Imported Upstream version 5.18.0.205

Former-commit-id: 7f59f7e792705db773f1caecdaa823092f4e2927

external/llvm/test/CodeGen/SystemZ/fp-conv-01.ll

@@ -0,0 +1,67 @@
+; Test floating-point truncations.
+;
+; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z10 \
+; RUN:   | FileCheck -check-prefix=CHECK -check-prefix=CHECK-SCALAR %s
+; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z13 \
+; RUN:   | FileCheck -check-prefix=CHECK -check-prefix=CHECK-VECTOR %s
+
+; Test f64->f32.
+define float @f1(double %d1, double %d2) {
+; CHECK-LABEL: f1:
+; CHECK-SCALAR: ledbr %f0, %f2
+; CHECK-VECTOR: ledbra %f0, 0, %f2, 0
+; CHECK: br %r14
+  %res = fptrunc double %d2 to float
+  ret float %res
+}
+
+; Test f128->f32.
+define float @f2(fp128 *%ptr) {
+; CHECK-LABEL: f2:
+; CHECK: lexbr %f0, %f0
+; CHECK: br %r14
+  %val = load fp128 , fp128 *%ptr
+  %res = fptrunc fp128 %val to float
+  ret float %res
+}
+
+; Make sure that we don't use %f0 as the destination of LEXBR when %f2
+; is still live.
+define void @f3(float *%dst, fp128 *%ptr, float %d1, float %d2) {
+; CHECK-LABEL: f3:
+; CHECK: lexbr %f1, %f1
+; CHECK: aebr %f1, %f2
+; CHECK: ste %f1, 0(%r2)
+; CHECK: br %r14
+  %val = load fp128 , fp128 *%ptr
+  %conv = fptrunc fp128 %val to float
+  %res = fadd float %conv, %d2
+  store float %res, float *%dst
+  ret void
+}
+
+; Test f128->f64.
+define double @f4(fp128 *%ptr) {
+; CHECK-LABEL: f4:
+; CHECK: ldxbr %f0, %f0
+; CHECK: br %r14
+  %val = load fp128 , fp128 *%ptr
+  %res = fptrunc fp128 %val to double
+  ret double %res
+}
+
+; Like f3, but for f128->f64.
+define void @f5(double *%dst, fp128 *%ptr, double %d1, double %d2) {
+; CHECK-LABEL: f5:
+; CHECK: ldxbr %f1, %f1
+; CHECK-SCALAR: adbr %f1, %f2
+; CHECK-SCALAR: std %f1, 0(%r2)
+; CHECK-VECTOR: wfadb [[REG:%f[0-9]+]], %f1, %f2
+; CHECK-VECTOR: std [[REG]], 0(%r2)
+; CHECK: br %r14
+  %val = load fp128 , fp128 *%ptr
+  %conv = fptrunc fp128 %val to double
+  %res = fadd double %conv, %d2
+  store double %res, double *%dst
+  ret void
+}