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diff --git a/test/Transforms/InstCombine/and.ll b/test/Transforms/InstCombine/and.ll
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+; This test makes sure that these instructions are properly eliminated.
+;
+
+; RUN: opt < %s -instcombine -S | not grep and
+
+define i32 @test1(i32 %A) {
+ ; zero result
+ %B = and i32 %A, 0 ; <i32> [#uses=1]
+ ret i32 %B
+}
+
+define i32 @test2(i32 %A) {
+ ; noop
+ %B = and i32 %A, -1 ; <i32> [#uses=1]
+ ret i32 %B
+}
+
+define i1 @test3(i1 %A) {
+ ; always = false
+ %B = and i1 %A, false ; <i1> [#uses=1]
+ ret i1 %B
+}
+
+define i1 @test4(i1 %A) {
+ ; noop
+ %B = and i1 %A, true ; <i1> [#uses=1]
+ ret i1 %B
+}
+
+define i32 @test5(i32 %A) {
+ %B = and i32 %A, %A ; <i32> [#uses=1]
+ ret i32 %B
+}
+
+define i1 @test6(i1 %A) {
+ %B = and i1 %A, %A ; <i1> [#uses=1]
+ ret i1 %B
+}
+
+; A & ~A == 0
+define i32 @test7(i32 %A) {
+ %NotA = xor i32 %A, -1 ; <i32> [#uses=1]
+ %B = and i32 %A, %NotA ; <i32> [#uses=1]
+ ret i32 %B
+}
+
+; AND associates
+define i8 @test8(i8 %A) {
+ %B = and i8 %A, 3 ; <i8> [#uses=1]
+ %C = and i8 %B, 4 ; <i8> [#uses=1]
+ ret i8 %C
+}
+
+define i1 @test9(i32 %A) {
+ ; Test of sign bit, convert to setle %A, 0
+ %B = and i32 %A, -2147483648 ; <i32> [#uses=1]
+ %C = icmp ne i32 %B, 0 ; <i1> [#uses=1]
+ ret i1 %C
+}
+
+define i1 @test9a(i32 %A) {
+ ; Test of sign bit, convert to setle %A, 0
+ %B = and i32 %A, -2147483648 ; <i32> [#uses=1]
+ %C = icmp ne i32 %B, 0 ; <i1> [#uses=1]
+ ret i1 %C
+}
+
+define i32 @test10(i32 %A) {
+ %B = and i32 %A, 12 ; <i32> [#uses=1]
+ %C = xor i32 %B, 15 ; <i32> [#uses=1]
+ ; (X ^ C1) & C2 --> (X & C2) ^ (C1&C2)
+ %D = and i32 %C, 1 ; <i32> [#uses=1]
+ ret i32 %D
+}
+
+define i32 @test11(i32 %A, i32* %P) {
+ %B = or i32 %A, 3 ; <i32> [#uses=1]
+ %C = xor i32 %B, 12 ; <i32> [#uses=2]
+ ; additional use of C
+ store i32 %C, i32* %P
+ ; %C = and uint %B, 3 --> 3
+ %D = and i32 %C, 3 ; <i32> [#uses=1]
+ ret i32 %D
+}
+
+define i1 @test12(i32 %A, i32 %B) {
+ %C1 = icmp ult i32 %A, %B ; <i1> [#uses=1]
+ %C2 = icmp ule i32 %A, %B ; <i1> [#uses=1]
+ ; (A < B) & (A <= B) === (A < B)
+ %D = and i1 %C1, %C2 ; <i1> [#uses=1]
+ ret i1 %D
+}
+
+define i1 @test13(i32 %A, i32 %B) {
+ %C1 = icmp ult i32 %A, %B ; <i1> [#uses=1]
+ %C2 = icmp ugt i32 %A, %B ; <i1> [#uses=1]
+ ; (A < B) & (A > B) === false
+ %D = and i1 %C1, %C2 ; <i1> [#uses=1]
+ ret i1 %D
+}
+
+define i1 @test14(i8 %A) {
+ %B = and i8 %A, -128 ; <i8> [#uses=1]
+ %C = icmp ne i8 %B, 0 ; <i1> [#uses=1]
+ ret i1 %C
+}
+
+define i8 @test15(i8 %A) {
+ %B = lshr i8 %A, 7 ; <i8> [#uses=1]
+ ; Always equals zero
+ %C = and i8 %B, 2 ; <i8> [#uses=1]
+ ret i8 %C
+}
+
+define i8 @test16(i8 %A) {
+ %B = shl i8 %A, 2 ; <i8> [#uses=1]
+ %C = and i8 %B, 3 ; <i8> [#uses=1]
+ ret i8 %C
+}
+
+;; ~(~X & Y) --> (X | ~Y)
+define i8 @test17(i8 %X, i8 %Y) {
+ %B = xor i8 %X, -1 ; <i8> [#uses=1]
+ %C = and i8 %B, %Y ; <i8> [#uses=1]
+ %D = xor i8 %C, -1 ; <i8> [#uses=1]
+ ret i8 %D
+}
+
+define i1 @test18(i32 %A) {
+ %B = and i32 %A, -128 ; <i32> [#uses=1]
+ ;; C >= 128
+ %C = icmp ne i32 %B, 0 ; <i1> [#uses=1]
+ ret i1 %C
+}
+
+define i1 @test18a(i8 %A) {
+ %B = and i8 %A, -2 ; <i8> [#uses=1]
+ %C = icmp eq i8 %B, 0 ; <i1> [#uses=1]
+ ret i1 %C
+}
+
+define i32 @test19(i32 %A) {
+ %B = shl i32 %A, 3 ; <i32> [#uses=1]
+ ;; Clearing a zero bit
+ %C = and i32 %B, -2 ; <i32> [#uses=1]
+ ret i32 %C
+}
+
+define i8 @test20(i8 %A) {
+ %C = lshr i8 %A, 7 ; <i8> [#uses=1]
+ ;; Unneeded
+ %D = and i8 %C, 1 ; <i8> [#uses=1]
+ ret i8 %D
+}
+
+define i1 @test22(i32 %A) {
+ %B = icmp eq i32 %A, 1 ; <i1> [#uses=1]
+ %C = icmp sge i32 %A, 3 ; <i1> [#uses=1]
+ ;; false
+ %D = and i1 %B, %C ; <i1> [#uses=1]
+ ret i1 %D
+}
+
+define i1 @test23(i32 %A) {
+ %B = icmp sgt i32 %A, 1 ; <i1> [#uses=1]
+ %C = icmp sle i32 %A, 2 ; <i1> [#uses=1]
+ ;; A == 2
+ %D = and i1 %B, %C ; <i1> [#uses=1]
+ ret i1 %D
+}
+
+define i1 @test24(i32 %A) {
+ %B = icmp sgt i32 %A, 1 ; <i1> [#uses=1]
+ %C = icmp ne i32 %A, 2 ; <i1> [#uses=1]
+ ;; A > 2
+ %D = and i1 %B, %C ; <i1> [#uses=1]
+ ret i1 %D
+}
+
+define i1 @test25(i32 %A) {
+ %B = icmp sge i32 %A, 50 ; <i1> [#uses=1]
+ %C = icmp slt i32 %A, 100 ; <i1> [#uses=1]
+ ;; (A-50) <u 50
+ %D = and i1 %B, %C ; <i1> [#uses=1]
+ ret i1 %D
+}
+
+define i1 @test26(i32 %A) {
+ %B = icmp ne i32 %A, 50 ; <i1> [#uses=1]
+ %C = icmp ne i32 %A, 51 ; <i1> [#uses=1]
+ ;; (A-50) > 1
+ %D = and i1 %B, %C ; <i1> [#uses=1]
+ ret i1 %D
+}
+
+define i8 @test27(i8 %A) {
+ %B = and i8 %A, 4 ; <i8> [#uses=1]
+ %C = sub i8 %B, 16 ; <i8> [#uses=1]
+ ;; 0xF0
+ %D = and i8 %C, -16 ; <i8> [#uses=1]
+ %E = add i8 %D, 16 ; <i8> [#uses=1]
+ ret i8 %E
+}
+
+;; This is juse a zero extending shr.
+define i32 @test28(i32 %X) {
+ ;; Sign extend
+ %Y = ashr i32 %X, 24 ; <i32> [#uses=1]
+ ;; Mask out sign bits
+ %Z = and i32 %Y, 255 ; <i32> [#uses=1]
+ ret i32 %Z
+}
+
+define i32 @test29(i8 %X) {
+ %Y = zext i8 %X to i32 ; <i32> [#uses=1]
+ ;; Zero extend makes this unneeded.
+ %Z = and i32 %Y, 255 ; <i32> [#uses=1]
+ ret i32 %Z
+}
+
+define i32 @test30(i1 %X) {
+ %Y = zext i1 %X to i32 ; <i32> [#uses=1]
+ %Z = and i32 %Y, 1 ; <i32> [#uses=1]
+ ret i32 %Z
+}
+
+define i32 @test31(i1 %X) {
+ %Y = zext i1 %X to i32 ; <i32> [#uses=1]
+ %Z = shl i32 %Y, 4 ; <i32> [#uses=1]
+ %A = and i32 %Z, 16 ; <i32> [#uses=1]
+ ret i32 %A
+}
+
+define i32 @test32(i32 %In) {
+ %Y = and i32 %In, 16 ; <i32> [#uses=1]
+ %Z = lshr i32 %Y, 2 ; <i32> [#uses=1]
+ %A = and i32 %Z, 1 ; <i32> [#uses=1]
+ ret i32 %A
+}
+
+;; Code corresponding to one-bit bitfield ^1.
+define i32 @test33(i32 %b) {
+ %tmp.4.mask = and i32 %b, 1 ; <i32> [#uses=1]
+ %tmp.10 = xor i32 %tmp.4.mask, 1 ; <i32> [#uses=1]
+ %tmp.12 = and i32 %b, -2 ; <i32> [#uses=1]
+ %tmp.13 = or i32 %tmp.12, %tmp.10 ; <i32> [#uses=1]
+ ret i32 %tmp.13
+}
+
+define i32 @test34(i32 %A, i32 %B) {
+ %tmp.2 = or i32 %B, %A ; <i32> [#uses=1]
+ %tmp.4 = and i32 %tmp.2, %B ; <i32> [#uses=1]
+ ret i32 %tmp.4
+}
+
generated by cgit v1.1 at 2025-01-24 13:22:27 +0000