Add support for encoding immediates in icmp and fcmp. Hopefully, this will

remove a fair number of unnecessary materialized constants.
rdar://10412592


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144163 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 214 insertions, 0 deletions

diff --git a/test/CodeGen/ARM/fast-isel-cmp-imm.ll b/test/CodeGen/ARM/fast-isel-cmp-imm.ll
new file mode 100644
index 0000000000..8cb4722671
--- /dev/null
+++ b/test/CodeGen/ARM/fast-isel-cmp-imm.ll
@@ -0,0 +1,214 @@
+; RUN: llc < %s -O0 -fast-isel-abort -relocation-model=dynamic-no-pic -mtriple=armv7-apple-darwin | FileCheck %s --check-prefix=ARM
+; RUN: llc < %s -O0 -fast-isel-abort -relocation-model=dynamic-no-pic -mtriple=thumbv7-apple-darwin | FileCheck %s --check-prefix=THUMB
+
+define void @t1a(float %a) uwtable ssp {
+entry:
+; ARM: t1a
+; THUMB: t1a
+  %cmp = fcmp oeq float %a, 0.000000e+00
+; ARM: vcmpe.f32 s0, #0
+; THUMB: vcmpe.f32 s0, #0
+  br i1 %cmp, label %if.then, label %if.end
+
+if.then:                                          ; preds = %entry
+  tail call void @foo()
+  br label %if.end
+
+if.end:                                           ; preds = %if.then, %entry
+  ret void
+}
+
+declare void @foo()
+
+; Shouldn't be able to encode -0.0 imm.
+define void @t1b(float %a) uwtable ssp {
+entry:
+; ARM: t1b
+; THUMB: t1b
+  %cmp = fcmp oeq float %a, -0.000000e+00
+; ARM: vldr.32
+; ARM: vcmpe.f32 s0, s1
+; THUMB: vldr.32
+; THUMB: vcmpe.f32 s0, s1
+  br i1 %cmp, label %if.then, label %if.end
+
+if.then:                                          ; preds = %entry
+  tail call void @foo()
+  br label %if.end
+
+if.end:                                           ; preds = %if.then, %entry
+  ret void
+}
+
+define void @t2a(double %a) uwtable ssp {
+entry:
+; ARM: t2a
+; THUMB: t2a
+  %cmp = fcmp oeq double %a, 0.000000e+00
+; ARM: vcmpe.f64 d16, #0
+; THUMB: vcmpe.f64 d16, #0
+  br i1 %cmp, label %if.then, label %if.end
+
+if.then:                                          ; preds = %entry
+  tail call void @foo()
+  br label %if.end
+
+if.end:                                           ; preds = %if.then, %entry
+  ret void
+}
+
+; Shouldn't be able to encode -0.0 imm.
+define void @t2b(double %a) uwtable ssp {
+entry:
+; ARM: t2b
+; THUMB: t2b
+  %cmp = fcmp oeq double %a, -0.000000e+00
+; ARM: vldr.64
+; ARM: vcmpe.f64 d16, d17
+; THUMB: vldr.64
+; THUMB: vcmpe.f64 d16, d17
+  br i1 %cmp, label %if.then, label %if.end
+
+if.then:                                          ; preds = %entry
+  tail call void @foo()
+  br label %if.end
+
+if.end:                                           ; preds = %if.then, %entry
+  ret void
+}
+
+define void @t4(i8 signext %a) uwtable ssp {
+entry:
+; ARM: t4
+; THUMB: t4
+  %cmp = icmp eq i8 %a, -1
+; ARM: cmn r0, #1
+; THUMB: cmn.w r0, #1
+  br i1 %cmp, label %if.then, label %if.end
+
+if.then:                                          ; preds = %entry
+  tail call void @foo()
+  br label %if.end
+
+if.end:                                           ; preds = %if.then, %entry
+  ret void
+}
+
+define void @t5(i8 zeroext %a) uwtable ssp {
+entry:
+; ARM: t5
+; THUMB: t5
+  %cmp = icmp eq i8 %a, 1
+; ARM: cmp r0, #1
+; THUMB: cmp r0, #1
+  br i1 %cmp, label %if.then, label %if.end
+
+if.then:                                          ; preds = %entry
+  tail call void @foo()
+  br label %if.end
+
+if.end:                                           ; preds = %if.then, %entry
+  ret void
+}
+
+define void @t6(i16 signext %a) uwtable ssp {
+entry:
+; ARM: t6
+; THUMB: t6
+  %cmp = icmp eq i16 %a, -1
+; ARM: cmn r0, #1
+; THUMB: cmn.w r0, #1
+  br i1 %cmp, label %if.then, label %if.end
+
+if.then:                                          ; preds = %entry
+  tail call void @foo()
+  br label %if.end
+
+if.end:                                           ; preds = %if.then, %entry
+  ret void
+}
+
+define void @t7(i16 zeroext %a) uwtable ssp {
+entry:
+; ARM: t7
+; THUMB: t7
+  %cmp = icmp eq i16 %a, 1
+; ARM: cmp r0, #1
+; THUMB: cmp r0, #1
+  br i1 %cmp, label %if.then, label %if.end
+
+if.then:                                          ; preds = %entry
+  tail call void @foo()
+  br label %if.end
+
+if.end:                                           ; preds = %if.then, %entry
+  ret void
+}
+
+define void @t8(i32 %a) uwtable ssp {
+entry:
+; ARM: t8
+; THUMB: t8
+  %cmp = icmp eq i32 %a, -1
+; ARM: cmn r0, #1
+; THUMB: cmn.w r0, #1
+  br i1 %cmp, label %if.then, label %if.end
+
+if.then:                                          ; preds = %entry
+  tail call void @foo()
+  br label %if.end
+
+if.end:                                           ; preds = %if.then, %entry
+  ret void
+}
+
+define void @t9(i32 %a) uwtable ssp {
+entry:
+; ARM: t9
+; THUMB: t9
+  %cmp = icmp eq i32 %a, 1
+; ARM: cmp r0, #1
+; THUMB: cmp r0, #1
+  br i1 %cmp, label %if.then, label %if.end
+
+if.then:                                          ; preds = %entry
+  tail call void @foo()
+  br label %if.end
+
+if.end:                                           ; preds = %if.then, %entry
+  ret void
+}
+
+define void @t10(i32 %a) uwtable ssp {
+entry:
+; ARM: t10
+; THUMB: t10
+  %cmp = icmp eq i32 %a, 384
+; ARM: cmp r0, #384
+; THUMB: cmp.w r0, #384
+  br i1 %cmp, label %if.then, label %if.end
+
+if.then:                                          ; preds = %entry
+  tail call void @foo()
+  br label %if.end
+
+if.end:                                           ; preds = %if.then, %entry
+  ret void
+}
+
+define void @t11(i32 %a) uwtable ssp {
+entry:
+; ARM: t11
+; THUMB: t11
+  %cmp = icmp eq i32 %a, 4096
+; ARM: cmp r0, #4096
+; THUMB: cmp.w r0, #4096
+  br i1 %cmp, label %if.then, label %if.end
+
+if.then:                                          ; preds = %entry
+  tail call void @foo()
+  br label %if.end
+
+if.end:                                           ; preds = %if.then, %entry
+  ret void
+}