Subzero: Fix sext/zext lowering with i1 source operands.

tests_lit/llvm2ice_tests/64bit.pnacl.ll

 ; This tries to be a comprehensive test of i64 operations, in
 ; particular the patterns for lowering i64 operations into constituent
 ; i32 operations on x86-32.
 
 ; TODO(jvoung): fix extra "CALLTARGETS" run. The llvm-objdump symbolizer
 ; doesn't know how to symbolize non-section-local functions.
 ; The newer LLVM 3.6 one does work, but watch out for other bugs.
 
 ; RUN: %llvm2ice -O2 --verbose none %s \
 ; RUN:   | FileCheck --check-prefix=CALLTARGETS %s
@@ skipping 632 matching lines @@
   ret i64 %conv
 }
 ; CHECK-LABEL: sext8To64
 ; CHECK: movsx
 ; CHECK: sar {{.*}}, 31
 ;
 ; OPTM1-LABEL: sext8To64
 ; OPTM1: movsx
 ; OPTM1: sar {{.*}}, 31
 
+define internal i64 @sext1To64(i32 %a) {
+entry:
+  %a.arg_trunc = trunc i32 %a to i1
+  %conv = sext i1 %a.arg_trunc to i64
+  ret i64 %conv
+}
+; CHECK-LABEL: sext1To64
+; CHECK: mov
+; CHECK: shl {{.*}}, 31
+; CHECK: sar {{.*}}, 31
+; CHECK: sar {{.*}}, 31
+;
+; OPTM1-LABEL: sext1To64
+; OPTM1: mov
+; OPTM1: shl {{.*}}, 31
+; OPTM1: sar {{.*}}, 31
+; OPTM1: sar {{.*}}, 31
+
 define internal i64 @zext32To64(i32 %a) {
 entry:
   %conv = zext i32 %a to i64
   ret i64 %conv
 }
 ; CHECK-LABEL: zext32To64
 ; CHECK: mov
 ; CHECK: mov {{.*}}, 0
 ;
 ; OPTM1-LABEL: zext32To64
@@ skipping 28 matching lines @@
 ; OPTM1: movzx
 ; OPTM1: mov {{.*}}, 0
 
 define internal i64 @zext1To64(i32 %a) {
 entry:
   %a.arg_trunc = trunc i32 %a to i1
   %conv = zext i1 %a.arg_trunc to i64
   ret i64 %conv
 }
 ; CHECK-LABEL: zext1To64
-; CHECK: movzx
+; CHECK: and {{.*}}, 1
 ; CHECK: mov {{.*}}, 0
 ;
 ; OPTM1-LABEL: zext1To64
-; OPTM1: movzx
+; OPTM1: and {{.*}}, 1
 ; OPTM1: mov {{.*}}, 0
 
 define internal void @icmpEq64(i64 %a, i64 %b, i64 %c, i64 %d) {
 entry:
   %cmp = icmp eq i64 %a, %b
   br i1 %cmp, label %if.then, label %if.end
 
 if.then:                                          ; preds = %entry
   call void @func()
   br label %if.end
@@ skipping 577 matching lines @@
 }
 ; The following checks are not strictly necessary since one of the RUN
 ; lines actually runs the output through the assembler.
 ; CHECK-LABEL: icmpLt64Imm
 ; CHECK-NOT: cmp {{[0-9]+}},
 ; OPTM1-LABEL: icmpLt64Imm
 ; OPTM1-NOT: cmp {{[0-9]+}},
 
 ; ERRORS-NOT: ICE translation error
 ; DUMP-NOT: SZ