[InstCombine] Canonicalize single element array load

[oota-llvm.git] / test / Transforms / InstCombine / sitofp.ll

diff --git a/test/Transforms/InstCombine/sitofp.ll b/test/Transforms/InstCombine/sitofp.ll
index bd31b89f7879afc5c7ae73046c8033c4d6341515..8209778388364f8fb8b8359749ead15ce8306024 100644 (file)
--- a/test/Transforms/InstCombine/sitofp.ll
+++ b/test/Transforms/InstCombine/sitofp.ll
@@ -1,28 +1,40 @@
-; RUN: opt < %s -instcombine -S | not grep itofp
+; RUN: opt < %s -instcombine -S | FileCheck %s
 
+; CHECK-LABEL: test1
+; CHECK: ret i1 true
 define i1 @test1(i8 %A) {
   %B = sitofp i8 %A to double
   %C = fcmp ult double %B, 128.0
-  ret i1 %C  ;  True!
+  ret i1 %C
 }
+
+; CHECK-LABEL: test2
+; CHECK: ret i1 true
 define i1 @test2(i8 %A) {
   %B = sitofp i8 %A to double
   %C = fcmp ugt double %B, -128.1
-  ret i1 %C  ;  True!
+  ret i1 %C
 }
 
+; CHECK-LABEL: test3
+; CHECK: ret i1 true
 define i1 @test3(i8 %A) {
   %B = sitofp i8 %A to double
   %C = fcmp ule double %B, 127.0
-  ret i1 %C  ;  true!
+  ret i1 %C
 }
 
+; CHECK-LABEL: test4
+; CHECK: icmp ne i8 %A, 127
+; CHECK-NEXT: ret i1
 define i1 @test4(i8 %A) {
   %B = sitofp i8 %A to double
   %C = fcmp ult double %B, 127.0
-  ret i1 %C  ;  A != 127
+  ret i1 %C
 }
 
+; CHECK-LABEL: test5
+; CHECK: ret i32
 define i32 @test5(i32 %A) {
   %B = sitofp i32 %A to double
   %C = fptosi double %B to i32
@@ -31,25 +43,142 @@ define i32 @test5(i32 %A) {
   ret i32 %E
 }
 
+; CHECK-LABEL: test6
+; CHECK: and i32 %A, 39
+; CHECK-NEXT: ret i32
 define i32 @test6(i32 %A) {
-       %B = and i32 %A, 7              ; <i32> [#uses=1]
-       %C = and i32 %A, 32             ; <i32> [#uses=1]
-       %D = sitofp i32 %B to double            ; <double> [#uses=1]
-       %E = sitofp i32 %C to double            ; <double> [#uses=1]
-       %F = fadd double %D, %E         ; <double> [#uses=1]
-       %G = fptosi double %F to i32            ; <i32> [#uses=1]
-       ret i32 %G
+  %B = and i32 %A, 7
+  %C = and i32 %A, 32
+  %D = sitofp i32 %B to double
+  %E = sitofp i32 %C to double
+  %F = fadd double %D, %E
+  %G = fptosi double %F to i32
+  ret i32 %G
+}
+
+; CHECK-LABEL: test7
+; CHECK: ret i32
+define i32 @test7(i32 %A) nounwind {
+  %B = sitofp i32 %A to double
+  %C = fptoui double %B to i32
+  ret i32 %C
+}
+
+; CHECK-LABEL: test8
+; CHECK: ret i32
+define i32 @test8(i32 %A) nounwind {
+  %B = uitofp i32 %A to double
+  %C = fptosi double %B to i32
+  ret i32 %C
+}
+
+; CHECK-LABEL: test9
+; CHECK: zext i8
+; CHECK-NEXT: ret i32
+define i32 @test9(i8 %A) nounwind {
+  %B = sitofp i8 %A to float
+  %C = fptoui float %B to i32
+  ret i32 %C
+}
+
+; CHECK-LABEL: test10
+; CHECK: sext i8
+; CHECK-NEXT: ret i32
+define i32 @test10(i8 %A) nounwind {
+  %B = sitofp i8 %A to float
+  %C = fptosi float %B to i32
+  ret i32 %C
+}
+
+; If the input value is outside of the range of the output cast, it's
+; undefined behavior, so we can assume it fits.
+; CHECK-LABEL: test11
+; CHECK: trunc
+; CHECK-NEXT: ret i8
+define i8 @test11(i32 %A) nounwind {
+  %B = sitofp i32 %A to float
+  %C = fptosi float %B to i8
+  ret i8 %C
+}
+
+; If the input value is negative, it'll be outside the range of the
+; output cast, and thus undefined behavior.
+; CHECK-LABEL: test12
+; CHECK: zext i8
+; CHECK-NEXT: ret i32
+define i32 @test12(i8 %A) nounwind {
+  %B = sitofp i8 %A to float
+  %C = fptoui float %B to i32
+  ret i32 %C
+}
+
+; This can't fold because the 25-bit input doesn't fit in the mantissa.
+; CHECK-LABEL: test13
+; CHECK: uitofp
+; CHECK-NEXT: fptoui
+define i32 @test13(i25 %A) nounwind {
+  %B = uitofp i25 %A to float
+  %C = fptoui float %B to i32
+  ret i32 %C
+}
+
+; But this one can.
+; CHECK-LABEL: test14
+; CHECK: zext i24
+; CHECK-NEXT: ret i32
+define i32 @test14(i24 %A) nounwind {
+  %B = uitofp i24 %A to float
+  %C = fptoui float %B to i32
+  ret i32 %C
+}
+
+; And this one can too.
+; CHECK-LABEL: test15
+; CHECK: trunc i32
+; CHECK-NEXT: ret i24
+define i24 @test15(i32 %A) nounwind {
+  %B = uitofp i32 %A to float
+  %C = fptoui float %B to i24
+  ret i24 %C
+}
+
+; This can fold because the 25-bit input is signed and we disard the sign bit.
+; CHECK-LABEL: test16
+; CHECK: zext
+define i32 @test16(i25 %A) nounwind {
+ %B = sitofp i25 %A to float
+ %C = fptoui float %B to i32
+ ret i32 %C
+}
+
+; This can't fold because the 26-bit input won't fit the mantissa
+; even after disarding the signed bit.
+; CHECK-LABEL: test17
+; CHECK: sitofp
+; CHECK-NEXT: fptoui
+define i32 @test17(i26 %A) nounwind {
+ %B = sitofp i26 %A to float
+ %C = fptoui float %B to i32
+ ret i32 %C
 }
 
-define i32 @test7(i32 %a) nounwind {
-       %b = sitofp i32 %a to double            ; <double> [#uses=1]
-       %c = fptoui double %b to i32            ; <i32> [#uses=1]
-       ret i32 %c
+; This can fold because the 54-bit output is signed and we disard the sign bit.
+; CHECK-LABEL: test18
+; CHECK: trunc
+define i54 @test18(i64 %A) nounwind {
+ %B = sitofp i64 %A to double
+ %C = fptosi double %B to i54
+ ret i54 %C
 }
 
-define i32 @test8(i32 %a) nounwind {
-       %b = uitofp i32 %a to double            ; <double> [#uses=1]
-       %c = fptosi double %b to i32            ; <i32> [#uses=1]
-       ret i32 %c
+; This can't fold because the 55-bit output won't fit the mantissa
+; even after disarding the sign bit.
+; CHECK-LABEL: test19
+; CHECK: sitofp
+; CHECK-NEXT: fptosi
+define i55 @test19(i64 %A) nounwind {
+ %B = sitofp i64 %A to double
+ %C = fptosi double %B to i55
+ ret i55 %C
 }