[test] Add missing tests for Arm frexpf128 and Mips ldexpf128 (llvm#148793)

These platforms have tests for the rest of the float sizes but not
`f128`. Add them here.

Author: tgross35

llvm/test/CodeGen/ARM/llvm.frexp.ll

@@ -544,6 +544,59 @@ define <2 x i32> @test_frexp_v2f64_v2i32_only_use_exp(<2 x double> %a) {
   ret <2 x i32> %result.1
 }
 
+define { fp128, i32 } @test_frexp_f128_i32(fp128 %a) nounwind {
+; CHECK-LABEL: test_frexp_f128_i32:
+; CHECK:       @ %bb.0:
+; CHECK-NEXT:    push {r4, lr}
+; CHECK-NEXT:    sub sp, #8
+; CHECK-NEXT:    mov r12, r3
+; CHECK-NEXT:    ldr r3, [sp, #16]
+; CHECK-NEXT:    mov r4, r0
+; CHECK-NEXT:    add r0, sp, #4
+; CHECK-NEXT:    str r0, [sp]
+; CHECK-NEXT:    mov r0, r1
+; CHECK-NEXT:    mov r1, r2
+; CHECK-NEXT:    mov r2, r12
+; CHECK-NEXT:    bl frexpl
+; CHECK-NEXT:    ldr.w r12, [sp, #4]
+; CHECK-NEXT:    stm.w r4, {r0, r1, r2, r3, r12}
+; CHECK-NEXT:    add sp, #8
+; CHECK-NEXT:    pop {r4, pc}
+  %result = call { fp128, i32 } @llvm.frexp.f128.i32(fp128 %a)
+  ret { fp128, i32 } %result
+}
+
+define fp128 @test_frexp_f128_i32_only_use_fract(fp128 %a) nounwind {
+; CHECK-LABEL: test_frexp_f128_i32_only_use_fract:
+; CHECK:       @ %bb.0:
+; CHECK-NEXT:    push {r7, lr}
+; CHECK-NEXT:    sub sp, #8
+; CHECK-NEXT:    add.w r12, sp, #4
+; CHECK-NEXT:    str.w r12, [sp]
+; CHECK-NEXT:    bl frexpl
+; CHECK-NEXT:    add sp, #8
+; CHECK-NEXT:    pop {r7, pc}
+  %result = call { fp128, i32 } @llvm.frexp.f128.i32(fp128 %a)
+  %result.0 = extractvalue { fp128, i32 } %result, 0
+  ret fp128 %result.0
+}
+
+define i32 @test_frexp_f128_i32_only_use_exp(fp128 %a) nounwind {
+; CHECK-LABEL: test_frexp_f128_i32_only_use_exp:
+; CHECK:       @ %bb.0:
+; CHECK-NEXT:    push {r7, lr}
+; CHECK-NEXT:    sub sp, #8
+; CHECK-NEXT:    add.w r12, sp, #4
+; CHECK-NEXT:    str.w r12, [sp]
+; CHECK-NEXT:    bl frexpl
+; CHECK-NEXT:    ldr r0, [sp, #4]
+; CHECK-NEXT:    add sp, #8
+; CHECK-NEXT:    pop {r7, pc}
+  %result = call { fp128, i32 } @llvm.frexp.f128.i32(fp128 %a)
+  %result.0 = extractvalue { fp128, i32 } %result, 1
+  ret i32 %result.0
+}
+
 declare { float, i32 } @llvm.frexp.f32.i32(float) #0
 declare { <2 x float>, <2 x i32> } @llvm.frexp.v2f32.v2i32(<2 x float>) #0
 declare { <4 x float>, <4 x i32> } @llvm.frexp.v4f32.v4i32(<4 x float>) #0

llvm/test/CodeGen/Mips/ldexp.ll

@@ -125,6 +125,21 @@ define half @ldexp_f16(half %arg0, i32 %arg1) nounwind {
   ret half %ldexp
 }
 
+define fp128 @ldexp_f128(fp128 %arg0, i32 %arg1) nounwind {
+; SOFT-LABEL: ldexp_f128:
+; SOFT:       # %bb.0:
+; SOFT-NEXT:    addiu $sp, $sp, -32
+; SOFT-NEXT:    sw $ra, 28($sp) # 4-byte Folded Spill
+; SOFT-NEXT:    lw $1, 48($sp)
+; SOFT-NEXT:    jal ldexpl
+; SOFT-NEXT:    sw $1, 16($sp)
+; SOFT-NEXT:    lw $ra, 28($sp) # 4-byte Folded Reload
+; SOFT-NEXT:    jr $ra
+; SOFT-NEXT:    addiu $sp, $sp, 32
+  %ldexp = call fp128 @llvm.ldexp.f128.i32(fp128 %arg0, i32 %arg1)
+  ret fp128 %ldexp
+}
+
 declare double @llvm.ldexp.f64.i32(double, i32) #0
 declare float @llvm.ldexp.f32.i32(float, i32) #0
 declare <2 x float> @llvm.ldexp.v2f32.v2i32(<2 x float>, <2 x i32>) #0