1 files changed, 67 insertions, 0 deletions
diff --git a/test/CodeGen/X86/x86-64-double-shifts-Oz-Os-O2.ll b/test/CodeGen/X86/x86-64-double-shifts-Oz-Os-O2.ll
new file mode 100644
index 0000000..5d7a10b
--- /dev/null
+++ b/test/CodeGen/X86/x86-64-double-shifts-Oz-Os-O2.ll
@@ -0,0 +1,67 @@
+; RUN: llc < %s -march=x86-64 -mcpu=bdver1 | FileCheck %s
+
+; clang -Oz -c test1.cpp -emit-llvm -S -o
+; Verify that we generate shld insruction when we are optimizing for size,
+; even for X86_64 processors that are known to have poor latency double 
+; precision shift instuctions.
+; uint64_t lshift10(uint64_t a, uint64_t b)
+; {
+;     return (a << 10) | (b >> 54);
+; }
+
+; Function Attrs: minsize nounwind optsize readnone uwtable
+define i64 @_Z8lshift10mm(i64 %a, i64 %b) #0 {
+entry:
+; CHECK:   shldq   $10
+  %shl = shl i64 %a, 10
+  %shr = lshr i64 %b, 54
+  %or = or i64 %shr, %shl
+  ret i64 %or
+}
+
+attributes #0 = { minsize nounwind optsize readnone uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
+
+
+; clang -Os -c test2.cpp -emit-llvm -S
+; Verify that we generate shld insruction when we are optimizing for size,
+; even for X86_64 processors that are known to have poor latency double
+; precision shift instuctions.
+; uint64_t lshift11(uint64_t a, uint64_t b)
+; {
+;     return (a << 11) | (b >> 53);
+; }
+
+; Function Attrs: nounwind optsize readnone uwtable
+define i64 @_Z8lshift11mm(i64 %a, i64 %b) #1 {
+entry:
+; CHECK:   shldq   $11
+  %shl = shl i64 %a, 11
+  %shr = lshr i64 %b, 53
+  %or = or i64 %shr, %shl
+  ret i64 %or
+}
+
+attributes #1 = { nounwind optsize readnone uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
+
+; clang -O2 -c test2.cpp -emit-llvm -S
+; Verify that we do not generate shld insruction when we are not optimizing
+; for size for X86_64 processors that are known to have poor latency double
+; precision shift instuctions.
+; uint64_t lshift12(uint64_t a, uint64_t b)
+; {
+;     return (a << 12) | (b >> 52);
+; }
+
+; Function Attrs: nounwind optsize readnone uwtable
+define i64 @_Z8lshift12mm(i64 %a, i64 %b) #2 {
+entry:
+; CHECK:       shlq    $12
+; CHECK-NEXT:  shrq    $52
+  %shl = shl i64 %a, 12
+  %shr = lshr i64 %b, 52
+  %or = or i64 %shr, %shl
+  ret i64 %or
+}
+
+attributes #2= { nounwind readnone uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
+