[SCCP] add tests for sitofp; NFC

Adapted from the existing tests for ashr, sdiv, srem.

diff --git a/llvm/test/Transforms/SCCP/sitofp.ll b/llvm/test/Transforms/SCCP/sitofp.ll
new file mode 100644 (file)
index 0000000..b635263
--- /dev/null
+++ b/llvm/test/Transforms/SCCP/sitofp.ll
@@ -0,0 +1,109 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt -passes=ipsccp -S < %s | FileCheck %s
+
+define float @sitofp_and(i8 %x) {
+; CHECK-LABEL: @sitofp_and(
+; CHECK-NEXT:    [[PX:%.*]] = and i8 [[X:%.*]], 127
+; CHECK-NEXT:    [[R:%.*]] = sitofp i8 [[PX]] to float
+; CHECK-NEXT:    ret float [[R]]
+;
+  %px = and i8 %x, 127
+  %r = sitofp i8 %px to float
+  ret float %r
+}
+
+define half @sitofp_const(i8 %x) {
+; CHECK-LABEL: @sitofp_const(
+; CHECK-NEXT:    ret half 0xH5140
+;
+  %r = sitofp i8 42 to half
+  ret half %r
+}
+
+define double @sitofp_zext(i7 %x) {
+; CHECK-LABEL: @sitofp_zext(
+; CHECK-NEXT:    [[PX:%.*]] = zext i7 [[X:%.*]] to i8
+; CHECK-NEXT:    [[R:%.*]] = sitofp i8 [[PX]] to double
+; CHECK-NEXT:    ret double [[R]]
+;
+  %px = zext i7 %x to i8
+  %r = sitofp i8 %px to double
+  ret double %r
+}
+
+; negative test
+
+define double @sitofp_not_nonneg(i7 %x) {
+; CHECK-LABEL: @sitofp_not_nonneg(
+; CHECK-NEXT:    [[PX:%.*]] = sext i7 [[X:%.*]] to i8
+; CHECK-NEXT:    [[R:%.*]] = sitofp i8 [[PX]] to double
+; CHECK-NEXT:    ret double [[R]]
+;
+  %px = sext i7 %x to i8
+  %r = sitofp i8 %px to double
+  ret double %r
+}
+
+; x is known non-negative in t block
+
+define float @dominating_condition(i32 %x) {
+; CHECK-LABEL: @dominating_condition(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[CMP:%.*]] = icmp sge i32 [[X:%.*]], 0
+; CHECK-NEXT:    br i1 [[CMP]], label [[T:%.*]], label [[F:%.*]]
+; CHECK:       t:
+; CHECK-NEXT:    [[A:%.*]] = sitofp i32 [[X]] to float
+; CHECK-NEXT:    br label [[EXIT:%.*]]
+; CHECK:       f:
+; CHECK-NEXT:    br label [[EXIT]]
+; CHECK:       exit:
+; CHECK-NEXT:    [[COND:%.*]] = phi float [ [[A]], [[T]] ], [ 4.200000e+01, [[F]] ]
+; CHECK-NEXT:    ret float [[COND]]
+;
+entry:
+  %cmp = icmp sge i32 %x, 0
+  br i1 %cmp, label %t, label %f
+
+t:
+  %a = sitofp i32 %x to float
+  br label %exit
+
+f:
+  br label %exit
+
+exit:
+  %cond = phi float [ %a, %t ], [ 42.0, %f ]
+  ret float %cond
+}
+
+; x is known non-negative in f block
+
+define float @dominating_condition_alt(i32 %x) {
+; CHECK-LABEL: @dominating_condition_alt(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[CMP:%.*]] = icmp ugt i32 [[X:%.*]], 2000000000
+; CHECK-NEXT:    br i1 [[CMP]], label [[T:%.*]], label [[F:%.*]]
+; CHECK:       t:
+; CHECK-NEXT:    br label [[EXIT:%.*]]
+; CHECK:       f:
+; CHECK-NEXT:    [[A:%.*]] = sitofp i32 [[X]] to float
+; CHECK-NEXT:    br label [[EXIT]]
+; CHECK:       exit:
+; CHECK-NEXT:    [[COND:%.*]] = phi float [ -4.200000e+01, [[T]] ], [ [[A]], [[F]] ]
+; CHECK-NEXT:    ret float [[COND]]
+;
+entry:
+  %cmp = icmp ugt i32 %x, 2000000000
+  br i1 %cmp, label %t, label %f
+
+t:
+  br label %exit
+
+f:
+  %a = sitofp i32 %x to float
+  br label %exit
+
+exit:
+  %cond = phi float [ -42.0, %t ], [ %a, %f ]
+  ret float %cond
+}