[SystemZ] Utilize Test Data Class instructions.

This adds a new SystemZ-specific intrinsic, llvm.s390.tdc.f(32|64|128),
which maps straight to the test data class instructions.  A new IR pass
is added to recognize instructions that can be converted to TDC and
perform the necessary replacements.

Differential Revision: http://reviews.llvm.org/D21949

llvm-svn: 275016

1 files changed, 139 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/SystemZ/tdc-03.ll b/llvm/test/CodeGen/SystemZ/tdc-03.ll
new file mode 100644
index 00000000000..95708f1effc
--- /dev/null
+++ b/llvm/test/CodeGen/SystemZ/tdc-03.ll
@@ -0,0 +1,139 @@
+; Test the Test Data Class instruction logic operation conversion from
+; compares.
+;
+; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
+
+declare float @llvm.fabs.f32(float)
+declare double @llvm.fabs.f64(double)
+declare fp128 @llvm.fabs.f128(fp128)
+
+; Compare with 0 (unworthy)
+define i32 @f1(float %x) {
+; CHECK-LABEL: f1
+; CHECK-NOT: tceb
+; CHECK: ltebr {{%f[0-9]+}}, %f0
+; CHECK-NOT: tceb
+  %res = fcmp ugt float %x, 0.0
+  %xres = zext i1 %res to i32
+  ret i32 %xres
+}
+
+; Compare fabs with 0 (unworthy)
+define i32 @f2(float %x) {
+; CHECK-LABEL: f2
+; CHECK-NOT: tceb
+; CHECK: lpebr {{%f[0-9]+}}, %f0
+; CHECK-NOT: tceb
+  %y = call float @llvm.fabs.f32(float %x)
+  %res = fcmp ugt float %y, 0.0
+  %xres = zext i1 %res to i32
+  ret i32 %xres
+}
+
+; Compare with inf (unworthy)
+define i32 @f3(float %x) {
+; CHECK-LABEL: f3
+; CHECK-NOT: tceb
+; CHECK: ceb %f0, 0(%r{{[0-9]+}})
+; CHECK-NOT: tceb
+  %res = fcmp ult float %x, 0x7ff0000000000000
+  %xres = zext i1 %res to i32
+  ret i32 %xres
+}
+
+; Compare fabs with inf
+define i32 @f4(float %x) {
+; CHECK-LABEL: f4
+; CHECK: tceb %f0, 4047
+  %y = call float @llvm.fabs.f32(float %x)
+  %res = fcmp ult float %y, 0x7ff0000000000000
+  %xres = zext i1 %res to i32
+  ret i32 %xres
+}
+
+; Compare with minnorm (unworthy)
+define i32 @f5(float %x) {
+; CHECK-LABEL: f5
+; CHECK-NOT: tceb
+; CHECK: ceb %f0, 0(%r{{[0-9]+}})
+; CHECK-NOT: tceb
+  %res = fcmp ult float %x, 0x3810000000000000
+  %xres = zext i1 %res to i32
+  ret i32 %xres
+}
+
+; Compare fabs with minnorm
+define i32 @f6(float %x) {
+; CHECK-LABEL: f6
+; CHECK: tceb %f0, 3279
+  %y = call float @llvm.fabs.f32(float %x)
+  %res = fcmp ult float %y, 0x3810000000000000
+  %xres = zext i1 %res to i32
+  ret i32 %xres
+}
+
+; Compare fabs with minnorm, unsupported condition
+define i32 @f7(float %x) {
+; CHECK-LABEL: f7
+; CHECK-NOT: tceb
+; CHECK: lpdfr [[REG:%f[0-9]+]], %f0
+; CHECK: ceb [[REG]], 0(%r{{[0-9]+}})
+; CHECK-NOT: tceb
+  %y = call float @llvm.fabs.f32(float %x)
+  %res = fcmp ugt float %y, 0x3810000000000000
+  %xres = zext i1 %res to i32
+  ret i32 %xres
+}
+
+; Compare fabs with unsupported constant
+define i32 @f8(float %x) {
+; CHECK-LABEL: f8
+; CHECK-NOT: tceb
+; CHECK: lpdfr [[REG:%f[0-9]+]], %f0
+; CHECK: ceb [[REG]], 0(%r{{[0-9]+}})
+; CHECK-NOT: tceb
+  %y = call float @llvm.fabs.f32(float %x)
+  %res = fcmp ult float %y, 0x3ff0000000000000
+  %xres = zext i1 %res to i32
+  ret i32 %xres
+}
+
+; Compare fabs with minnorm - double
+define i32 @f9(double %x) {
+; CHECK-LABEL: f9
+; CHECK: tcdb %f0, 3279
+  %y = call double @llvm.fabs.f64(double %x)
+  %res = fcmp ult double %y, 0x0010000000000000
+  %xres = zext i1 %res to i32
+  ret i32 %xres
+}
+
+; Compare fabs with minnorm - long double
+define i32 @f10(fp128 %x) {
+; CHECK-LABEL: f10
+; CHECK: tcxb %f0, 3279
+  %y = call fp128 @llvm.fabs.f128(fp128 %x)
+  %res = fcmp ult fp128 %y, 0xL00000000000000000001000000000000
+  %xres = zext i1 %res to i32
+  ret i32 %xres
+}
+
+; Compare fabs for one with inf - clang's isfinite
+define i32 @f11(double %x) {
+; CHECK-LABEL: f11
+; CHECK: tcdb %f0, 4032
+  %y = call double @llvm.fabs.f64(double %x)
+  %res = fcmp one double %y, 0x7ff0000000000000
+  %xres = zext i1 %res to i32
+  ret i32 %xres
+}
+
+; Compare fabs for oeq with inf - clang's isinf
+define i32 @f12(double %x) {
+; CHECK-LABEL: f12
+; CHECK: tcdb %f0, 48
+  %y = call double @llvm.fabs.f64(double %x)
+  %res = fcmp oeq double %y, 0x7ff0000000000000
+  %xres = zext i1 %res to i32
+  ret i32 %xres
+}