[AArch64] Add some tests for setcc known bits fold. NFC

Author: davemgreen

llvm/test/CodeGen/AArch64/setcc_knownbits.ll

@@ -0,0 +1,84 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 3
+; RUN: llc < %s -mtriple=aarch64-none-eabi | FileCheck %s
+
+define i1 @load_bv_v4i8(i1 zeroext %a) {
+; CHECK-LABEL: load_bv_v4i8:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    cmp w0, #0
+; CHECK-NEXT:    cset w0, ne
+; CHECK-NEXT:    ret
+  %b = zext i1 %a to i32
+  %c = icmp eq i32 %b, 1
+  ret i1 %c
+}
+
+define noundef i1 @logger(i32 noundef %logLevel, ptr %ea, ptr %pll) {
+; CHECK-LABEL: logger:
+; CHECK:       // %bb.0: // %entry
+; CHECK-NEXT:    ldr w8, [x2]
+; CHECK-NEXT:    cmp w8, w0
+; CHECK-NEXT:    b.ls .LBB1_2
+; CHECK-NEXT:  // %bb.1:
+; CHECK-NEXT:    mov w0, wzr
+; CHECK-NEXT:    ret
+; CHECK-NEXT:  .LBB1_2: // %land.rhs
+; CHECK-NEXT:    ldr x8, [x1]
+; CHECK-NEXT:    ldrb w8, [x8]
+; CHECK-NEXT:    cmp w8, #0
+; CHECK-NEXT:    cset w0, ne
+; CHECK-NEXT:    ret
+entry:
+  %0 = load i32, ptr %pll, align 4
+  %cmp.not = icmp ugt i32 %0, %logLevel
+  br i1 %cmp.not, label %land.end, label %land.rhs
+
+land.rhs:                                         ; preds = %entry
+  %1 = load ptr, ptr %ea, align 8
+  %2 = load i8, ptr %1, align 1, !range !14, !noundef !15
+  %tobool.i = icmp ne i8 %2, 0
+  br label %land.end
+
+land.end:                                         ; preds = %land.rhs, %entry
+  %3 = phi i1 [ false, %entry ], [ %tobool.i, %land.rhs ]
+  ret i1 %3
+}
+!14 = !{i8 0, i8 2}
+!15 = !{}
+
+
+declare i64 @llvm.ctlz.i64(i64 %in, i1)
+define i1 @lshr_ctlz_undef_cmpeq_one_i64(i64 %in) {
+; CHECK-LABEL: lshr_ctlz_undef_cmpeq_one_i64:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    clz x8, x0
+; CHECK-NEXT:    lsr x8, x8, #6
+; CHECK-NEXT:    cmp x8, #1
+; CHECK-NEXT:    cset w0, eq
+; CHECK-NEXT:    ret
+  %ctlz = call i64 @llvm.ctlz.i64(i64 %in, i1 -1)
+  %lshr = lshr i64 %ctlz, 6
+  %icmp = icmp eq i64 %lshr, 1
+  ret i1 %icmp
+}
+
+define i32 @PR17487(i1 %tobool) {
+; CHECK-LABEL: PR17487:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    dup v0.2s, w0
+; CHECK-NEXT:    mov w8, #1 // =0x1
+; CHECK-NEXT:    dup v1.2d, x8
+; CHECK-NEXT:    ushll v0.2d, v0.2s, #0
+; CHECK-NEXT:    bic v0.16b, v1.16b, v0.16b
+; CHECK-NEXT:    mov x8, v0.d[1]
+; CHECK-NEXT:    cmp x8, #1
+; CHECK-NEXT:    cset w0, ne
+; CHECK-NEXT:    ret
+  %tmp = insertelement <2 x i1> undef, i1 %tobool, i32 1
+  %tmp1 = zext <2 x i1> %tmp to <2 x i64>
+  %tmp2 = xor <2 x i64> %tmp1, <i64 1, i64 1>
+  %tmp3 = extractelement <2 x i64> %tmp2, i32 1
+  %add = add nsw i64 0, %tmp3
+  %cmp6 = icmp ne i64 %add, 1
+  %conv7 = zext i1 %cmp6 to i32
+  ret i32 %conv7
+}