[llvm] [InstSimplify] Add basic constant folding for `llvm.sincos` (PR #114527)

[Matt Arsenault via llvm-commits]

================
@@ -0,0 +1,148 @@
+; RUN: opt -S -passes=instsimplify %s | FileCheck %s
+
+define { float, float } @sincos_zero() {
+; CHECK-LABEL: define { float, float } @sincos_zero() {
+; CHECK-NEXT:    ret { float, float } { float 0.000000e+00, float 1.000000e+00 }
+;
+  %ret = call { float, float } @llvm.sincos.f32(float zeroinitializer)
+  ret { float, float } %ret
+}
+
+define { float, float } @sincos_neg_zero() {
+; CHECK-LABEL: define { float, float } @sincos_neg_zero() {
+; CHECK-NEXT:    ret { float, float } { float -0.000000e+00, float 1.000000e+00 }
+;
+  %ret = call { float, float } @llvm.sincos.f32(float -0.0)
+  ret { float, float } %ret
+}
+
+define { float, float } @sincos_one() {
+; CHECK-LABEL: define { float, float } @sincos_one() {
+; CHECK-NEXT:    ret { float, float } { float [[$SIN_ONE:.+]], float [[$COS_ONE:.+]] }
+;
+  %ret = call { float, float } @llvm.sincos.f32(float 1.0)
+  ret { float, float } %ret
+}
+
+define { float, float } @sincos_two() {
+; CHECK-LABEL: define { float, float } @sincos_two() {
+; CHECK-NEXT:    ret { float, float } { float [[$SIN_TWO:.+]], float [[$COS_TWO:.+]] }
+;
+  %ret = call { float, float } @llvm.sincos.f32(float 2.0)
+  ret { float, float } %ret
+}
+
+define { <2 x float>, <2 x float> } @sincos_vector() {
+; CHECK-LABEL: define { <2 x float>, <2 x float> } @sincos_vector() {
+; CHECK-NEXT:    ret { <2 x float>, <2 x float> } { <2 x float> <float [[$SIN_ONE]], float [[$SIN_TWO]]>, <2 x float> <float [[$COS_ONE]], float [[$COS_TWO]]> }
+;
+  %ret = call { <2 x float>, <2 x float> } @llvm.sincos.v2f32(<2 x float> <float 1.0, float 2.0>)
+  ret { <2 x float>, <2 x float> } %ret
+}
+
+define { <2 x float>, <2 x float> } @sincos_zero_vector() {
+; CHECK-LABEL: define { <2 x float>, <2 x float> } @sincos_zero_vector() {
+; CHECK-NEXT:    ret { <2 x float>, <2 x float> } { <2 x float> zeroinitializer, <2 x float> <float 1.000000e+00, float 1.000000e+00> }
+;
+  %ret = call { <2 x float>, <2 x float> } @llvm.sincos.v2f32(<2 x float> zeroinitializer)
+  ret { <2 x float>, <2 x float> } %ret
+}
+
+define { float, float } @sincos_poison() {
+; CHECK-LABEL: define { float, float } @sincos_poison() {
+; CHECK-NEXT:    [[RET:%.*]] = call { float, float } @llvm.sincos.f32(float poison)
+; CHECK-NEXT:    ret { float, float } [[RET]]
+;
+  %ret = call { float, float } @llvm.sincos.f32(float poison)
+  ret { float, float } %ret
+}
+
+define { <2 x float>, <2 x float> } @sincos_poison_vector() {
+; CHECK-LABEL: define { <2 x float>, <2 x float> } @sincos_poison_vector() {
+; CHECK-NEXT:    [[RET:%.*]] = call { <2 x float>, <2 x float> } @llvm.sincos.v2f32(<2 x float> poison)
+; CHECK-NEXT:    ret { <2 x float>, <2 x float> } [[RET]]
+;
+  %ret = call { <2 x float>, <2 x float> } @llvm.sincos.v2f32(<2 x float> poison)
+  ret { <2 x float>, <2 x float> } %ret
+}
+
+define { <vscale x 2 x float>, <vscale x 2 x float> } @sincos_poison_scalable_vector() {
+; CHECK-LABEL: define { <vscale x 2 x float>, <vscale x 2 x float> } @sincos_poison_scalable_vector() {
+; CHECK-NEXT:    [[RET:%.*]] = call { <vscale x 2 x float>, <vscale x 2 x float> } @llvm.sincos.nxv2f32(<vscale x 2 x float> poison)
+; CHECK-NEXT:    ret { <vscale x 2 x float>, <vscale x 2 x float> } [[RET]]
+;
+  %ret = call { <vscale x 2 x float>, <vscale x 2 x float> } @llvm.sincos.nxv2f32(<vscale x 2 x float> poison)
+  ret { <vscale x 2 x float>, <vscale x 2 x float> } %ret
+}
+
+define { float, float } @sincos_undef() {
+; CHECK-LABEL: define { float, float } @sincos_undef() {
+; CHECK-NEXT:    [[RET:%.*]] = call { float, float } @llvm.sincos.f32(float undef)
+; CHECK-NEXT:    ret { float, float } [[RET]]
+;
+  %ret = call { float, float } @llvm.sincos.f32(float undef)
+  ret { float, float } %ret
+}
+
+define { <2 x float>, <2 x float> } @sincos_undef_vector() {
+; CHECK-LABEL: define { <2 x float>, <2 x float> } @sincos_undef_vector() {
+; CHECK-NEXT:    [[RET:%.*]] = call { <2 x float>, <2 x float> } @llvm.sincos.v2f32(<2 x float> undef)
+; CHECK-NEXT:    ret { <2 x float>, <2 x float> } [[RET]]
+;
+  %ret = call { <2 x float>, <2 x float> } @llvm.sincos.v2f32(<2 x float> undef)
+  ret { <2 x float>, <2 x float> } %ret
+}
+
+define { <vscale x 2 x float>, <vscale x 2 x float> } @sincos_undef_scalable_vector() {
+; CHECK-LABEL: define { <vscale x 2 x float>, <vscale x 2 x float> } @sincos_undef_scalable_vector() {
+; CHECK-NEXT:    [[RET:%.*]] = call { <vscale x 2 x float>, <vscale x 2 x float> } @llvm.sincos.nxv2f32(<vscale x 2 x float> undef)
+; CHECK-NEXT:    ret { <vscale x 2 x float>, <vscale x 2 x float> } [[RET]]
+;
+  %ret = call { <vscale x 2 x float>, <vscale x 2 x float> } @llvm.sincos.nxv2f32(<vscale x 2 x float> undef)
+  ret { <vscale x 2 x float>, <vscale x 2 x float> } %ret
+}
+
+define { <vscale x 2 x float>, <vscale x 2 x float> } @sincos_zero_scalable_vector() {
+; CHECK-LABEL: define { <vscale x 2 x float>, <vscale x 2 x float> } @sincos_zero_scalable_vector() {
+; CHECK-NEXT:    [[RET:%.*]] = call { <vscale x 2 x float>, <vscale x 2 x float> } @llvm.sincos.nxv2f32(<vscale x 2 x float> zeroinitializer)
+; CHECK-NEXT:    ret { <vscale x 2 x float>, <vscale x 2 x float> } [[RET]]
+;
+  %ret = call { <vscale x 2 x float>, <vscale x 2 x float> } @llvm.sincos.nxv2f32(<vscale x 2 x float> zeroinitializer)
+  ret { <vscale x 2 x float>, <vscale x 2 x float> } %ret
+}
----------------
arsenm wrote:

In a follow up, should probably make sure the zero, undef, and splat cases work for scalable vectors 

https://github.com/llvm/llvm-project/pull/114527