Bitcasts between FP and INT values using direct moves

This patch corresponds to review:
http://reviews.llvm.org/D15286

This patch was meant to land in revision 255246, but I accidentally uploaded
the patch that corresponds to http://reviews.llvm.org/D15372 in that revision
accidentally.

Thereby, this patch is the actual Bitcasts using direct moves patch, whereas
http://reviews.llvm.org/rL255246 actually corresponds to
http://reviews.llvm.org/D15372.

llvm-svn: 255649

1 files changed, 83 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/PowerPC/bitcasts-direct-move.ll b/llvm/test/CodeGen/PowerPC/bitcasts-direct-move.ll
new file mode 100644
index 00000000000..756f5791754
--- /dev/null
+++ b/llvm/test/CodeGen/PowerPC/bitcasts-direct-move.ll
@@ -0,0 +1,83 @@
+; RUN: llc -mcpu=pwr8 -mtriple=powerpc64-unknown-unknown < %s | FileCheck %s
+; RUN: llc -mcpu=pwr7 -mtriple=powerpc64le-unknown-unknown < %s | FileCheck %s \
+; RUN:  --check-prefix=CHECK-P7
+
+define signext i32 @f32toi32(float %a) {
+entry:
+  %0 = bitcast float %a to i32
+  ret i32 %0
+; CHECK-P7: stfs 1,
+; CHECK-P7: lwa 3,
+; CHECK: xscvdpspn [[CONVREG:[0-9]+]], 1
+; CHECK: xxsldwi [[SHIFTREG:[0-9]+]], [[CONVREG]], [[CONVREG]], 3
+; CHECK: mfvsrwz 3, [[SHIFTREG]]
+}
+
+define i64 @f64toi64(double %a) {
+entry:
+  %0 = bitcast double %a to i64
+  ret i64 %0
+; CHECK-P7: stxsdx 1,
+; CHECK-P7: ld 3,
+; CHECK: mfvsrd 3, 1
+}
+
+define float @i32tof32(i32 signext %a) {
+entry:
+  %0 = bitcast i32 %a to float
+  ret float %0
+; CHECK-P7: stw 3,
+; CHECK-P7: lfs 1,
+; CHECK: mtvsrd [[MOVEREG:[0-9]+]], 3
+; CHECK: xxsldwi [[SHIFTREG:[0-9]+]], [[MOVEREG]], [[MOVEREG]], 1
+; CHECK: xscvspdpn 1, [[SHIFTREG]]
+}
+
+define double @i64tof64(i64 %a) {
+entry:
+  %0 = bitcast i64 %a to double
+  ret double %0
+; CHECK-P7: std 3,
+; CHECK-P7: lxsdx 1,
+; CHECK: mtvsrd 1, 3
+}
+
+define zeroext i32 @f32toi32u(float %a) {
+entry:
+  %0 = bitcast float %a to i32
+  ret i32 %0
+; CHECK-P7: stfs 1,
+; CHECK-P7: lwz 3,
+; CHECK: xscvdpspn [[CONVREG:[0-9]+]], 1
+; CHECK: xxsldwi [[SHIFTREG:[0-9]+]], [[CONVREG]], [[CONVREG]], 3
+; CHECK: mfvsrwz 3, [[SHIFTREG]]
+}
+
+define i64 @f64toi64u(double %a) {
+entry:
+  %0 = bitcast double %a to i64
+  ret i64 %0
+; CHECK-P7: stxsdx 1,
+; CHECK-P7: ld 3,
+; CHECK: mfvsrd 3, 1
+}
+
+define float @i32utof32(i32 zeroext %a) {
+entry:
+  %0 = bitcast i32 %a to float
+  ret float %0
+; CHECK-P7: stw 3,
+; CHECK-P7: lfs 1,
+; CHECK: mtvsrd [[MOVEREG:[0-9]+]], 3
+; CHECK: xxsldwi [[SHIFTREG:[0-9]+]], [[MOVEREG]], [[MOVEREG]], 1
+; CHECK: xscvspdpn 1, [[SHIFTREG]]
+}
+
+define double @i64utof64(i64 %a) {
+entry:
+  %0 = bitcast i64 %a to double
+  ret double %0
+; CHECK-P7: std 3,
+; CHECK-P7: lxsdx 1,
+; CHECK: mtvsrd 1, 3
+}