1 files changed, 218 insertions, 0 deletions
diff --git a/llvm/test/Transforms/InstCombine/sitofp.ll b/llvm/test/Transforms/InstCombine/sitofp.ll
new file mode 100644
index 00000000000..149154723b9
--- /dev/null
+++ b/llvm/test/Transforms/InstCombine/sitofp.ll
@@ -0,0 +1,218 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt < %s -instcombine -S | FileCheck %s
+
+define i1 @test1(i8 %A) {
+; CHECK-LABEL: @test1(
+; CHECK-NEXT:    ret i1 true
+;
+  %B = sitofp i8 %A to double
+  %C = fcmp ult double %B, 128.0
+  ret i1 %C
+}
+
+define i1 @test2(i8 %A) {
+; CHECK-LABEL: @test2(
+; CHECK-NEXT:    ret i1 true
+;
+  %B = sitofp i8 %A to double
+  %C = fcmp ugt double %B, -128.1
+  ret i1 %C
+}
+
+define i1 @test3(i8 %A) {
+; CHECK-LABEL: @test3(
+; CHECK-NEXT:    ret i1 true
+;
+  %B = sitofp i8 %A to double
+  %C = fcmp ule double %B, 127.0
+  ret i1 %C
+}
+
+define i1 @test4(i8 %A) {
+; CHECK-LABEL: @test4(
+; CHECK-NEXT:    [[C:%.*]] = icmp ne i8 [[A:%.*]], 127
+; CHECK-NEXT:    ret i1 [[C]]
+;
+  %B = sitofp i8 %A to double
+  %C = fcmp ult double %B, 127.0
+  ret i1 %C
+}
+
+define i32 @test5(i32 %A) {
+; CHECK-LABEL: @test5(
+; CHECK-NEXT:    ret i32 [[A:%.*]]
+;
+  %B = sitofp i32 %A to double
+  %C = fptosi double %B to i32
+  %D = uitofp i32 %C to double
+  %E = fptoui double %D to i32
+  ret i32 %E
+}
+
+define i32 @test6(i32 %A) {
+; CHECK-LABEL: @test6(
+; CHECK-NEXT:    [[ADDCONV:%.*]] = and i32 [[A:%.*]], 39
+; CHECK-NEXT:    ret i32 [[ADDCONV]]
+;
+  %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
+}
+
+define i32 @test7(i32 %A) {
+; CHECK-LABEL: @test7(
+; CHECK-NEXT:    ret i32 [[A:%.*]]
+;
+  %B = sitofp i32 %A to double
+  %C = fptoui double %B to i32
+  ret i32 %C
+}
+
+define i32 @test8(i32 %A) {
+; CHECK-LABEL: @test8(
+; CHECK-NEXT:    ret i32 [[A:%.*]]
+;
+  %B = uitofp i32 %A to double
+  %C = fptosi double %B to i32
+  ret i32 %C
+}
+
+define i32 @test9(i8 %A) {
+; CHECK-LABEL: @test9(
+; CHECK-NEXT:    [[C:%.*]] = zext i8 [[A:%.*]] to i32
+; CHECK-NEXT:    ret i32 [[C]]
+;
+  %B = sitofp i8 %A to float
+  %C = fptoui float %B to i32
+  ret i32 %C
+}
+
+define i32 @test10(i8 %A) {
+; CHECK-LABEL: @test10(
+; CHECK-NEXT:    [[C:%.*]] = sext i8 [[A:%.*]] to i32
+; CHECK-NEXT:    ret i32 [[C]]
+;
+  %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.
+
+define i8 @test11(i32 %A) {
+; CHECK-LABEL: @test11(
+; CHECK-NEXT:    [[C:%.*]] = trunc i32 [[A:%.*]] to i8
+; CHECK-NEXT:    ret i8 [[C]]
+;
+  %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.
+
+define i32 @test12(i8 %A) {
+; CHECK-LABEL: @test12(
+; CHECK-NEXT:    [[C:%.*]] = zext i8 [[A:%.*]] to i32
+; CHECK-NEXT:    ret i32 [[C]]
+;
+  %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.
+
+define i32 @test13(i25 %A) {
+; CHECK-LABEL: @test13(
+; CHECK-NEXT:    [[B:%.*]] = uitofp i25 [[A:%.*]] to float
+; CHECK-NEXT:    [[C:%.*]] = fptoui float [[B]] to i32
+; CHECK-NEXT:    ret i32 [[C]]
+;
+  %B = uitofp i25 %A to float
+  %C = fptoui float %B to i32
+  ret i32 %C
+}
+
+; But this one can.
+
+define i32 @test14(i24 %A) {
+; CHECK-LABEL: @test14(
+; CHECK-NEXT:    [[C:%.*]] = zext i24 [[A:%.*]] to i32
+; CHECK-NEXT:    ret i32 [[C]]
+;
+  %B = uitofp i24 %A to float
+  %C = fptoui float %B to i32
+  ret i32 %C
+}
+
+; And this one can too.
+
+define i24 @test15(i32 %A) {
+; CHECK-LABEL: @test15(
+; CHECK-NEXT:    [[C:%.*]] = trunc i32 [[A:%.*]] to i24
+; CHECK-NEXT:    ret i24 [[C]]
+;
+  %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 discard the sign bit.
+
+define i32 @test16(i25 %A) {
+; CHECK-LABEL: @test16(
+; CHECK-NEXT:    [[C:%.*]] = zext i25 [[A:%.*]] to i32
+; CHECK-NEXT:    ret i32 [[C]]
+;
+  %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 discarding the signed bit.
+
+define i32 @test17(i26 %A) {
+; CHECK-LABEL: @test17(
+; CHECK-NEXT:    [[B:%.*]] = sitofp i26 [[A:%.*]] to float
+; CHECK-NEXT:    [[C:%.*]] = fptoui float [[B]] to i32
+; CHECK-NEXT:    ret i32 [[C]]
+;
+  %B = sitofp i26 %A to float
+  %C = fptoui float %B to i32
+  ret i32 %C
+}
+
+; This can fold because the 54-bit output is signed and we discard the sign bit.
+
+define i54 @test18(i64 %A) {
+; CHECK-LABEL: @test18(
+; CHECK-NEXT:    [[C:%.*]] = trunc i64 [[A:%.*]] to i54
+; CHECK-NEXT:    ret i54 [[C]]
+;
+  %B = sitofp i64 %A to double
+  %C = fptosi double %B to i54
+  ret i54 %C
+}
+
+; This can't fold because the 55-bit output won't fit the mantissa
+; even after discarding the sign bit.
+
+define i55 @test19(i64 %A) {
+; CHECK-LABEL: @test19(
+; CHECK-NEXT:    [[B:%.*]] = sitofp i64 [[A:%.*]] to double
+; CHECK-NEXT:    [[C:%.*]] = fptosi double [[B]] to i55
+; CHECK-NEXT:    ret i55 [[C]]
+;
+  %B = sitofp i64 %A to double
+  %C = fptosi double %B to i55
+  ret i55 %C
+}
+