[mips] Improve instruction selection for pattern (store (fp_to_sint $src), $ptr).

Previously, three instructions were needed:

trunc.w.s $f0, $f2
mfc1 $4, $f0
sw $4, 0($2)

Now we need only two:

trunc.w.s $f0, $f2
swc1 $f0, 0($2)


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182053 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 52 insertions, 0 deletions

diff --git a/test/CodeGen/Mips/sint-fp-store_pattern.ll b/test/CodeGen/Mips/sint-fp-store_pattern.ll
new file mode 100644
index 0000000000..23a8aeae91
--- /dev/null
+++ b/test/CodeGen/Mips/sint-fp-store_pattern.ll
@@ -0,0 +1,52 @@
+; RUN: llc -march=mipsel < %s | FileCheck %s -check-prefix=32
+; RUN: llc -march=mips64el -mcpu=mips64 < %s | FileCheck %s -check-prefix=64
+
+@gint_ = external global i32
+@gLL_ = external global i64
+
+; 32: store_int_float_:
+; 32: trunc.w.s $f[[R0:[0-9]+]], $f{{[0-9]+}}
+; 32: swc1 $f[[R0]],
+
+define void @store_int_float_(float %a) {
+entry:
+  %conv = fptosi float %a to i32
+  store i32 %conv, i32* @gint_, align 4
+  ret void
+}
+
+; 32: store_int_double_:
+; 32: trunc.w.d $f[[R0:[0-9]+]], $f{{[0-9]+}}
+; 32: swc1 $f[[R0]],
+; 64: store_int_double_:
+; 64: trunc.w.d $f[[R0:[0-9]+]], $f{{[0-9]+}}
+; 64: swc1 $f[[R0]],
+
+define void @store_int_double_(double %a) {
+entry:
+  %conv = fptosi double %a to i32
+  store i32 %conv, i32* @gint_, align 4
+  ret void
+}
+
+; 64: store_LL_float_:
+; 64: trunc.l.s $f[[R0:[0-9]+]], $f{{[0-9]+}}
+; 64: sdc1 $f[[R0]],
+
+define void @store_LL_float_(float %a) {
+entry:
+  %conv = fptosi float %a to i64
+  store i64 %conv, i64* @gLL_, align 8
+  ret void
+}
+
+; 64: store_LL_double_:
+; 64: trunc.l.d $f[[R0:[0-9]+]], $f{{[0-9]+}}
+; 64: sdc1 $f[[R0]],
+
+define void @store_LL_double_(double %a) {
+entry:
+  %conv = fptosi double %a to i64
+  store i64 %conv, i64* @gLL_, align 8
+  ret void
+}