[llvm] d0b4ed9 - [ValueTracking] Add tests for knowing `sdiv` is non-zero; NFC

[Noah Goldstein via llvm-commits]

Author: Noah Goldstein
Date: 2023-08-24T19:43:10-05:00
New Revision: d0b4ed9a2cf353eb9f59be344862595af2bd205d

URL: https://github.com/llvm/llvm-project/commit/d0b4ed9a2cf353eb9f59be344862595af2bd205d
DIFF: https://github.com/llvm/llvm-project/commit/d0b4ed9a2cf353eb9f59be344862595af2bd205d.diff

LOG: [ValueTracking] Add tests for knowing `sdiv` is non-zero; NFC

Differential Revision: https://reviews.llvm.org/D157301

Added: 
    

Modified: 
    llvm/test/Analysis/ValueTracking/known-non-zero.ll

Removed: 
    


################################################################################
diff  --git a/llvm/test/Analysis/ValueTracking/known-non-zero.ll b/llvm/test/Analysis/ValueTracking/known-non-zero.ll
index cc77caa29f6996..44b825f64ce951 100644
--- a/llvm/test/Analysis/ValueTracking/known-non-zero.ll
+++ b/llvm/test/Analysis/ValueTracking/known-non-zero.ll
@@ -1122,3 +1122,50 @@ define i1 @src_mul_maybe_zero_no_nonzero_mul(i8 %x, i8 %y) {
   %nz = icmp ne i8 %xy, 0
   ret i1 %nz
 }
+
+define i1 @sdiv_known_non_zero(i8 %x, i8 %y) {
+; CHECK-LABEL: @sdiv_known_non_zero(
+; CHECK-NEXT:    [[XX0:%.*]] = or i8 [[X:%.*]], -121
+; CHECK-NEXT:    [[XX:%.*]] = and i8 [[XX0]], -2
+; CHECK-NEXT:    [[XY:%.*]] = sdiv i8 [[XX]], -2
+; CHECK-NEXT:    [[NZ:%.*]] = icmp ne i8 [[XY]], 0
+; CHECK-NEXT:    ret i1 [[NZ]]
+;
+  %xx0 = or i8 %x, 135
+  %xx = and i8 %xx0, -2
+  %xy = sdiv i8 %xx, -2
+  %nz = icmp ne i8 %xy, 0
+  ret i1 %nz
+}
+
+define i1 @sdiv_known_non_zero2(i8 %x, i8 %y) {
+; CHECK-LABEL: @sdiv_known_non_zero2(
+; CHECK-NEXT:    [[XX0:%.*]] = or i8 [[X:%.*]], 15
+; CHECK-NEXT:    [[XX:%.*]] = and i8 [[XX0]], -4
+; CHECK-NEXT:    [[YY:%.*]] = and i8 [[Y:%.*]], 3
+; CHECK-NEXT:    [[XY:%.*]] = sdiv i8 [[XX]], [[YY]]
+; CHECK-NEXT:    [[NZ:%.*]] = icmp ne i8 [[XY]], 0
+; CHECK-NEXT:    ret i1 [[NZ]]
+;
+  %xx0 = or i8 %x, 15
+  %xx = and i8 %xx0, -4
+  %yy = and i8 %y, 3
+  %xy = sdiv i8 %xx, %yy
+  %nz = icmp ne i8 %xy, 0
+  ret i1 %nz
+}
+
+define i1 @sdiv_known_non_zero_fail(i8 %x, i8 %y) {
+; CHECK-LABEL: @sdiv_known_non_zero_fail(
+; CHECK-NEXT:    [[XX:%.*]] = or i8 [[X:%.*]], 15
+; CHECK-NEXT:    [[YY:%.*]] = and i8 [[Y:%.*]], 3
+; CHECK-NEXT:    [[XY:%.*]] = sdiv i8 [[XX]], [[YY]]
+; CHECK-NEXT:    [[NZ:%.*]] = icmp ne i8 [[XY]], 0
+; CHECK-NEXT:    ret i1 [[NZ]]
+;
+  %xx = or i8 %x, 15
+  %yy = and i8 %y, 3
+  %xy = sdiv i8 %xx, %yy
+  %nz = icmp ne i8 %xy, 0
+  ret i1 %nz
+}