//===---------------------------------------------------------------------===//
-SSE4 extract-to-mem ops aren't being pattern matched because of the AssertZext
-sitting between the truncate and the extract.
-
-//===---------------------------------------------------------------------===//
-
INSERTPS can match any insert (extract, imm1), imm2 for 4 x float, and insert
any number of 0.0 simultaneously. Currently we only use it for simple
insertions.
//===---------------------------------------------------------------------===//
-'select' on vectors and scalars could be a whole lot better. We currently
-lower them to conditional branches. On x86-64 for example, we compile this:
-
-double test(double a, double b, double c, double d) { return a<b ? c : d; }
-
-to:
-
-_test:
- ucomisd %xmm0, %xmm1
- ja LBB1_2 # entry
-LBB1_1: # entry
- movapd %xmm3, %xmm2
-LBB1_2: # entry
- movapd %xmm2, %xmm0
- ret
-
-instead of:
-
-_test:
- cmpltsd %xmm1, %xmm0
- andpd %xmm0, %xmm2
- andnpd %xmm3, %xmm0
- orpd %xmm2, %xmm0
- ret
-
-For unpredictable branches, the later is much more efficient. This should
-just be a matter of having scalar sse map to SELECT_CC and custom expanding
-or iseling it.
-
-//===---------------------------------------------------------------------===//
-
LLVM currently generates stack realignment code, when it is not necessary
needed. The problem is that we need to know about stack alignment too early,
before RA runs.
cost of reduced accuracy.
//===---------------------------------------------------------------------===//
+
+This function should be matched to haddpd when the appropriate CPU is enabled:
+
+#include <x86intrin.h>
+double f (__m128d p) {
+ return p[0] + p[1];
+}
+
+similarly, v[0]-v[1] should match to hsubpd, and {v[0]-v[1], w[0]-w[1]} should
+turn into hsubpd also.
+
+//===---------------------------------------------------------------------===//
+
+define <2 x i32> @foo(<2 x double> %in) {
+ %x = fptosi <2 x double> %in to <2 x i32>
+ ret <2 x i32> %x
+}
+
+Should compile into cvttpd2dq instead of being scalarized into 2 cvttsd2si.
+
+//===---------------------------------------------------------------------===//