECK-NEXT:    ldr r0, [sp, #12]
+; CHECK-NEXT:    @ fake_use: $r0
+; CHECK-NEXT:    ldrd r2, r1, [sp, #4]
+; CHECK-NEXT:    @ fake_use: $r0
+; CHECK-NEXT:    ldr r3, [sp], #16
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MacDue wrote:

This is fixed by using the new `CHAIN_BARRIER` node, which does not restrict scheduling :slightly_smiling_face: 

https://github.com/llvm/llvm-project/pull/128055